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This appendix provides the Digital NOTAM format for the abbreviations and acronyms included in ICAO Doc 8400 Abbreviations and codes, categorized in accordance with the following defined rules:

  1. Abbreviations that shall be spelled out and written in sentence case.
  2. Abbreviations and acronym that shall be kept and spelled in upper case.
  3. Abbreviations and acronyms that shall be kept and spelled in lower case.
  4. Acronyms that shall be spelled out and with the first letter of all words in upper case (except for words that correspond to an acronym or abbreviation for which another rule allows to be kept and spelled in upper case, such as RWY, THR etc.).
  5. Acronyms that shall be spelled out and then in lower case (except for the words that correspond to an acronym or abbreviation for which another rule allows to be kept and in upper case, such as RWY, THR, etc.).
  6. Symbols for units of measurement

It is recognized that not all of the listed abbreviations and acronyms will be used in Digital NOTAM, e.g. "wilco", However, the spelling rules for lower and upper case for all Doc 8400 entries are provided for completeness sake, with the exception of some meteorological terms such as cloud types and certain meteorological service message terms.

Abbreviation/acronym

Digital NOTAM format

Meaning

Rule

A/A

a/a

air-to-air

1st Case - abbreviations and acronyms kept, but spelled in lower case

A/G

a/g

air-to-ground

1st Case - abbreviations and acronyms kept, but spelled in lower case

ACCID

aircraft accident

notification of an aircraft accident

1st Case - abbreviations and acronyms kept, but spelled in lower case

ACFT

acft

aircraft

1st Case - abbreviations and acronyms kept, but spelled in lower case

ACK

ack

acknowledge

1st Case - abbreviations and acronyms kept, but spelled in lower case

ALTN

altn

alternate (aerodrome), alternating (light colour)

1st Case - abbreviations and acronyms kept, but spelled in lower case

APCH

apch

approach

1st Case - abbreviations and acronyms kept, but spelled in lower case

APRX

aprx

approximate or approximately

1st Case - abbreviations and acronyms kept, but spelled in lower case

ARR

arr

arrive or arrival

1st Case - abbreviations and acronyms kept, but spelled in lower case

ASAP

asap

as soon as possible

1st Case - abbreviations and acronyms kept, but spelled in lower case

ASPH

asph

asphalt

1st Case - abbreviations and acronyms kept, but spelled in lower case

ATTN

attn

attention

1st Case - abbreviations and acronyms kept, but spelled in lower case

AUTH

auth

authorized, authorization

1st Case - abbreviations and acronyms kept, but spelled in lower case

AUTO

auto

automatic

1st Case - abbreviations and acronyms kept, but spelled in lower case

AVGAS

avgas

aviation gasoline

1st Case - abbreviations and acronyms kept, but spelled in lower case

AZM

azm

azimuth

1st Case - abbreviations and acronyms kept, but spelled in lower case

BCN

bcn

beacon (aeronautical ground light)

1st Case - abbreviations and acronyms kept, but spelled in lower case

BDRY

bdry

boundary

1st Case - abbreviations and acronyms kept, but spelled in lower case

CHEM

chem

chemical

1st Case - abbreviations and acronyms kept, but spelled in lower case

COND

cond

condition

1st Case - abbreviations and acronyms kept, but spelled in lower case

CONT

cont

continue(s) , continued

1st Case - abbreviations and acronyms kept, but spelled in lower case

COOR

coor

coordinate, coordination

1st Case - abbreviations and acronyms kept, but spelled in lower case

COORD

coord

coordinates

1st Case - abbreviations and acronyms kept, but spelled in lower case

DCKG

dckg

docking

1st Case - abbreviations and acronyms kept, but spelled in lower case

DEST

dest

destination

1st Case - abbreviations and acronyms kept, but spelled in lower case

DIST

dist

distance

1st Case - abbreviations and acronyms kept, but spelled in lower case

ELEV

elev

elevation

1st Case - abbreviations and acronyms kept, but spelled in lower case

EQPT

eqpt

equipment

1st Case - abbreviations and acronyms kept, but spelled in lower case

EXTD

extd

extend or extending

1st Case - abbreviations and acronyms kept, but spelled in lower case

FAC

fac

facilities

1st Case - abbreviations and acronyms kept, but spelled in lower case

FAX

fax

facsimile transmission

1st Case - abbreviations and acronyms kept, but spelled in lower case

FCST

fcst

forecast

1st Case - abbreviations and acronyms kept, but spelled in lower case

FM

fm

from

1st Case - abbreviations and acronyms kept, but spelled in lower case

FREQ

freq

frequency

1st Case - abbreviations and acronyms kept, but spelled in lower case

FRNG

frng

firing

1st Case - abbreviations and acronyms kept, but spelled in lower case

G/A

g/a

ground-to-air

1st Case - abbreviations and acronyms kept, but spelled in lower case

G/A/G

g/a/g

ground-to-air and air-to-ground

1st Case - abbreviations and acronyms kept, but spelled in lower case

HEL

hel

helicopter

1st Case - abbreviations and acronyms kept, but spelled in lower case

HGT

hgt

height or height above

1st Case - abbreviations and acronyms kept, but spelled in lower case

IDENT

ident

identification

1st Case - abbreviations and acronyms kept, but spelled in lower case

INCORP

incorp

incorporated

1st Case - abbreviations and acronyms kept, but spelled in lower case

INFO

info

information

1st Case - abbreviations and acronyms kept, but spelled in lower case

INOP

inop

inoperative

1st Case - abbreviations and acronyms kept, but spelled in lower case

INSTR

instr

instrument

1st Case - abbreviations and acronyms kept, but spelled in lower case

INTL

intl

international

1st Case - abbreviations and acronyms kept, but spelled in lower case

LAT

lat

latitude

1st Case - abbreviations and acronyms kept, but spelled in lower case

LDG

ldg

landing

1st Case - abbreviations and acronyms kept, but spelled in lower case

LONG

long

longitude

1st Case - abbreviations and acronyms kept, but spelled in lower case

MAINT

maint

maintenance

1st Case - abbreviations and acronyms kept, but spelled in lower case

MAX

max

maximum

1st Case - abbreviations and acronyms kept, but spelled in lower case

MNM

mnm

minimum

1st Case - abbreviations and acronyms kept, but spelled in lower case

MOV

mov

move , moving, movement

1st Case - abbreviations and acronyms kept, but spelled in lower case

MPS

mps

metres per second

1st Case - abbreviations and acronyms kept, but spelled in lower case

MSG

msg

message

1st Case - abbreviations and acronyms kept, but spelled in lower case

NAV

nav

navigation

1st Case - abbreviations and acronyms kept, but spelled in lower case

NAVAID

navaid

navigation aid

1st Case - abbreviations and acronyms kept, but spelled in lower case

NONSTD

nonstd

non-standard

1st Case - abbreviations and acronyms kept, but spelled in lower case

NOSIG

nosig

no significant change

1st Case - abbreviations and acronyms kept, but spelled in lower case

NR

nr

number

1st Case - abbreviations and acronyms kept, but spelled in lower case

NTL

ntl

national

1st Case - abbreviations and acronyms kept, but spelled in lower case

O/R

o/r

on request

1st Case - abbreviations and acronyms kept, but spelled in lower case

OBS

obs

observe, observed, observation

1st Case - abbreviations and acronyms kept, but spelled in lower case

OBST

obst

obstacle

1st Case - abbreviations and acronyms kept, but spelled in lower case

OPS

ops

operations

1st Case - abbreviations and acronyms kept, but spelled in lower case

PAX

pax

passenger(s)

1st Case - abbreviations and acronyms kept, but spelled in lower case

PERM

perm

permanent

1st Case - abbreviations and acronyms kept, but spelled in lower case

PROB

prob

probability

1st Case - abbreviations and acronyms kept, but spelled in lower case

PROC

proc

procedure

1st Case - abbreviations and acronyms kept, but spelled in lower case

PROP

prop

propeller

1st Case - abbreviations and acronyms kept, but spelled in lower case

PWR

pwr

power

1st Case - abbreviations and acronyms kept, but spelled in lower case

REF

ref

reference to, refer to

1st Case - abbreviations and acronyms kept, but spelled in lower case

REG

reg

registration

1st Case - abbreviations and acronyms kept, but spelled in lower case

REP

rep

report, reporting, reporting point

1st Case - abbreviations and acronyms kept, but spelled in lower case

REQ

req

request, requested

1st Case - abbreviations and acronyms kept, but spelled in lower case

RMK

rmk

remark

1st Case - abbreviations and acronyms kept, but spelled in lower case

RTE

rte

route

1st Case - abbreviations and acronyms kept, but spelled in lower case

SIG

sig

significant

1st Case - abbreviations and acronyms kept, but spelled in lower case

STN

stn

station

1st Case - abbreviations and acronyms kept, but spelled in lower case

STS

sts

status

1st Case - abbreviations and acronyms kept, but spelled in lower case

SUBJ

subj

subject to

1st Case - abbreviations and acronyms kept, but spelled in lower case

TEL

tel

telephone

1st Case - abbreviations and acronyms kept, but spelled in lower case

TEMPO

tempo

temporary, temporarily

1st Case - abbreviations and acronyms kept, but spelled in lower case

TFC

tfc

traffic

1st Case - abbreviations and acronyms kept, but spelled in lower case

TGL

tgl

touch-and-go landing

1st Case - abbreviations and acronyms kept, but spelled in lower case

TKOF

tkof

take-off

1st Case - abbreviations and acronyms kept, but spelled in lower case

TLOF

tlof

touchdown and lift-off area

1st Case - abbreviations and acronyms kept, but spelled in lower case

TURB

turb

turbulence

1st Case - abbreviations and acronyms kept, but spelled in lower case

UFN

ufn

until further notice

1st Case - abbreviations and acronyms kept, but spelled in lower case

VOL

vol

volume (followed by I, II...)

1st Case - abbreviations and acronyms kept, but spelled in lower case

VRB

vrb

variable

1st Case - abbreviations and acronyms kept, but spelled in lower case

WDI

wdi

wind direction indicator

1st Case - abbreviations and acronyms kept, but spelled in lower case

WEF

wef

with efffect from

1st Case - abbreviations and acronyms kept, but spelled in lower case

WIE

wie

with immediate effect

1st Case - abbreviations and acronyms kept, but spelled in lower case

WILCO

wilco

will comply

1st Case - abbreviations and acronyms kept, but spelled in lower case

WIP

wip

work in progress

1st Case - abbreviations and acronyms kept, but spelled in lower case

WRNG

wrng

warning

1st Case - abbreviations and acronyms kept, but spelled in lower case

WWW

www

worldwide web

1st Case - abbreviations and acronyms kept, but spelled in lower case

YR

yr

your

1st Case - abbreviations and acronyms kept, but spelled in lower case

ABN

ABN

Aerodrome Beacon

2nd Case - abbreviations and acronyms kept, spelled in upper case

ACARS

ACARS

Aircraft communication addressing and reporting system

2nd Case - abbreviations and acronyms kept, spelled in upper case

ACAS

ACAS

Airborne collision avoidance system

2nd Case - abbreviations and acronyms kept, spelled in upper case

ACC

ACC

Area Control Center

2nd Case - abbreviations and acronyms kept, spelled in upper case

ACL

ACL

Altimeter check location

2nd Case - abbreviations and acronyms kept, spelled in upper case

ACN

ACN

Aircraft classification number

2nd Case - abbreviations and acronyms kept, spelled in upper case

AD

AD

Aerodrome

2nd Case - abbreviations and acronyms kept, spelled in upper case

ADF

ADF

Automatic Direction-Finding Equipment

2nd Case - abbreviations and acronyms kept, spelled in upper case

ADIZ

ADIZ

Air Defence Identification Code

2nd Case - abbreviations and acronyms kept, spelled in upper case

ADS-B

ADS-B

Automatic Dependent Surveillance - Broadcast

2nd Case - abbreviations and acronyms kept, spelled in upper case

ADS-C

ADS-C

Automatic Dependent Surveillance - Contract

2nd Case - abbreviations and acronyms kept, spelled in upper case

ADSU

ADSU

Automatic Dependent Surveillance Unit

2nd Case - abbreviations and acronyms kept, spelled in upper case

AFIL

AFIL

Flight Plan Filed in the Air

2nd Case - abbreviations and acronyms kept, spelled in upper case

AFIS

AFIS

Aerodrome Flight Information Service

2nd Case - abbreviations and acronyms kept, spelled in upper case

AFTN

AFTN

Aeronautical Fixed Telecommunication Network

2nd Case - abbreviations and acronyms kept, spelled in upper case

AGA

AGA

Aerodromes, Air Routes and Ground Aids

2nd Case - abbreviations and acronyms kept, spelled in upper case

AGL

AGL

Above Ground Level

2nd Case - abbreviations and acronyms kept, spelled in upper case

AIC

AIC

Aeronautical Information Circular

2nd Case - abbreviations and acronyms kept, spelled in upper case

AIP

AIP

Aeronautical Information Publication

2nd Case - abbreviations and acronyms kept, spelled in upper case

AIRAC

AIRAC

Aeronautical Information Regulation and Control

2nd Case - abbreviations and acronyms kept, spelled in upper case

AIRMET

AIRMET

Information concerning en-route weather phenomena which may affect the safety of low-level aircraft operations

