Page tree

Versions Compared

Key

  • This line was added.
  • This line was removed.
  • Formatting was changed.

...

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

Anchor
_GoBack
_GoBack

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