2nd Case - abbreviations and acronyms kept, spelled in upper case

AIS

AIS

Aeronautical Information Services

2nd Case - abbreviations and acronyms kept, spelled in upper case

ALERFA

ALERFA

Alert Phase

2nd Case - abbreviations and acronyms kept, spelled in upper case

ALT

ALT

Altitude

2nd Case - abbreviations and acronyms kept, spelled in upper case

AMDTAMDTAmendment (AIP Amendment)2nd Case - abbreviations and acronyms kept, spelled in upper case

AMSL

AMSL

Above Mean Sea Level

2nd Case - abbreviations and acronyms kept, spelled in upper case

ANC

ANC

Aeronautical Chart - 1:500.000 (followed by name/title)

2nd Case - abbreviations and acronyms kept, spelled in upper case

ANCS

ANCS

Aeronautical Navigation Chart - Small Scale (followed by name/title and scale)

2nd Case - abbreviations and acronyms kept, spelled in upper case

AO

AO

Aircraft operator

2nd Case - abbreviations and acronyms kept, spelled in upper case

AOC

AOC

Aerodrome obstacle chart (followed by name/title)

2nd Case - abbreviations and acronyms kept, spelled in upper case

APAPI

APAPI

(to be pronounced "AY-PAPI")Abbreviated Precision Approach Path Indicator

2nd Case - abbreviations and acronyms kept, spelled in upper case

APDC

APDC

Aircraft parking/docking chart (followed by name/title)

2nd Case - abbreviations and acronyms kept, spelled in upper case

APP

APP

Approach Control Office OR Approach Control OR Approach Control Service

2nd Case - abbreviations and acronyms kept, spelled in upper case

APR

APR

April

2nd Case - abbreviations and acronyms kept, spelled in upper case

APU

APU

Auxiliary power unit

2nd Case - abbreviations and acronyms kept, spelled in upper case

APV

APV

Approach Procedure with Vertical guidance

2nd Case - abbreviations and acronyms kept, spelled in upper case

ARO

ARO

Air traffic services reporting office

2nd Case - abbreviations and acronyms kept, spelled in upper case

ARP

ARP

Aerodrome Reference Point

2nd Case - abbreviations and acronyms kept, spelled in upper case

ASDA

ASDA

Accelerate-Stop Distance Available

2nd Case - abbreviations and acronyms kept, spelled in upper case

ASHTAM

ASHTAM

ASHTAM

2nd Case - abbreviations and acronyms kept, spelled in upper case

ATA

ATA

Actual Time of Arrival

2nd Case - abbreviations and acronyms kept, spelled in upper case

ATC

ATC

Air Traffic Control (in general)

2nd Case - abbreviations and acronyms kept, spelled in upper case

ATD

ATD

Actual Time of Departure

2nd Case - abbreviations and acronyms kept, spelled in upper case

ATFM

ATFM

Air Traffic Flow Management

2nd Case - abbreviations and acronyms kept, spelled in upper case

ATIS

ATIS

Automatic Terminal Information Service

2nd Case - abbreviations and acronyms kept, spelled in upper case

ATM

ATM

Air Traffic Management

2nd Case - abbreviations and acronyms kept, spelled in upper case

ATN

ATN

Aeronautical Telecommunication Network

2nd Case - abbreviations and acronyms kept, spelled in upper case

ATS

ATS

Air Traffic Services

2nd Case - abbreviations and acronyms kept, spelled in upper case

AT-VASIS

AT-VASIS

AT Visual Approach Slope Indicator System

2nd Case - abbreviations and acronyms kept, spelled in upper case

ATZ

ATZ

Aerodrome Traffic Zone

2nd Case - abbreviations and acronyms kept, spelled in upper case

AUG

AUG

August

2nd Case - abbreviations and acronyms kept, spelled in upper case

AWOS

AWOS

Automated Weather Observation System

2nd Case - abbreviations and acronyms kept, spelled in upper case

AWY

AWY

Airway

2nd Case - abbreviations and acronyms kept, spelled in upper case

BARO-VNAV

BARO-VNAV

Barometric vertical navigation

2nd Case - abbreviations and acronyms kept, spelled in upper case

BRG

BRG

Bearing

2nd Case - abbreviations and acronyms kept, spelled in upper case

C

C

Centre (preceded by runway designation number to identify a parallel RWY)

2nd Case - abbreviations and acronyms kept, spelled in upper case

C

C

Degrees Celsius (Centigrade)

2nd Case - abbreviations and acronyms kept, spelled in upper case

CAA

CAA

Civil Aviation Authority or Civil Aviation Administration

2nd Case - abbreviations and acronyms kept, spelled in upper case

CAT

CAT

Category

2nd Case - abbreviations and acronyms kept, spelled in upper case

CAVOK

CAVOK

Visibility, cloud and present weather better than prescribed values or conditions

2nd Case - abbreviations and acronyms kept, spelled in upper case

CDR

CDR

Conditional route

2nd Case - abbreviations and acronyms kept, spelled in upper case

CH

CH

Channel

2nd Case - abbreviations and acronyms kept, spelled in upper case

CIDIN

CIDIN

Common ICAO Data Interchange Network

2nd Case - abbreviations and acronyms kept, spelled in upper case

CNS

CNS

Communications, Navigation and Surveillance

2nd Case - abbreviations and acronyms kept, spelled in upper case

COM

COM

Communications

2nd Case - abbreviations and acronyms kept, spelled in upper case

CPDLC

CPDLC

Controller-Pilot Data Link Communications

2nd Case - abbreviations and acronyms kept, spelled in upper case

CS

CS

Call sign

2nd Case - abbreviations and acronyms kept, spelled in upper case

CTA

CTA

Control Area

2nd Case - abbreviations and acronyms kept, spelled in upper case

CTR

CTR

Control Zone

2nd Case - abbreviations and acronyms kept, spelled in upper case

CWY

CWY

Clearway

2nd Case - abbreviations and acronyms kept, spelled in upper case

D....

D....

Danger area (followed by Identification)

2nd Case - abbreviations and acronyms kept, spelled in upper case

DA

DA

Decision Altitude

2nd Case - abbreviations and acronyms kept, spelled in upper case

D-ATIS

D-ATIS

Data Link Automatic Terminal Information Service

2nd Case - abbreviations and acronyms kept, spelled in upper case

DCT

DCT

Direct

2nd Case - abbreviations and acronyms kept, spelled in upper case

DEC

DEC

December

2nd Case - abbreviations and acronyms kept, spelled in upper case

DEG

DEG

Degrees

2nd Case - abbreviations and acronyms kept, spelled in upper case

DEP

DEP

Departure (message type designator)

2nd Case - abbreviations and acronyms kept, spelled in upper case

DETRESFA

DETRESFA

Distress Phase

2nd Case - abbreviations and acronyms kept, spelled in upper case

DF

DF

Direction Finding

2nd Case - abbreviations and acronyms kept, spelled in upper case

DH

DH

Decision Height

2nd Case - abbreviations and acronyms kept, spelled in upper case

DLA

DLA

Delay (message type designator)

2nd Case - abbreviations and acronyms kept, spelled in upper case

DME

DME

Distance Measuring Equipment

2nd Case - abbreviations and acronyms kept, spelled in upper case

D-VOLMET

D-VOLMET

Data Link VOLMET

2nd Case - abbreviations and acronyms kept, spelled in upper case

DVOR

DVOR

Doppler VOR

2nd Case - abbreviations and acronyms kept, spelled in upper case

E

E

Eastern Longitude

2nd Case - abbreviations and acronyms kept, spelled in upper case

EGNOS

EGNOS

European Geostationary Navigation Overlay Service

2nd Case - abbreviations and acronyms kept, spelled in upper case

EHF

EHF

Extremely High Frequency (30000 to 300000 MHz)

2nd Case - abbreviations and acronyms kept, spelled in upper case

ELBA

ELBA

Emergency Location Beacon - Aircraft

2nd Case - abbreviations and acronyms kept, spelled in upper case

ELT

ELT

Emergency Locator Transmitter

2nd Case - abbreviations and acronyms kept, spelled in upper case

EMERG

EMERG

Emergency

2nd Case - abbreviations and acronyms kept, spelled in upper case

ENR

ENR

En route

2nd Case - abbreviations and acronyms kept, spelled in upper case

ENRC

ENRC

Enroute chart (followed by name/title)

2nd Case - abbreviations and acronyms kept, spelled in upper case

EOBT

EOBT

Estimated Off-Block Time

2nd Case - abbreviations and acronyms kept, spelled in upper case

EST

EST

Estimate OR Estimated OR Estimation (message type designator)

2nd Case - abbreviations and acronyms kept, spelled in upper case

ETA

ETA

Estimated Time of Arrival OR Estimating Arrival

2nd Case - abbreviations and acronyms kept, spelled in upper case

ETD

ETD

Estimated Time of Departure OR Estimating Departure

2nd Case - abbreviations and acronyms kept, spelled in upper case

ETO

ETO

Estimated Time Over Significant Point

2nd Case - abbreviations and acronyms kept, spelled in upper case

FA

FA

Course from a fix to an altitude

2nd Case - abbreviations and acronyms kept, spelled in upper case

FAF

FAF

Final Approach Fix

2nd Case - abbreviations and acronyms kept, spelled in upper case

FAL

FAL

Facilitation of International Air Transport

2nd Case - abbreviations and acronyms kept, spelled in upper case

FAP

FAP

Final Approach Point

2nd Case - abbreviations and acronyms kept, spelled in upper case

FAS

FAS

Final Approach Segment

2nd Case - abbreviations and acronyms kept, spelled in upper case

FATO

FATO

Final Approach and Take-off Area

2nd Case - abbreviations and acronyms kept, spelled in upper case

FEB

FEB

February

2nd Case - abbreviations and acronyms kept, spelled in upper case

FIC

FIC

Flight Information Centre

2nd Case - abbreviations and acronyms kept, spelled in upper case

FIR

FIR

Flight Information Region

2nd Case - abbreviations and acronyms kept, spelled in upper case

FIS

FIS

Flight Information Service

2nd Case - abbreviations and acronyms kept, spelled in upper case

FL

FL

Flight Level

2nd Case - abbreviations and acronyms kept, spelled in upper case

FLG

FLG

Flashing

2nd Case - abbreviations and acronyms kept, spelled in upper case

FPL

FPL

Flight Plan

2nd Case - abbreviations and acronyms kept, spelled in upper case

FRI

FRI

Friday

2nd Case - abbreviations and acronyms kept, spelled in upper case

GA

GA

General Aviation

2nd Case - abbreviations and acronyms kept, spelled in upper case

GAGAN

GAGAN

GPS & Geostationary Earth Orbit Augmented Navigation

2nd Case - abbreviations and acronyms kept, spelled in upper case

GBAS

GBAS

Ground Based Augmentation System

2nd Case - abbreviations and acronyms kept, spelled in upper case

GEN

GEN

General

2nd Case - abbreviations and acronyms kept, spelled in upper case

GEO

GEO

Geographic OR True

2nd Case - abbreviations and acronyms kept, spelled in upper case

GLONAS

GLONAS

Global Orbiting Navigation Satellite System (to be pronounced "GLO-NAS")

2nd Case - abbreviations and acronyms kept, spelled in upper case

GND

GND

Ground

2nd Case - abbreviations and acronyms kept, spelled in upper case

GNSS

GNSS

Global Navigation Satellite System

2nd Case - abbreviations and acronyms kept, spelled in upper case

GOV

GOV

Government

2nd Case - abbreviations and acronyms kept, spelled in upper case

GP

GP

Glide Path

2nd Case - abbreviations and acronyms kept, spelled in upper case

GPS

GPS

Global Positioning System

2nd Case - abbreviations and acronyms kept, spelled in upper case

GS

GS

Ground Speed

2nd Case - abbreviations and acronyms kept, spelled in upper case

H24

H24

Continuous Day and Night Service

2nd Case - abbreviations and acronyms kept, spelled in upper case

HAPI

HAPI

Helicopter Approach Path Indicator

2nd Case - abbreviations and acronyms kept, spelled in upper case

HDF

HDF

High Frequency Direction-Finding Station

2nd Case - abbreviations and acronyms kept, spelled in upper case

HDG

HDG

Heading

2nd Case - abbreviations and acronyms kept, spelled in upper case

HF

HF

High Frequency [3000 to 30000 kHz]

2nd Case - abbreviations and acronyms kept, spelled in upper case

HJ

HJ

Sunrise to sunset

2nd Case - abbreviations and acronyms kept, spelled in upper case

HN

HN

Sunset to Sunrise

2nd Case - abbreviations and acronyms kept, spelled in upper case

HO

HO

Service available to meet operational requirements

2nd Case - abbreviations and acronyms kept, spelled in upper case

HOL

HOL

Holiday

2nd Case - abbreviations and acronyms kept, spelled in upper case

HOSP

HOSP

Hospital Aircraft

2nd Case - abbreviations and acronyms kept, spelled in upper case

HS

HS

Service Available During Hours of Scheduled Operations

2nd Case - abbreviations and acronyms kept, spelled in upper case

HUM

HUM

Humanitarian

2nd Case - abbreviations and acronyms kept, spelled in upper case

HVDF

HVDF

High and Very High Frequency Direction Finding Stations (At the Same Location)

2nd Case - abbreviations and acronyms kept, spelled in upper case

HX

HX

No Specific Working Hours

2nd Case - abbreviations and acronyms kept, spelled in upper case

IAC

IAC

Instrument Approach Chart (followed by name/title)

2nd Case - abbreviations and acronyms kept, spelled in upper case

IAF

IAF

Initial Approach Fix

2nd Case - abbreviations and acronyms kept, spelled in upper case

IAP

IAP

Instrument Approach Procedure

2nd Case - abbreviations and acronyms kept, spelled in upper case

IAS

IAS

Indicated Air Speed

2nd Case - abbreviations and acronyms kept, spelled in upper case

ICAO

ICAO

International Civil Aviation Organization

2nd Case - abbreviations and acronyms kept, spelled in upper case

ID

ID

Identifier OR Identify

2nd Case - abbreviations and acronyms kept, spelled in upper case

IF

IF

Intermediate Approach Fix

2nd Case - abbreviations and acronyms kept, spelled in upper case

IFR

IFR

Instrument Flight Rules

2nd Case - abbreviations and acronyms kept, spelled in upper case

ILS

ILS

Instrument Landing System

2nd Case - abbreviations and acronyms kept, spelled in upper case

IM

IM

Inner marker

2nd Case - abbreviations and acronyms kept, spelled in upper case

IMC

IMC

Instrument Meteorological Conditions

2nd Case - abbreviations and acronyms kept, spelled in upper case

INCERFA

INCERFA

Uncertainty Phase

2nd Case - abbreviations and acronyms kept, spelled in upper case

INS

INS

Inertial Navigation System

2nd Case - abbreviations and acronyms kept, spelled in upper case

IRS

IRS

Inertial reference system

2nd Case - abbreviations and acronyms kept, spelled in upper case

ISA

ISA

International Standard Atmosphere

2nd Case - abbreviations and acronyms kept, spelled in upper case

JAN

JAN

January

2nd Case - abbreviations and acronyms kept, spelled in upper case

JUL

JUL

July

2nd Case - abbreviations and acronyms kept, spelled in upper case

JUN

JUN

June

2nd Case - abbreviations and acronyms kept, spelled in upper case

KIAS

KIAS

Knots indicated airspeed

2nd Case - abbreviations and acronyms kept, spelled in upper case

L

L

Left (preceded by runway designation number to identify a parallel runway)

2nd Case - abbreviations and acronyms kept, spelled in upper case

L

L

Locator (See LM, LO)

2nd Case - abbreviations and acronyms kept, spelled in upper case

LDA

LDA

Landing Distance Available

2nd Case - abbreviations and acronyms kept, spelled in upper case

LDAH

LDAH

Landing Distance Available, Helicopter

2nd Case - abbreviations and acronyms kept, spelled in upper case

LDI

LDI

Landing Direction Indicator

2nd Case - abbreviations and acronyms kept, spelled in upper case

LF

LF

Low Frequency (30 to 300 kHz)

2nd Case - abbreviations and acronyms kept, spelled in upper case

LIH

LIH

Light Intensity High

2nd Case - abbreviations and acronyms kept, spelled in upper case

LIL

LIL

Light Intensity Low

2nd Case - abbreviations and acronyms kept, spelled in upper case

LIM

LIM

Light Intensity Medium

2nd Case - abbreviations and acronyms kept, spelled in upper case

LM

LM

Locator, Middle

2nd Case - abbreviations and acronyms kept, spelled in upper case

LNAV

LNAV

Lateral Navigation (to be pronounced "EL-NAV")

2nd Case - abbreviations and acronyms kept, spelled in upper case

LO

LO

Locator, Outer

2nd Case - abbreviations and acronyms kept, spelled in upper case

LOC

LOC

Localizer

2nd Case - abbreviations and acronyms kept, spelled in upper case

LORAN

LORAN

LORAN (Long Range Air Navigation System)

2nd Case - abbreviations and acronyms kept, spelled in upper case

LPV

LPV

Localizer Performance with Vertical Guidance

2nd Case - abbreviations and acronyms kept, spelled in upper case

LVP

LVP

Low Visibility Procedures

2nd Case - abbreviations and acronyms kept, spelled in upper case

M

M

Mach Number (Followed by figures)

2nd Case - abbreviations and acronyms kept, spelled in upper case

MAG

MAG

Magnetic

2nd Case - abbreviations and acronyms kept, spelled in upper case

MAP

MAP

Aeronautical maps and charts

2nd Case - abbreviations and acronyms kept, spelled in upper case

MAPT

MAPT

Missed Approach Point

2nd Case - abbreviations and acronyms kept, spelled in upper case

MAR

MAR

March

2nd Case - abbreviations and acronyms kept, spelled in upper case

MATZ

MATZ

Military Aerodrome Traffic Zone

2nd Case - abbreviations and acronyms kept, spelled in upper case

MAY

MAY

May

2nd Case - abbreviations and acronyms kept, spelled in upper case

MCTR

MCTR

Military Control Zone

2nd Case - abbreviations and acronyms kept, spelled in upper case

MDA

MDA

Minimum Descent Altitude

2nd Case - abbreviations and acronyms kept, spelled in upper case

MDH

MDH

Minimum Descent Height

2nd Case - abbreviations and acronyms kept, spelled in upper case

MEDEVAC

MEDEVAC

Medical Evacuation Flight

2nd Case - abbreviations and acronyms kept, spelled in upper case

MEHT

MEHT

Minimum Eye Height over Threshold (For VASIS and PAPI)

2nd Case - abbreviations and acronyms kept, spelled in upper case

MET

MET

Meteorological OR Meteorology

2nd Case - abbreviations and acronyms kept, spelled in upper case

METAR

METAR

Aerodrome routine meteorological report

2nd Case - abbreviations and acronyms kept, spelled in upper case

MF

MF

Medium Frequency (300 to 3000 kHz)

2nd Case - abbreviations and acronyms kept, spelled in upper case

MIL

MIL

Military

2nd Case - abbreviations and acronyms kept, spelled in upper case

MKR

MKR

Marker radio beacon

2nd Case - abbreviations and acronyms kept, spelled in upper case

MLS

MLS

Microwave Landing System

2nd Case - abbreviations and acronyms kept, spelled in upper case

MM

MM

Middle Marker

2nd Case - abbreviations and acronyms kept, spelled in upper case

MOA

MOA

Military Operating Area

2nd Case - abbreviations and acronyms kept, spelled in upper case

MOC

MOC

Minimum Obstacle Clearance (required)

2nd Case - abbreviations and acronyms kept, spelled in upper case

MON

MON

Monday

2nd Case - abbreviations and acronyms kept, spelled in upper case

MSL

MSL

Mean Sea Level

2nd Case - abbreviations and acronyms kept, spelled in upper case

MSSR

MSSR

Monopulse Secondary Surveillance Radar

2nd Case - abbreviations and acronyms kept, spelled in upper case

MWO

MWO

Meteorological Watch Office

2nd Case - abbreviations and acronyms kept, spelled in upper case

NAT

NAT

North Atlantic

2nd Case - abbreviations and acronyms kept, spelled in upper case

NDB

NDB

Non-Directional Radio Beacon

2nd Case - abbreviations and acronyms kept, spelled in upper case

NIL

NIL

None OR I Have nothing to send to you

2nd Case - abbreviations and acronyms kept, spelled in upper case

NOF

NOF

International NOTAM Office

2nd Case - abbreviations and acronyms kept, spelled in upper case

NOTAM

NOTAM

Notice To Airmen

2nd Case - abbreviations and acronyms kept, spelled in upper case

NOTAMC

NOTAMC

Cancelling NOTAM

2nd Case - abbreviations and acronyms kept, spelled in upper case

NOTAMN

NOTAMN

New NOTAM

2nd Case - abbreviations and acronyms kept, spelled in upper case

NOTAMR

NOTAMR

Replacing NOTAM

2nd Case - abbreviations and acronyms kept, spelled in upper case

NOV

NOV

November

2nd Case - abbreviations and acronyms kept, spelled in upper case

NPA

NPA

Non-precision approach

2nd Case - abbreviations and acronyms kept, spelled in upper case

OAC

OAC

Oceanic Area Control Centre

2nd Case - abbreviations and acronyms kept, spelled in upper case

OCA

OCA

Obstacle Clearance Altitude

2nd Case - abbreviations and acronyms kept, spelled in upper case

OCH

OCH

Obstacle Clearance Height

2nd Case - abbreviations and acronyms kept, spelled in upper case

OCT

OCT

October

2nd Case - abbreviations and acronyms kept, spelled in upper case

OLDI

OLDI

On-Line Data Interchange

2nd Case - abbreviations and acronyms kept, spelled in upper case

OM

OM

Outer Marker

2nd Case - abbreviations and acronyms kept, spelled in upper case

OPMET

OPMET

Operational Meteorological (information)

2nd Case - abbreviations and acronyms kept, spelled in upper case

P...

P...

Prohibited area (followed by identification)

2nd Case - abbreviations and acronyms kept, spelled in upper case

PANS

PANS

Procedures for Air Navigation Services

2nd Case - abbreviations and acronyms kept, spelled in upper case

PAPI

PAPI

Precision Approach Path Indicator

2nd Case - abbreviations and acronyms kept, spelled in upper case

PAR

PAR

Precision Approach Radar

2nd Case - abbreviations and acronyms kept, spelled in upper case

PATC

PATC

Precision Approach Terrain Chart (followed by name/title)

2nd Case - abbreviations and acronyms kept, spelled in upper case

PBN

PBN

Performance-based navigation

2nd Case - abbreviations and acronyms kept, spelled in upper case

PCN

PCN

Pavement Classification Number

2nd Case - abbreviations and acronyms kept, spelled in upper case

PIB

PIB

Pre-flight Information Bulletin

2nd Case - abbreviations and acronyms kept, spelled in upper case

PPR

PPR

Prior Permission Required

2nd Case - abbreviations and acronyms kept, spelled in upper case

PSR

PSR

Primary Surveillance Radar

2nd Case - abbreviations and acronyms kept, spelled in upper case

QDM

QDM

Magnetic Heading (zero wind)

2nd Case - abbreviations and acronyms kept, spelled in upper case

QDR

QDR

Magnetic Bearing

2nd Case - abbreviations and acronyms kept, spelled in upper case

QFE

QFE

Atmospheric pressure at aerodrome elevation (OR at runway threshold)

2nd Case - abbreviations and acronyms kept, spelled in upper case

QNH

QNH

Altimeter sub-scale setting to obtain elevation when on the ground

2nd Case - abbreviations and acronyms kept, spelled in upper case

QTE

QTE

True bearing

2nd Case - abbreviations and acronyms kept, spelled in upper case

R...

R...

Restricted area (followed by identification)

2nd Case - abbreviations and acronyms kept, spelled in upper case

R

R

Right (preceded by runway designation number to identify a parallel runway)

2nd Case - abbreviations and acronyms kept, spelled in upper case

R-NNN

R-nnn

Radial from VOR (followed by three figures)

2nd Case - abbreviations and acronyms kept, spelled in upper case

RAC

RAC

Rules of the Air and Air Traffic Services

2nd Case - abbreviations and acronyms kept, spelled in upper case

RAIM

RAIM

Receiver Autonomous Integrity Monitoring

2nd Case - abbreviations and acronyms kept, spelled in upper case

RCC

RCC

Rescue Co-ordination Centre

2nd Case - abbreviations and acronyms kept, spelled in upper case

RDH

RDH

Reference Datum Height

2nd Case - abbreviations and acronyms kept, spelled in upper case

RESA

RESA

Runway End Safety Area

2nd Case - abbreviations and acronyms kept, spelled in upper case

RNAV

RNAV

Area Navigation (to be pronounced "AR-NAV")

2nd Case - abbreviations and acronyms kept, spelled in upper case

RNP

RNP

Required Navigation Performance

2nd Case - abbreviations and acronyms kept, spelled in upper case

RPL

RPL

Repetitive flight plan

2nd Case - abbreviations and acronyms kept, spelled in upper case

RQP

RQP

Request flight plan (message type designator)

2nd Case - abbreviations and acronyms kept, spelled in upper case

RQS

RQS

Request supplementary flight plan (message type designator)

2nd Case - abbreviations and acronyms kept, spelled in upper case

RSR

RSR

En-Route Surveillance Radar

2nd Case - abbreviations and acronyms kept, spelled in upper case

RVR

RVR

Runway Visual Range

2nd Case - abbreviations and acronyms kept, spelled in upper case

RVSM

RVSM

Reduced Vertical Separation Minimum

2nd Case - abbreviations and acronyms kept, spelled in upper case

RWY

RWY

Runway

2nd Case - abbreviations and acronyms kept, spelled in upper case

SAR

SAR

Search and Rescue

2nd Case - abbreviations and acronyms kept, spelled in upper case

SARPS

SARPS

Standards and Recommended Practices ICAO

2nd Case - abbreviations and acronyms kept, spelled in upper case

SAT

SAT

Saturday

2nd Case - abbreviations and acronyms kept, spelled in upper case

SATCOM

SATCOM

Satellite Communication

2nd Case - abbreviations and acronyms kept, spelled in upper case

SBAS

SBAS

Satellite Based Augmentation System (to be pronounced "ESS-BAS")

2nd Case - abbreviations and acronyms kept, spelled in upper case

SELCAL

SELCAL

Selective calling system

2nd Case - abbreviations and acronyms kept, spelled in upper case

SEP

SEP

September

2nd Case - abbreviations and acronyms kept, spelled in upper case

SFC

SFC

Surface

2nd Case - abbreviations and acronyms kept, spelled in upper case

SHF

SHF

Super High Frequency (3000 to 30000 MHz)

2nd Case - abbreviations and acronyms kept, spelled in upper case

SI

SI

International system of units

2nd Case - abbreviations and acronyms kept, spelled in upper case

SID

SID

Standard Instrument Departure

2nd Case - abbreviations and acronyms kept, spelled in upper case

SIGMET

SIGMET

Information concerning en-route weather phenomena which may affect the safety of aircraft operations

2nd Case - abbreviations and acronyms kept, spelled in upper case

SNOWTAM

SNOWTAM

 SNOWTAM

2nd Case - abbreviations and acronyms kept, spelled in upper case

SR

SR

Sunrise

2nd Case - abbreviations and acronyms kept, spelled in upper case

SRA

SRA

Surveillance Radar Approach

2nd Case - abbreviations and acronyms kept, spelled in upper case

SRE

SRE

Surveillance Radar Element of precision approach radar system

2nd Case - abbreviations and acronyms kept, spelled in upper case

SS

SS

Sunset

2nd Case - abbreviations and acronyms kept, spelled in upper case

SSR

SSR

Secondary Surveillance Radar

2nd Case - abbreviations and acronyms kept, spelled in upper case

STAR

STAR

Standard instrument arrival

2nd Case - abbreviations and acronyms kept, spelled in upper case

STD

STD

Standard

2nd Case - abbreviations and acronyms kept, spelled in upper case

SUN

SUN

Sunday

2nd Case - abbreviations and acronyms kept, spelled in upper case

SUP

SUP

Supplement (AIP Supplement)

2nd Case - abbreviations and acronyms kept, spelled in upper case

SUPPS

SUPPS

Regional supplementary procedures

2nd Case - abbreviations and acronyms kept, spelled in upper case

SWY

SWY

Stop way

2nd Case - abbreviations and acronyms kept, spelled in upper case

TA

TA

Transition Altitude

2nd Case - abbreviations and acronyms kept, spelled in upper case

TA/H

TA/H

Turn at an altitude/height

2nd Case - abbreviations and acronyms kept, spelled in upper case

TACAN

TACAN

UHF Tactical Air Navigation Aid

2nd Case - abbreviations and acronyms kept, spelled in upper case

TAF

TAF

Aerodrome forecast

2nd Case - abbreviations and acronyms kept, spelled in upper case

TAR

TAR

Terminal Area Surveillance Radar

2nd Case - abbreviations and acronyms kept, spelled in upper case

TAS

TAS

True Airspeed

2nd Case - abbreviations and acronyms kept, spelled in upper case

TCASRA

TCASRA

Traffic alert and collision avoidance system resolution advisory

2nd Case - abbreviations and acronyms kept, spelled in upper case

TDZ

TDZ

Touchdown Zone

2nd Case - abbreviations and acronyms kept, spelled in upper case

TF

TF

Track to fix

2nd Case - abbreviations and acronyms kept, spelled in upper case

THR

THR

Threshold

2nd Case - abbreviations and acronyms kept, spelled in upper case

THU

THU

Thursday

2nd Case - abbreviations and acronyms kept, spelled in upper case

TMA

TMA

Terminal Control Area

2nd Case - abbreviations and acronyms kept, spelled in upper case

TODA

TODA

Take-off Distance Available

2nd Case - abbreviations and acronyms kept, spelled in upper case

TODAH

TODAH

Take-off Distance Available, Helicopter

2nd Case - abbreviations and acronyms kept, spelled in upper case

TORA

TORA

Take-off Run Available

2nd Case - abbreviations and acronyms kept, spelled in upper case

TP

TP

Turning Point

2nd Case - abbreviations and acronyms kept, spelled in upper case

TRL

TRL

Transition Level

2nd Case - abbreviations and acronyms kept, spelled in upper case

TUE

TUE

Tuesday

2nd Case - abbreviations and acronyms kept, spelled in upper case

T-VASIS

T-VASIS

T Visual Approach Slope Indicator System

2nd Case - abbreviations and acronyms kept, spelled in upper case

TVOR

TVOR

Terminal VOR

2nd Case - abbreviations and acronyms kept, spelled in upper case

TWR

TWR

Aerodrome control tower OR aerodrome control

2nd Case - abbreviations and acronyms kept, spelled in upper case

TWY

TWY

Taxiway

2nd Case - abbreviations and acronyms kept, spelled in upper case

UAC

UAC

Upper Area Control Centre

2nd Case - abbreviations and acronyms kept, spelled in upper case

UDF

UDF

Ultra High Frequency Direction Finding Station

2nd Case - abbreviations and acronyms kept, spelled in upper case

UHF

UHF

Ultra High Frequency 300 to 3000 MHz

2nd Case - abbreviations and acronyms kept, spelled in upper case

UIR

UIR

Upper Flight Information Region

2nd Case - abbreviations and acronyms kept, spelled in upper case

UTA

UTA

Upper Control Area

2nd Case - abbreviations and acronyms kept, spelled in upper case

UTC

UTC

Coordinated Universal Time

2nd Case - abbreviations and acronyms kept, spelled in upper case

VA

VA

Volcanic Ash

2nd Case - abbreviations and acronyms kept, spelled in upper case

VAAC

VAAC

Volcanic Ash Advisory Centre

2nd Case - abbreviations and acronyms kept, spelled in upper case

VAC

VAC

Visual Approach Chart

2nd Case - abbreviations and acronyms kept, spelled in upper case

VAR

VAR

Magnetic Variation

2nd Case - abbreviations and acronyms kept, spelled in upper case

VASIS

VASIS

Visual Approach Slope Indicator System

2nd Case - abbreviations and acronyms kept, spelled in upper case

VDF

VDF

Very High Frequency Direction Finding Station

2nd Case - abbreviations and acronyms kept, spelled in upper case

VFR

VFR

Visual Flight Rules

2nd Case - abbreviations and acronyms kept, spelled in upper case

VHF

VHF

Very High Frequency [30 to 300 MHz]

2nd Case - abbreviations and acronyms kept, spelled in upper case

VIP

VIP

Very Important Person

2nd Case - abbreviations and acronyms kept, spelled in upper case

VLF

VLF

Very Low Frequency [3 to 30 KHz]

2nd Case - abbreviations and acronyms kept, spelled in upper case

VMC

VMC

Visual Meteorological Conditions

2nd Case - abbreviations and acronyms kept, spelled in upper case

VNAV

VNAV

Vertical Navigation (to be pronounced "VEE-NAV")

2nd Case - abbreviations and acronyms kept, spelled in upper case

VOLMET

VOLMET

Meteorological information for aircraft in flight

2nd Case - abbreviations and acronyms kept, spelled in upper case

VOR

VOR

Very High Frequency Omnidirectional Radio Range

2nd Case - abbreviations and acronyms kept, spelled in upper case

VORTAC

VORTAC

VOR and TACAN combination

2nd Case - abbreviations and acronyms kept, spelled in upper case

VTOL

VTOL

Vertical Take-Off and Landing

2nd Case - abbreviations and acronyms kept, spelled in upper case

WAAS

WAAS

Wide Area Augmentation System

2nd Case - abbreviations and acronyms kept, spelled in upper case

WAC

WAC

World Aeronautical Chart — ICAO 1:1 000 000 (followed by name/title)

2nd Case - abbreviations and acronyms kept, spelled in upper case

WED

WED

Wednesday

2nd Case - abbreviations and acronyms kept, spelled in upper case

WGS-84

WGS-84

World Geodetic System - 1984

2nd Case - abbreviations and acronyms kept, spelled in upper case

WPT

WPT

Way-point

2nd Case - abbreviations and acronyms kept, spelled in upper case

A

amber

amber

3rd Case - abbreviations spelled out in sentence case

ABM

abeam

abeam

3rd Case - abbreviations spelled out in sentence case

ABT

about

about

3rd Case - abbreviations spelled out in sentence case

ABV

…or above

…or above

3rd Case - abbreviations spelled out in sentence case

ACP

acceptance

acceptance

3rd Case - abbreviations spelled out in sentence case

ACPT

accept

accept

3rd Case - abbreviations spelled out in sentence case

ACT

active, activated, activity

active, activated, activity

3rd Case - abbreviations spelled out in sentence case

ADDN

additional, addition

additional, addition

3rd Case - abbreviations spelled out in sentence case

ADJ

adjacent

adjacent

3rd Case - abbreviations spelled out in sentence case

ADR

advisory route

advisory route

3rd Case - abbreviations spelled out in sentence case

ADS

the address

the address

3rd Case - abbreviations spelled out in sentence case

ADZ

advise

advise

3rd Case - abbreviations spelled out in sentence case

AFM

affirm, affirmative

affirm, affirmative

3rd Case - abbreviations spelled out in sentence case

AFT

after

after

3rd Case - abbreviations spelled out in sentence case

AGN

again

again

3rd Case - abbreviations spelled out in sentence case

ALR

alerting

alerting

3rd Case - abbreviations spelled out in sentence case

AMD

amend, amended

amend, amended

3rd Case - abbreviations spelled out in sentence case

ANS

answer

answer

3rd Case - abbreviations spelled out in sentence case

AP

airport

airport

3rd Case - abbreviations spelled out in sentence case

APN

apron

apron

3rd Case - abbreviations spelled out in sentence case

APV

approve, approved, approval

approve, approved, approval

3rd Case - abbreviations spelled out in sentence case

ARNG

arrange

arrange

3rd Case - abbreviations spelled out in sentence case

ARST

arresting

arresting

3rd Case - abbreviations spelled out in sentence case

ASC

ascend to, ascending to

ascend to, ascending to

3rd Case - abbreviations spelled out in sentence case

AUX

auxiliary

auxiliary

3rd Case - abbreviations spelled out in sentence case

AVBL

available

available

3rd Case - abbreviations spelled out in sentence case

AVG

average

average

3rd Case - abbreviations spelled out in sentence case

B

blue

blue

3rd Case - abbreviations spelled out in sentence case

BCST

broadcast

broadcast

3rd Case - abbreviations spelled out in sentence case

BECMG

becoming

becoming

3rd Case - abbreviations spelled out in sentence case

BFR

before

before

3rd Case - abbreviations spelled out in sentence case

BKN

broken

broken

3rd Case - abbreviations spelled out in sentence case

BLDG

building

building

3rd Case - abbreviations spelled out in sentence case

BLW

below

below

3rd Case - abbreviations spelled out in sentence case

BOMB

bombing

bombing

3rd Case - abbreviations spelled out in sentence case

BRF

short

short

3rd Case - abbreviations spelled out in sentence case

BRKG

breaking

breaking

3rd Case - abbreviations spelled out in sentence case

BTN

between

between

3rd Case - abbreviations spelled out in sentence case

CD

candela

candela

3rd Case - abbreviations spelled out in sentence case

CIV

civil

civil

3rd Case - abbreviations spelled out in sentence case

CFM

confirm

confirm

3rd Case - abbreviations spelled out in sentence case

CH#

channel

channel

3rd Case - abbreviations spelled out in sentence case

CK

check

check

3rd Case - abbreviations spelled out in sentence case

CL

centre line

centre line

3rd Case - abbreviations spelled out in sentence case

CLBR

calibration

calibration

3rd Case - abbreviations spelled out in sentence case

CLD

cloud

cloud

3rd Case - abbreviations spelled out in sentence case

CLG

calling

calling

3rd Case - abbreviations spelled out in sentence case

CLR

cleared, clear, clearance

cleared, clear, clearance

3rd Case - abbreviations spelled out in sentence case

CLSD

close, closed, closing

close, closed, closing

3rd Case - abbreviations spelled out in sentence case

CMB

climb, climbing to

climb, climbing to

3rd Case - abbreviations spelled out in sentence case

CMPL

completion, complete,completed

completion, complete,completed

3rd Case - abbreviations spelled out in sentence case

CNL

cancel, cancelled

cancel, cancelled

3rd Case - abbreviations spelled out in sentence case

CONC

concrete

concrete

3rd Case - abbreviations spelled out in sentence case

CONS

continuous

continuous

3rd Case - abbreviations spelled out in sentence case

CONST

construction, constructed

construction, constructed

3rd Case - abbreviations spelled out in sentence case

COV

cover

cover

3rd Case - abbreviations spelled out in sentence case

CRZ

cruise

cruise

3rd Case - abbreviations spelled out in sentence case

CTC

contact

contact

3rd Case - abbreviations spelled out in sentence case

CTL

control

control

3rd Case - abbreviations spelled out in sentence case

CTN

caution

caution

3rd Case - abbreviations spelled out in sentence case

CUST

customs

customs

3rd Case - abbreviations spelled out in sentence case

D

downward

downward

3rd Case - abbreviations spelled out in sentence case

DEP

departure, depart

departure, depart

3rd Case - abbreviations spelled out in sentence case

DEPO

deposition

deposition

3rd Case - abbreviations spelled out in sentence case

DES

descend, descending

descend, descending

3rd Case - abbreviations spelled out in sentence case

DEV

deviation, deviating

deviation, deviating

3rd Case - abbreviations spelled out in sentence case

DIF

diffuse

diffuse

3rd Case - abbreviations spelled out in sentence case

DIV

divert, diverting

divert, diverting

3rd Case - abbreviations spelled out in sentence case

DLA

delay, delayed

delay, delayed

3rd Case - abbreviations spelled out in sentence case

DLY

daily

daily

3rd Case - abbreviations spelled out in sentence case

DNG

danger, dangerous

danger, dangerous

3rd Case - abbreviations spelled out in sentence case

DOM

domestic

domestic

3rd Case - abbreviations spelled out in sentence case

DPT

depth

depth

3rd Case - abbreviations spelled out in sentence case

DRG

during

during

3rd Case - abbreviations spelled out in sentence case

DUR

duration

duration

3rd Case - abbreviations spelled out in sentence case

E

east

east

3rd Case - abbreviations spelled out in sentence case

EB

eastbound

eastbound

3rd Case - abbreviations spelled out in sentence case

EM

emission

emission

3rd Case - abbreviations spelled out in sentence case

EMBD

embedded

embedded

3rd Case - abbreviations spelled out in sentence case

ENG

engine

engine

3rd Case - abbreviations spelled out in sentence case

EV

every

every

3rd Case - abbreviations spelled out in sentence case

EXC

except

except

3rd Case - abbreviations spelled out in sentence case

EXER

exercises, exercising, exercise

exercises, exercising, exercise

3rd Case - abbreviations spelled out in sentence case

EXP

expect

expect

3rd Case - abbreviations spelled out in sentence case

F

fixed

fixed

3rd Case - abbreviations spelled out in sentence case

FLT

flight, flights

flight, flights

3rd Case - abbreviations spelled out in sentence case

FLUC

fluctuating, fluctuation, fluctuated

fluctuating, fluctuation, fluctuated

3rd Case - abbreviations spelled out in sentence case

FLW

follows, following

follows, following

3rd Case - abbreviations spelled out in sentence case

FRQ

frequent

frequent

3rd Case - abbreviations spelled out in sentence case

FST

first

first

3rd Case - abbreviations spelled out in sentence case

G

green

green

3rd Case - abbreviations spelled out in sentence case

GLD

glider

glider

3rd Case - abbreviations spelled out in sentence case

GRVL

gravel

gravel

3rd Case - abbreviations spelled out in sentence case

HLDG

holding

holding

3rd Case - abbreviations spelled out in sentence case

HLP

heliport

heliport

3rd Case - abbreviations spelled out in sentence case

HVY

heavy

heavy

3rd Case - abbreviations spelled out in sentence case

HYR

higher

higher

3rd Case - abbreviations spelled out in sentence case

IMG

immigration

immigration

3rd Case - abbreviations spelled out in sentence case

IMPR

improving, improve

improving, improve

3rd Case - abbreviations spelled out in sentence case

IMT

immediate, immediately

immediate, immediately

3rd Case - abbreviations spelled out in sentence case

INBD

inbound

inbound

3rd Case - abbreviations spelled out in sentence case

INSTL

installed

installed

3rd Case - abbreviations spelled out in sentence case

INT

intersection

intersection

3rd Case - abbreviations spelled out in sentence case

LCA

local, located, location, locally

local, located, location, locally

3rd Case - abbreviations spelled out in sentence case

LEN

length

length

3rd Case - abbreviations spelled out in sentence case

LNG

long

long

3rd Case - abbreviations spelled out in sentence case

LGT

light or lighting

light or lighting

3rd Case - abbreviations spelled out in sentence case

LGTD

lighted

lighted

3rd Case - abbreviations spelled out in sentence case

LTD

limited

limited

3rd Case - abbreviations spelled out in sentence case

LVE

leave, leaving

leave, leaving

3rd Case - abbreviations spelled out in sentence case

LVL

level

level

3rd Case - abbreviations spelled out in sentence case

LYR

layer, layered

layer, layered

3rd Case - abbreviations spelled out in sentence case

MBST

microburst

microburst

3rd Case - abbreviations spelled out in sentence case

MNT

monitor, monitoring, monitored

monitor, monitoring, monitored

3rd Case - abbreviations spelled out in sentence case

MNTN

maintain

maintain

3rd Case - abbreviations spelled out in sentence case

MS

minus

minus

3rd Case - abbreviations spelled out in sentence case

MT

mountain

mountain

3rd Case - abbreviations spelled out in sentence case

N

north

north

3rd Case - abbreviations spelled out in sentence case

NB

northbound

northbound

3rd Case - abbreviations spelled out in sentence case

NGT

night

night

3rd Case - abbreviations spelled out in sentence case

NML

normal

normal

3rd Case - abbreviations spelled out in sentence case

NXT

next

next

3rd Case - abbreviations spelled out in sentence case

OBSC

obscure, obscured, obscuring

obscure, obscured, obscuring

3rd Case - abbreviations spelled out in sentence case

OCC

occulting

occulting

3rd Case - abbreviations spelled out in sentence case

OCNL

occasional, occasionally

occasional, occasionally

3rd Case - abbreviations spelled out in sentence case

OHD

overhead

overhead

3rd Case - abbreviations spelled out in sentence case

OPN

open

open

3rd Case - abbreviations spelled out in sentence case

OPR

operator, operate, operative

operator, operate, operative

3rd Case - abbreviations spelled out in sentence case

ORD

order

order

3rd Case - abbreviations spelled out in sentence case

OUBD

outbound

outbound

3rd Case - abbreviations spelled out in sentence case

OVC

overcast

overcast

3rd Case - abbreviations spelled out in sentence case

PARL

parallel

parallel

3rd Case - abbreviations spelled out in sentence case

PCD

proceed, proceeding

proceed, proceeding

3rd Case - abbreviations spelled out in sentence case

PCT

per cent

per cent

3rd Case - abbreviations spelled out in sentence case

PER

performance

performance

3rd Case - abbreviations spelled out in sentence case

POSS

possible

possible

3rd Case - abbreviations spelled out in sentence case

PRI

primary

primary

3rd Case - abbreviations spelled out in sentence case

PRKG

parking

parking

3rd Case - abbreviations spelled out in sentence case

PROV

provisional

provisional

3rd Case - abbreviations spelled out in sentence case

PS

plus

plus

3rd Case - abbreviations spelled out in sentence case

PSG

passing

passing

3rd Case - abbreviations spelled out in sentence case

PSN

position

position

3rd Case - abbreviations spelled out in sentence case

QUAD

quadrant

quadrant

3rd Case - abbreviations spelled out in sentence case

R

red

red

3rd Case - abbreviations spelled out in sentence case

RAG

ragged

ragged

3rd Case - abbreviations spelled out in sentence case

RCH

reach, reaching

reach, reaching

3rd Case - abbreviations spelled out in sentence case

RDO

radio

radio

3rd Case - abbreviations spelled out in sentence case

REC

receive, receiver

receive, receiver

3rd Case - abbreviations spelled out in sentence case

RDL

radial

radial

3rd Case - abbreviations spelled out in sentence case

RG

range

range

3rd Case - abbreviations spelled out in sentence case

RPLC

replace, replaced

replace, replaced

3rd Case - abbreviations spelled out in sentence case

RQMNTS

requirements

requirements

3rd Case - abbreviations spelled out in sentence case

RTF

radiotelephone

radiotelephone

3rd Case - abbreviations spelled out in sentence case

RTG

radiotelegraph

radiotelegraph

3rd Case - abbreviations spelled out in sentence case

RTN

return, returned, returning

return, returned, returning

3rd Case - abbreviations spelled out in sentence case

S

south

south

3rd Case - abbreviations spelled out in sentence case

SAN

sanitary

sanitary

3rd Case - abbreviations spelled out in sentence case

SB

southbound

southbound

3rd Case - abbreviations spelled out in sentence case

SECN

section

section

3rd Case - abbreviations spelled out in sentence case

SECT

sector

sector

3rd Case - abbreviations spelled out in sentence case

SER

service

service

3rd Case - abbreviations spelled out in sentence case

SGL

signal

signal

3rd Case - abbreviations spelled out in sentence case

SIMUL

simultaneous, simultaneously

simultaneous, simultaneously

3rd Case - abbreviations spelled out in sentence case

SLW

slow

slow

3rd Case - abbreviations spelled out in sentence case

SRY

secondary

secondary

3rd Case - abbreviations spelled out in sentence case

SS

sandstorm

sandstorm

3rd Case - abbreviations spelled out in sentence case

SVCBL

serviceable

serviceable

3rd Case - abbreviations spelled out in sentence case

T

temperature

temperature

3rd Case - abbreviations spelled out in sentence case

T

true

true

3rd Case - abbreviations spelled out in sentence case

TAIL

tail wind

tail wind

3rd Case - abbreviations spelled out in sentence case

TAX

taxiing, taxi

taxiing, taxi

3rd Case - abbreviations spelled out in sentence case

THRU

through

through

3rd Case - abbreviations spelled out in sentence case

TIL

until

until

3rd Case - abbreviations spelled out in sentence case

TOX

toxic

toxic

3rd Case - abbreviations spelled out in sentence case

TR

track

track

3rd Case - abbreviations spelled out in sentence case

TROP

tropopause

tropopause

3rd Case - abbreviations spelled out in sentence case

TT

teletypewriter

teletypewriter

3rd Case - abbreviations spelled out in sentence case

U/S

unserviceable

unserviceable

3rd Case - abbreviations spelled out in sentence case

UNA

unable

unable

3rd Case - abbreviations spelled out in sentence case

UNL

unlimited

unlimited

3rd Case - abbreviations spelled out in sentence case

UNREL

unreliable

unreliable

3rd Case - abbreviations spelled out in sentence case

VCY

vicinity

vicinity

3rd Case - abbreviations spelled out in sentence case

VER

vertical

vertical

3rd Case - abbreviations spelled out in sentence case

VIS

visibility

visibility

3rd Case - abbreviations spelled out in sentence case

W

west

west

3rd Case - abbreviations spelled out in sentence case

W

white

white

3rd Case - abbreviations spelled out in sentence case

WB

westbound

westbound

3rd Case - abbreviations spelled out in sentence case

WI

within

within

3rd Case - abbreviations spelled out in sentence case

WID

width

width

3rd Case - abbreviations spelled out in sentence case

WKN

weaken, weakening

weaken, weakening

3rd Case - abbreviations spelled out in sentence case

WO

without

without

3rd Case - abbreviations spelled out in sentence case

WS

windshear

windshear

3rd Case - abbreviations spelled out in sentence case

WSPD

windspeed

windspeed

3rd Case - abbreviations spelled out in sentence case

WT

weight

weight

3rd Case - abbreviations spelled out in sentence case

WTSPT

waterspout

waterspout

3rd Case - abbreviations spelled out in sentence case

WX

weather radar

weather radar

3rd Case - abbreviations spelled out in sentence case

X

cross

cross

3rd Case - abbreviations spelled out in sentence case

XBAR

crossbar

crossbar

3rd Case - abbreviations spelled out in sentence case

XNG

crossing

crossing

3rd Case - abbreviations spelled out in sentence case

XS

atmospheric

atmospheric

3rd Case - abbreviations spelled out in sentence case

Y

yellow

yellow

3rd Case - abbreviations spelled out in sentence case

AAD

assigned altitude deviation

assigned altitude deviation

4th Case - acronyms spelled out in lower case

AAR

air to air refuelling

air to air refuelling

4th Case - acronyms spelled out in lower case

ABI

advance boundary information

advance boundary information

4th Case - acronyms spelled out in lower case

ADO

aerodrome office

aerodrome office

4th Case - acronyms spelled out in lower case

ADVS

advisory service

advisory service

4th Case - acronyms spelled out in lower case

AES

aircraft earth station

aircraft earth station

4th Case - acronyms spelled out in lower case

AIDC

air traffic services interfacility data communications

air traffic services interfacility data communications

4th Case - acronyms spelled out in lower case

AIREP

air-report

air-report

4th Case - acronyms spelled out in lower case

ALA

alighting area

alighting area

4th Case - acronyms spelled out in lower case

ALRS

alerting service

alerting service

4th Case - acronyms spelled out in lower case

AMS

aeronautical mobile service

aeronautical mobile service

4th Case - acronyms spelled out in lower case

AMSS

aeronautical mobile satellite service

aeronautical mobile satellite service

4th Case - acronyms spelled out in lower case

APSG

after passing

after passing

4th Case - acronyms spelled out in lower case

ARP

air-report

air-report

4th Case - acronyms spelled out in lower case

ARQ

automatic error correction

automatic error correction

4th Case - acronyms spelled out in lower case

ARS

special air-report

special air-report

4th Case - acronyms spelled out in lower case

ASE

altimetry system error

altimetry system error

4th Case - acronyms spelled out in lower case

ATP

at… time or place

at… time or place

4th Case - acronyms spelled out in lower case

AUW

all up weight

all up weight

4th Case - acronyms spelled out in lower case

AWTA

advise at what time able

advise at what time able

4th Case - acronyms spelled out in lower case

BA

braking action (not each word in upper)

braking action (not each word in upper)

4th Case - acronyms spelled out in lower case

BASE

cloud base

cloud base

4th Case - acronyms spelled out in lower case

BLO

below clouds

below clouds

4th Case - acronyms spelled out in lower case

BS

commercial broadcasting station

commercial broadcasting station

4th Case - acronyms spelled out in lower case

BTL

between layers

between layers

4th Case - acronyms spelled out in lower case

CA

course to an altitude

course to an altitude

4th Case - acronyms spelled out in lower case

CAT

clear air turbulence

clear air turbulence

4th Case - acronyms spelled out in lower case

CF

change frequency to

change frequency to

4th Case - acronyms spelled out in lower case

CF

course to a fix

course to a fix

4th Case - acronyms spelled out in lower case

CGL

circling guidance lights

circling guidance lights

4th Case - acronyms spelled out in lower case

CLA

clear type of ice formation

clear type of ice formation

4th Case - acronyms spelled out in lower case

CLIMB-OUT

climb-out area

climb-out area

4th Case - acronyms spelled out in lower case

CLRD

RWY cleared

RWY cleared

4th Case - acronyms spelled out in lower case

COP

change-over point

change-over point

4th Case - acronyms spelled out in lower case

COT

at the coast

at the coast

4th Case - acronyms spelled out in lower case

CPL

current flight plan

current flight plan

4th Case - acronyms spelled out in lower case

CRM

collision risk model

collision risk model

4th Case - acronyms spelled out in lower case

CTAM

climb and maintain

climb and maintain

4th Case - acronyms spelled out in lower case

CVR

cockpit voice recorder

cockpit voice recorder

4th Case - acronyms spelled out in lower case

CW

continuous wave

continuous wave

4th Case - acronyms spelled out in lower case

DCD

double channel duplex

double channel duplex

4th Case - acronyms spelled out in lower case

DCP

datum crossing point

datum crossing point

4th Case - acronyms spelled out in lower case

DCS

double channel simplex

double channel simplex

4th Case - acronyms spelled out in lower case

DER

departure end of RWY

departure end of RWY

4th Case - acronyms spelled out in lower case

DFDR

digital flight data recorder

digital flight data recorder

4th Case - acronyms spelled out in lower case

DFTI

distance from touchdown indication

distance from touchdown indication

4th Case - acronyms spelled out in lower case

DLIC

data link initiation capability

data link initiation capability

4th Case - acronyms spelled out in lower case

DOF

date of flight

date of flight

4th Case - acronyms spelled out in lower case

DP

dew point temperature

dew point temperature

4th Case - acronyms spelled out in lower case

DR

dead reckoning

dead reckoning

4th Case - acronyms spelled out in lower case

DSB

double sideband

double sideband

4th Case - acronyms spelled out in lower case

DTAM

descend to and maintain

descend to and maintain

4th Case - acronyms spelled out in lower case

DTG

date-time-group

date-time-group

4th Case - acronyms spelled out in lower case

DTHR

displaced THR

displaced THR

4th Case - acronyms spelled out in lower case

DTRT

deteriorate, deteriorating

deteriorate, deteriorating

4th Case - acronyms spelled out in lower case

DTW

dual tandem wheels

dual tandem wheels

4th Case - acronyms spelled out in lower case

DUC

dense upper cloud

dense upper cloud

4th Case - acronyms spelled out in lower case

DUPE#

duplicated message

duplicated message

4th Case - acronyms spelled out in lower case

DW

dual wheels

dual wheels

4th Case - acronyms spelled out in lower case

EAT

expected approach time

expected approach time

4th Case - acronyms spelled out in lower case

EDA

elevation differential area

elevation differential area

4th Case - acronyms spelled out in lower case

EET

estimated elapsed time

estimated elapsed time

4th Case - acronyms spelled out in lower case

EFC

expected further clearance

expected further clearance

4th Case - acronyms spelled out in lower case

EFIS

electronic flight instrument systems

electronic flight instrument systems

4th Case - acronyms spelled out in lower case

ELR

extra long range

extra long range

4th Case - acronyms spelled out in lower case

END

stop-end

stop-end

4th Case - acronyms spelled out in lower case

ENE

east-north-east

east-north-east

4th Case - acronyms spelled out in lower case

ESE

east-south-east

east-south-east

4th Case - acronyms spelled out in lower case

EVS

enhanced vision system

enhanced vision system

4th Case - acronyms spelled out in lower case

FCT

friction coefficient

friction coefficient

4th Case - acronyms spelled out in lower case

FDPS

flight data processing system

flight data processing system

4th Case - acronyms spelled out in lower case

FISA

Use 'Automated FIS' instead.

Use 'Automated FIS' instead.

4th Case - acronyms spelled out in lower case

FLTCK

flight check

flight check

4th Case - acronyms spelled out in lower case

FLY

fly, flying

fly, flying

4th Case - acronyms spelled out in lower case

FM

from

from

4th Case - acronyms spelled out in lower case

FNA

final approach

final approach

4th Case - acronyms spelled out in lower case

FPAP

flight path alignment point

flight path alignment point

4th Case - acronyms spelled out in lower case

FPM

feet per minute

feet per minute

4th Case - acronyms spelled out in lower case

FPR

fligh plan route

fligh plan route

4th Case - acronyms spelled out in lower case

FR

fuel remaining

fuel remaining

4th Case - acronyms spelled out in lower case

FSL

full stop landing

full stop landing

4th Case - acronyms spelled out in lower case

FSS

flight service station

flight service station

4th Case - acronyms spelled out in lower case

FTE

flight technical error

flight technical error

4th Case - acronyms spelled out in lower case

FTT

flight technical tolerance

flight technical tolerance

4th Case - acronyms spelled out in lower case

GA

go ahead, resume sending

go ahead, resume sending

4th Case - acronyms spelled out in lower case

GAIN

airspeed or headwind gain

airspeed or headwind gain

4th Case - acronyms spelled out in lower case

GARP

GBAS azimuth reference point

GBAS azimuth reference point

4th Case - acronyms spelled out in lower case

GLS

GLS landing system

GLS landing system

4th Case - acronyms spelled out in lower case

GNDCK

ground check

ground check

4th Case - acronyms spelled out in lower case

GPA

glide path angle

glide path angle

4th Case - acronyms spelled out in lower case

GPIP

glide path intercept point

glide path intercept point

4th Case - acronyms spelled out in lower case

GRAS

ground based regional augmentation system

ground based regional augmentation system

4th Case - acronyms spelled out in lower case

GUND

geoid undulation

geoid undulation

4th Case - acronyms spelled out in lower case

HA

holding/racetrack to an altitude

holding/racetrack to an altitude

4th Case - acronyms spelled out in lower case

HBN

hazard beacon

hazard beacon

4th Case - acronyms spelled out in lower case

HF

holding/racetrack to a fix

holding/racetrack to a fix

4th Case - acronyms spelled out in lower case

HLS

heliport landing site

heliport landing site

4th Case - acronyms spelled out in lower case

HM

holding/racetrack to a manual termination

holding/racetrack to a manual termination

4th Case - acronyms spelled out in lower case

HUD

head-up display

head-up display

4th Case - acronyms spelled out in lower case

IAO

in and out of clouds

in and out of clouds

4th Case - acronyms spelled out in lower case

IAR

intersection of air routes

intersection of air routes

4th Case - acronyms spelled out in lower case

IBN

identification beacon

identification beacon

4th Case - acronyms spelled out in lower case

IFF

identification friend/foe

identification friend/foe

4th Case - acronyms spelled out in lower case

IGA

international general aviation

international general aviation

4th Case - acronyms spelled out in lower case

INA

intital approach

intital approach

4th Case - acronyms spelled out in lower case

INC

in cloud

in cloud

4th Case - acronyms spelled out in lower case

INP

if not possible

if not possible

4th Case - acronyms spelled out in lower case

INPR

in progress

in progress

4th Case - acronyms spelled out in lower case

ISB

independent sideband

independent sideband

4th Case - acronyms spelled out in lower case

ISOL

isolated

isolated

4th Case - acronyms spelled out in lower case

JTST

jetstream

jetstream

4th Case - acronyms spelled out in lower case

LAN

inland

inland

4th Case - acronyms spelled out in lower case

LMT

local mean time

local mean time

4th Case - acronyms spelled out in lower case

LOSS

airspeed or headwind loss

airspeed or headwind loss

4th Case - acronyms spelled out in lower case

LRG

long range

long range

4th Case - acronyms spelled out in lower case

LTP

landing thr point

landing thr point

4th Case - acronyms spelled out in lower case

MAHF

missed approach holding fix

missed approach holding fix

4th Case - acronyms spelled out in lower case

MAR

at sea

at sea

4th Case - acronyms spelled out in lower case

MATF

missed approach turning fix

missed approach turning fix

4th Case - acronyms spelled out in lower case

MCW

modulated continuous wave

modulated continuous wave

4th Case - acronyms spelled out in lower case

MDF

medium frequency direction finding station

medium frequency direction finding station

4th Case - acronyms spelled out in lower case

MHDF

medium and high frequency direction finding stations

medium and high frequency direction finding stations

4th Case - acronyms spelled out in lower case

MHVDF

medium, high and very high frequency direction finding stations

medium, high and very high frequency direction finding stations

4th Case - acronyms spelled out in lower case

MID

mid-point

mid-point

4th Case - acronyms spelled out in lower case

MON

above mountains

above mountains

4th Case - acronyms spelled out in lower case

MOPS

minimum operational performance standards

minimum operational performance standards

4th Case - acronyms spelled out in lower case

MRG

medim range

medim range

4th Case - acronyms spelled out in lower case

MSAW

minimum safety altitude warning

minimum safety altitude warning

4th Case - acronyms spelled out in lower case

MTOM

maximum take-off mass

maximum take-off mass

4th Case - acronyms spelled out in lower case

MTU

metric units

metric units

4th Case - acronyms spelled out in lower case

MTW

moutain waves

moutain waves

4th Case - acronyms spelled out in lower case

MVDF

medium and very high hrequency direction finding stations

medium and very high hrequency direction finding stations

4th Case - acronyms spelled out in lower case

N

no distinct tendency

no distinct tendency

4th Case - acronyms spelled out in lower case

NADP

noise abatement departure procedure

noise abatement departure procedure

4th Case - acronyms spelled out in lower case

NASC

national AIS system centre

national AIS system centre

4th Case - acronyms spelled out in lower case

NBFR

not before

not before

4th Case - acronyms spelled out in lower case

NC

no change

no change

4th Case - acronyms spelled out in lower case

NE

north-east

north-east

4th Case - acronyms spelled out in lower case

NEB

north-eastbound

north-eastbound

4th Case - acronyms spelled out in lower case

NEG

negative

negative

4th Case - acronyms spelled out in lower case

NN

no name, unnamed

no name, unnamed

4th Case - acronyms spelled out in lower case

NNE

north-north-east

north-north-east

4th Case - acronyms spelled out in lower case

NNW

north-north-west

north-north-west

4th Case - acronyms spelled out in lower case

NRH

no reply heard

no reply heard

4th Case - acronyms spelled out in lower case

NSE

navigation system error

navigation system error

4th Case - acronyms spelled out in lower case

NSW

nil significant weather

nil significant weather

4th Case - acronyms spelled out in lower case

NW

north-west

north-west

4th Case - acronyms spelled out in lower case

NWB

north-westbound

north-westbound

4th Case - acronyms spelled out in lower case

OPC

the control indicated is operational control

the control indicated is operational control

4th Case - acronyms spelled out in lower case

OSV

ocean station vessel

ocean station vessel

4th Case - acronyms spelled out in lower case

OTP

on top

on top

4th Case - acronyms spelled out in lower case

PA

precision approach

precision approach

4th Case - acronyms spelled out in lower case

PCL

pilot-controlled lighting

pilot-controlled lighting

4th Case - acronyms spelled out in lower case

PDC

pre-departure clearance

pre-departure clearance

4th Case - acronyms spelled out in lower case

PDG

procedure design gradient

procedure design gradient

4th Case - acronyms spelled out in lower case

PJE

parachute jumping exercise

parachute jumping exercise

4th Case - acronyms spelled out in lower case

PLA

practice low approach

practice low approach

4th Case - acronyms spelled out in lower case

PLVL

present level

present level

4th Case - acronyms spelled out in lower case

PN

prior notice required

prior notice required

4th Case - acronyms spelled out in lower case

PNR

point of no return

point of no return

4th Case - acronyms spelled out in lower case

POB

persons on board

persons on board

4th Case - acronyms spelled out in lower case

PPI

plan position indicator

plan position indicator

4th Case - acronyms spelled out in lower case

PPSN

present position

present position

4th Case - acronyms spelled out in lower case

PRP

point-in-space reference point

point-in-space reference point

4th Case - acronyms spelled out in lower case

PSP

pierced steel plank

pierced steel plank

4th Case - acronyms spelled out in lower case

PSYS

pressure system(s)

pressure system(s)

4th Case - acronyms spelled out in lower case

PTN

procedure turn

procedure turn

4th Case - acronyms spelled out in lower case

R

rate of turn

rate of turn

4th Case - acronyms spelled out in lower case

RA

resolution advisory

resolution advisory

4th Case - acronyms spelled out in lower case

RAG

RWY arresting gear

RWY arresting gear

4th Case - acronyms spelled out in lower case

RAI

RWY alignment indicator

RWY alignment indicator

4th Case - acronyms spelled out in lower case

RB

rescue boat

rescue boat

4th Case - acronyms spelled out in lower case

RCL

RWY centre line

RWY centre line

4th Case - acronyms spelled out in lower case

RCLL

RWY centre line light(s)

RWY centre line light(s)

4th Case - acronyms spelled out in lower case

RCLR

recleared

recleared

4th Case - acronyms spelled out in lower case

RCP

required communication performance

required communication performance

4th Case - acronyms spelled out in lower case

REDL

RWY edge light(s)

RWY edge light(s)

4th Case - acronyms spelled out in lower case

RENL

RWY end light(s)

RWY end light(s)

4th Case - acronyms spelled out in lower case

RHC

right-hand circuit

right-hand circuit

4th Case - acronyms spelled out in lower case

RIF

reclearance in flight

reclearance in flight

4th Case - acronyms spelled out in lower case

RL

report leaving

report leaving

4th Case - acronyms spelled out in lower case

RLA

relay to

relay to

4th Case - acronyms spelled out in lower case

RLCE

request level change en-route

request level change en-route

4th Case - acronyms spelled out in lower case

RLLS

RWY lead-in lighting system

RWY lead-in lighting system

4th Case - acronyms spelled out in lower case

RLNA

requested level not available

requested level not available

4th Case - acronyms spelled out in lower case

RNG

radio range

radio range

4th Case - acronyms spelled out in lower case

ROC

rate of climb

rate of climb

4th Case - acronyms spelled out in lower case

ROD

rate of descent

rate of descent

4th Case - acronyms spelled out in lower case

RON

receiving only

receiving only

4th Case - acronyms spelled out in lower case

RPDS

reference path data selector

reference path data selector

4th Case - acronyms spelled out in lower case

RPI

radar position Indicator

radar position Indicator

4th Case - acronyms spelled out in lower case

RR

report reaching

report reaching

4th Case - acronyms spelled out in lower case

RSC

rescue sub-centre

rescue sub-centre

4th Case - acronyms spelled out in lower case

RSCD

runway surface condition

runway surface condition

4th Case - acronyms spelled out in lower case

RSP

responder beacon

responder beacon

4th Case - acronyms spelled out in lower case

RSS

root sum square

root sum square

4th Case - acronyms spelled out in lower case

RTHL

RWY THR light(s)

RWY THR light(s)

4th Case - acronyms spelled out in lower case

RTODAH

rejected take-off distance available, helicopter

rejected take-off distance available, helicopter

4th Case - acronyms spelled out in lower case

RTS

return to service

return to service

4th Case - acronyms spelled out in lower case

RTT

radioteletypewriter

radioteletypewriter

4th Case - acronyms spelled out in lower case

RTZL

RWY touchdown zone light(s)

RWY touchdown zone light(s)

4th Case - acronyms spelled out in lower case

RUT

standard regional route transmitting frequencies

standard regional route transmitting frequencies

4th Case - acronyms spelled out in lower case

RV

rescue vessel

rescue vessel

4th Case - acronyms spelled out in lower case

SD

standard deviation

standard deviation

4th Case - acronyms spelled out in lower case

SDBY

stand by

stand by

4th Case - acronyms spelled out in lower case

SDF

step down fix

step down fix

4th Case - acronyms spelled out in lower case

SE

south-east

south-east

4th Case - acronyms spelled out in lower case

SEB

south-eastbound

south-eastbound

4th Case - acronyms spelled out in lower case

SIF

selective identification feature

selective identification feature

4th Case - acronyms spelled out in lower case

SIWL

single isolated wheel load

single isolated wheel load

4th Case - acronyms spelled out in lower case

SLP

speed limiting point

speed limiting point

4th Case - acronyms spelled out in lower case

SOC

start of climb

start of climb

4th Case - acronyms spelled out in lower case

SPI

special position indicator

special position indicator

4th Case - acronyms spelled out in lower case

SPL

supplementary flight plan

supplementary flight plan

4th Case - acronyms spelled out in lower case

SPOC

SAR point of contact

SAR point of contact

4th Case - acronyms spelled out in lower case

SPOT

spot wind

spot wind

4th Case - acronyms spelled out in lower case

SRG

short range

short range

4th Case - acronyms spelled out in lower case

SSB

single sideband

single sideband

4th Case - acronyms spelled out in lower case

SSE

south-south-east

south-south-east

4th Case - acronyms spelled out in lower case

SST

supersonic transport

supersonic transport

4th Case - acronyms spelled out in lower case

SSW

south-south-west

south-south-west

4th Case - acronyms spelled out in lower case

STA

straight-in approach

straight-in approach

4th Case - acronyms spelled out in lower case

STOL

short take-off and landing

short take-off and landing

4th Case - acronyms spelled out in lower case

STWL

stopway lights

stopway lights

4th Case - acronyms spelled out in lower case

SW

south-west

south-west

4th Case - acronyms spelled out in lower case

SWB

south-westbound

south-westbound

4th Case - acronyms spelled out in lower case

TA

traffic advisory

traffic advisory

4th Case - acronyms spelled out in lower case

TECR

technical reason

technical reason

4th Case - acronyms spelled out in lower case

TIP

until past… (place)

until past… (place)

4th Case - acronyms spelled out in lower case

TNA

turn altitude

turn altitude

4th Case - acronyms spelled out in lower case

TNH

turn height

turn height

4th Case - acronyms spelled out in lower case

TOC

top of climb

top of climb

4th Case - acronyms spelled out in lower case

TOP

cloud top

cloud top

4th Case - acronyms spelled out in lower case

TWYL

taxiway-link

taxiway-link

4th Case - acronyms spelled out in lower case

TYP

type of aircraft

type of aircraft

4th Case - acronyms spelled out in lower case

UA

unmanned acft

unmanned acft

4th Case - acronyms spelled out in lower case

UAB

until advised by

until advised by

4th Case - acronyms spelled out in lower case

UHDT

unable higher due traffic

unable higher due traffic

4th Case - acronyms spelled out in lower case

ULM

ultralight motorized acft

ultralight motorized acft

4th Case - acronyms spelled out in lower case

ULR

ultra long range

ultra long range

4th Case - acronyms spelled out in lower case

UNAP

unable to approve

unable to approve

4th Case - acronyms spelled out in lower case

VA

heading to an altitude

heading to an altitude

4th Case - acronyms spelled out in lower case

VAL

in valleys

in valleys

4th Case - acronyms spelled out in lower case

VAN

RWY control van

RWY control van

4th Case - acronyms spelled out in lower case

VAR

visual-aural radio range

visual-aural radio range

4th Case - acronyms spelled out in lower case

VI

heading to an intercept

heading to an intercept

4th Case - acronyms spelled out in lower case

VLR

very long range

very long range

4th Case - acronyms spelled out in lower case

VM

heading to a manual termination

heading to a manual termination

4th Case - acronyms spelled out in lower case

VOT

VOR airborne equipment test facility

VOR airborne equipment test facility

4th Case - acronyms spelled out in lower case

VPA

vertical path angle

vertical path angle

4th Case - acronyms spelled out in lower case

VPT

visual manoeuvre with prescribed track

visual manoeuvre with prescribed track

4th Case - acronyms spelled out in lower case

VSA

by visual reference to the ground

by visual reference to the ground

4th Case - acronyms spelled out in lower case

VSP

vertical speed

vertical speed

4th Case - acronyms spelled out in lower case

VTF

vector to final

vector to final

4th Case - acronyms spelled out in lower case

WAFC

world area forecast centre

world area forecast centre

4th Case - acronyms spelled out in lower case

WBAR

wing bar lights

wing bar lights

4th Case - acronyms spelled out in lower case

WDSPR

widespread

widespread

4th Case - acronyms spelled out in lower case

WNW

west-north-west

west-north-west

4th Case - acronyms spelled out in lower case

WSW

west-south-west

west-south-west

4th Case - acronyms spelled out in lower case

WX

weather

weather

4th Case - acronyms spelled out in lower case

AAIM

Aircraft Autonomous Integrity Monitoring

Aircraft Autonomous Integrity Monitoring

5th Case - acronyms spelled out in Sentence Case+D1

AAL

Above Aerodrome Level

Above Aerodrome Level

5th Case - acronyms spelled out in Sentence Case

ADA

Advisory Area

Advisory Area

5th Case - acronyms spelled out in Sentence Case

ADC

Aerodrome Chart

Aerodrome Chart

5th Case - acronyms spelled out in Sentence Case

AFS

Aeronautical Fixed Service

Aeronautical Fixed Service

5th Case - acronyms spelled out in Sentence Case

AIM

Aeronautical Information Management

Aeronautical Information Management

5th Case - acronyms spelled out in Sentence Case

ALS

Approach Lighting System

Approach Lighting System

5th Case - acronyms spelled out in Sentence Case

AMA

Area Minimum ALT

Area Minimum ALT

5th Case - acronyms spelled out in Sentence Case

ARC

Area Chart

Area Chart

5th Case - acronyms spelled out in Sentence Case

ATCSMAC

ATC Surveillance Minimum ALT Chart

ATC Surveillance Minimum ALT Chart

5th Case - acronyms spelled out in Sentence Case

CDO

Continuous Descent Operations

Continuous Descent Operations

5th Case - acronyms spelled out in Sentence Case

CRP

Compulsory Reporting Point

Compulsory Reporting Point

5th Case - acronyms spelled out in Sentence Case

CRC

Cyclic Redundancy Check

Cyclic Redundancy Check

5th Case - acronyms spelled out in Sentence Case

D

Danger Area

Danger Area

5th Case - acronyms spelled out in Sentence Case

DCPC

Direct Controller-Pilot Communication

Direct Controller-Pilot Communication

5th Case - acronyms spelled out in Sentence Case

FMC

Flight Management Computer

Flight Management Computer

5th Case - acronyms spelled out in Sentence Case

FMS

Flight Management System

Flight Management System

5th Case - acronyms spelled out in Sentence Case

FMU

Flow Management Unit

Flow Management Unit

5th Case - acronyms spelled out in Sentence Case

GCA

Ground Controlled APP

Ground Controlled APP

5th Case - acronyms spelled out in Sentence Case

GES

Ground Earth Station

Ground Earth Station

5th Case - acronyms spelled out in Sentence Case

GMC

Ground Movement Chart

Ground Movement Chart

5th Case - acronyms spelled out in Sentence Case

GPU

Ground Power Unit

Ground Power Unit

5th Case - acronyms spelled out in Sentence Case

GPWS

Ground Proxmity Warning Area

Ground Proxmity Warning Area

5th Case - acronyms spelled out in Sentence Case

GRASS

Grass Landing Area

Grass Landing Area

5th Case - acronyms spelled out in Sentence Case

LTA

Lower Control Area

Lower Control Area

5th Case - acronyms spelled out in Sentence Case

MAA

Max Authorised ALT

Max Authorised ALT

5th Case - acronyms spelled out in Sentence Case

MCA

Minimum Crossing ALT

Minimum Crossing ALT

5th Case - acronyms spelled out in Sentence Case

MEA

Miminum ENR ALT

Miminum ENR ALT

5th Case - acronyms spelled out in Sentence Case

MHA

Minimum Holding ALT

Minimum Holding ALT

5th Case - acronyms spelled out in Sentence Case

MNPS

Minimum Navigation Performance Specifications

Minimum Navigation Performance Specifications

5th Case - acronyms spelled out in Sentence Case

MRA

Minimum Reception ALT

Minimum Reception ALT

5th Case - acronyms spelled out in Sentence Case

MSA

Minimum Sector ALT

Minimum Sector ALT

5th Case - acronyms spelled out in Sentence Case

MOCA

Minimum Obstacle Clearance ALT

Minimum Obstacle Clearance ALT

5th Case - acronyms spelled out in Sentence Case

MSAS

Multifunctional Transport Satellite Satellite-based Augmentation System

Multifunctional Transport Satellite Satellite-based Augmentation System

5th Case - acronyms spelled out in Sentence Case

NOZ

Normal Operating Zone

Normal Operating Zone

5th Case - acronyms spelled out in Sentence Case

NTZ

No Transgression Zone

No Transgression Zone

5th Case - acronyms spelled out in Sentence Case

OAS

Obstacle Assessment Surface

Obstacle Assessment Surface

5th Case - acronyms spelled out in Sentence Case

OCA

Oceanic Control Area

Oceanic Control Area

5th Case - acronyms spelled out in Sentence Case

OCS

Obstacle Clearance Surface

Obstacle Clearance Surface

5th Case - acronyms spelled out in Sentence Case

OFZ

Obstacle Free Zone

Obstacle Free Zone

5th Case - acronyms spelled out in Sentence Case

OIS

Obstacle Identification Surface

Obstacle Identification Surface

5th Case - acronyms spelled out in Sentence Case

OTS

Organised Track System

Organised Track System

5th Case - acronyms spelled out in Sentence Case

PALS

Precision Approach Lighting System

Precision Approach Lighting System

5th Case - acronyms spelled out in Sentence Case

P

Prohibited Area

Prohibited Area

5th Case - acronyms spelled out in Sentence Case

PTS

Polar Track Structure

Polar Track Structure

5th Case - acronyms spelled out in Sentence Case

R

Restricted Area

Restricted Area

5th Case - acronyms spelled out in Sentence Case

RASC

Regional AIS System Centre

Regional AIS System Centre

5th Case - acronyms spelled out in Sentence Case

RASS

Remote Altimeter Setting Source

Remote Altimeter Setting Source

5th Case - acronyms spelled out in Sentence Case

RCA

Reach Cruising ALT

Reach Cruising ALT

5th Case - acronyms spelled out in Sentence Case

RFFS

Rescue and Fire Fighting Services

Rescue and Fire Fighting Services

5th Case - acronyms spelled out in Sentence Case

RPS

Radar Position Symbol

Radar Position Symbol

5th Case - acronyms spelled out in Sentence Case

RVA

RWY Vectoring Area

RWY Vectoring Area

5th Case - acronyms spelled out in Sentence Case

SALS

Simple Approach Lighting Systems

Simple Approach Lighting Systems

5th Case - acronyms spelled out in Sentence Case

SMC

Surface Movement Control

Surface Movement Control

5th Case - acronyms spelled out in Sentence Case

SMR

Surface Movement Radar

Surface Movement Radar

5th Case - acronyms spelled out in Sentence Case

SRR

SAR Region

SAR Region

5th Case - acronyms spelled out in Sentence Case

TAA

Terminal Arrival ALT

Terminal Arrival ALT

5th Case - acronyms spelled out in Sentence Case

TCH

THR Crossing Height

THR Crossing Height

5th Case - acronyms spelled out in Sentence Case

TGS

Taxiing Guidance System

Taxiing Guidance System

5th Case - acronyms spelled out in Sentence Case

TIBA

Traffic Information Broadcast by Aircraft

Traffic Information Broadcast by Aircraft

5th Case - acronyms spelled out in Sentence Case

TRA

Temporary Reserved Airspace

Temporary Reserved Airspace

5th Case - acronyms spelled out in Sentence Case

UAR

Upper Air Route

Upper Air Route

5th Case - acronyms spelled out in Sentence Case

UIC

Upper Information Centre

Upper Information Centre

5th Case - acronyms spelled out in Sentence Case

YCZ

Yellow Caution Zone

Yellow Caution Zone

5th Case - acronyms spelled out in Sentence Case

C

C

degrees Celsius

6th Case - units of measurement

FT

ft

foot/feet

6th Case - units of measurement

HPA

hPa

hectopascal

6th Case - units of measurement

HZ

Hz

hertz

6th Case - units of measurement

HR

HR

hour

6th Case - units of measurement

KG

kg

kilogram

6th Case - units of measurement

KM

km

kilometer

6th Case - units of measurement

KMH

kmh

kilometer per hour

6th Case - units of measurement

KPA

kPa

kilopascal

6th Case - units of measurement

KW

kW

kilowatt

6th Case - units of measurement

KT

kt

knots

6th Case - units of measurement

LITRE

litre

litre

6th Case - units of measurement

MHZ

MHz

megahertz

6th Case - units of measurement

M

m

metre

6th Case - units of measurement

MIN

min

minute

6th Case - units of measurement

NM

NM

nautical mile

6th Case - units of measurement

SEC

sec

second

6th Case - units of measurement

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