FullDescription:Terminal Procedures

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Advanced Airport Approach Procedures including Validation and Elaboration

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Term Advanced Airport Approach Procedures including Validation and Elaboration
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Advanced Airport Approach Procedures Validation

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Abbreviation

APPROVE

Definition

Project co-funded by the European Commission Directorate General for Transport through the TEN-T programme, compris(ing) the implementation of advanced approach procedures to obtain capacity benefits.

Definition Source

EUROCONTROL (2004) EATMP glossary, June 2004

Note

Aircraft Approach Category

Link Semantic Value
Term Aircraft Approach Category
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Aircraft Landing Category

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Definition

A grouping of aircraft based on a speed of 1.3 times the stall speed in the landing configuration at maximum gross landing weight.

Definition Source

Aeronautical Information Feature Data Dictionary (AIFDD)

Note

Aircraft Approach Limitation

Link Semantic Value
Term aircraft approach limitation
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Abbreviation

AAL

Definition

The lowest true height above the touch-down point to which a particular type of aircraft may descend on instruments using a specified runway approach aid. It does not take into account local terrain or obstructions.

Definition Source

NATO; Agard Multilingual Aeronautical Dictionary

Note

Aircraft Bank Angle

Link Semantic Value
Term Aircraft Bank Angle
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Definition

The recommended or required lateral inclination of the aircraft in the turn.

Definition Source

  • AIFDD

Note

There is no known note.

Aircraft Speed Reference

Link Semantic Value
Term Aircraft Speed Reference
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Definition

The reference system used for an aircraft speed value.

Definition Source

  • AIFDD

Note

There is no known note.

Altitude Description

Link Semantic Value
Term Altitude Description
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,

Synonyms

Speed Interpretation

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Definition

The applicable interpretation of the stated altitude.

Definition Source

  • AIFDD

Note

There is no known note.

Approach Minimum Visibility

Link Semantic Value
Term Approach Minimum Visibility
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Definition

The lowest prevailing visibility needed to land at the aerodrome when at the specified minimum altitude or height.

Definition Source

Aeronautical Information Feature Data Dictionary (AIFDD)

Note

The visibility value, observed in accordance with the definition of ""visibility"", which is reached or exceeded within at least half the horizon circle or within at least half of the surface of the aerodrome. These areas could comprise contiguous or non-contiguous sectors. This value may be assessed by human observation and/or instrumented systems. When instruments are installed, they are used to obtain the best estimate of the prevailing visibility.

Approach Prefix

Link Semantic Value
Term Approach Prefix
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Definition

A word or code placed at the beginning of the procedure name to denote a special application for the procedure.

Definition Source

  • AIFDD

Note

There is no known note.

Approach Type

Link Semantic Value
Term Approach Type
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Definition

The type of an Instrument Approach Procedure (IAP) based on the navigation equipment required.

Definition Source

Aeronautical Feature Data Dictionary (AIFDD)

Note

This will also form part of the procedure name.

Approach control office

Link Semantic Value
Term approach control office
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approach control service

approach control

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Abbreviation

APP

Definition

A unit established to provide air traffic control service to controlled flights arriving at, or departing from, one or more aerodromes.

Definition Source

ICAO, Official definition, ANNEX 2 Rules of the Air, 2005

Note

Approach control unit

Link Semantic Value
Term approach control unit
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approach control office

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Abbreviation

Definition

A unit established to provide air traffic control service to controlled flights arriving at, or departing from, one or more aerodromes.

Definition Source

ICAO, Official definition

ANNEX 3 Meteorological Service for International Air Navigation 2010

ANNEX 2 Rules of the Air 2005

Note

Approach procedure with vertical guidance

Link Semantic Value
Term approach procedure with vertical guidance
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localizer performance with vertical guidance (LPV)

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Narrower term


Abbreviation

APV

Definition

An Instrument Approach Procedure which utilizes lateral and vertical guidance but does not meet the requirements established for precision approach and landing operations.

Definition Source

Official definition, ICAO (2005), Annex 2, Rules of the Air

Note

Area Initial Angle

Link Semantic Value
Term Area Initial Angle
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Definition

A bearing that begins a clockwise arc.

Definition Source

  • AIFDD

Note

Used to define an area based on a center point plus two angles and two distances.

Area Inner Boundary Distance

Link Semantic Value
Term Area Inner Boundary Distance
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Definition

The distance from a specified center point to the inner boundary of an area.

Definition Source

  • AIFDD

Note

Used to define an area based on a center point plus two angles and two distances.

Area Minimum Altitude

Link Semantic Value
Term Area Minimum Altitude
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Abbreviation

AMA

Definition

The minimum altitude to be used under Instrument Meteorological Conditions (IMC) that provides a minimum obstacle clearance within a specified area.

Definition Source

Aeronautical Information Feature Data Dictionary (AIFDD), based on ICAO (2006), doc. 8168, Vol. I, Aircraft Operations

Note

The area is normally specified by a pair of geographic parallels and a pair of geographic meridians.

Area Outer Boundary Distance

Link Semantic Value
Term Area Outer Boundary Distance
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Definition

The distance from a specified center point to the outer boundary of an area.

Definition Source

  • AIFDD

Note

Used to define an area based on a center point plus two angles and two distances.

Area Terminating Angle

Link Semantic Value
Term Area Terminating Angle
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Definition

A bearing that ends a clockwise arc.

Definition Source

  • AIFDD

Note

Used to define an area based on a center point plus two angles and two distances.

Arrival Segment

Link Semantic Value
Term Arrival Segment
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Procedure Segment Leg

Broader term


Narrower term


Definition

The portion of an arrival route which aircraft may proceed from the en-route phase of flight to an initial approach fix.

Definition Source

  • AIFDD

Note

May be defined by one or more procedure segment legs.

Autoland approach

Link Semantic Value
Term autoland approach
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Abbreviation

Definition

a precision instrument approach to touchdown and, in some cases, through the landing rollout. An autoland approach is performed by the aircraft autopilot which is receiving position information and/or steering commands from onboard navigation equipment.

Definition Source

FAA, Pilot Controller Glossary (2010), URL:[1]

Note

Category I operation

Link Semantic Value
Term Category I operation
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Category II operation

Category IIIA operation

Category IIIB operation

Category IIIC operation

Broader term

Instrument Approach Procedure

Narrower term


Abbreviation

CAT I

Definition

A precision instrument approach and landing with:

a) a decision height not lower than 60 m (200 ft); and

b) with either a visibility not less than 800 m or a runway visual range not less than 550 m.

Definition Source

ICAO, Official definition:

ANNEX 6/I Operation of Aircraft — International Commercial Air Transport — Aeroplanes 2010

ANNEX 6/II Operation of Aircraft — International General Aviation — Aeroplanes 1998

ANNEX 6/III Operation of Aircraft — International Operations — Helicopters 2010

Note

Category II operation

Link Semantic Value
Term Category II operation
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Category I operation

Category IIIA operation

Category IIIB operation

Category IIIC operation

Broader term

Instrument Approach Procedure

Narrower term


Abbreviation

CAT II

Definition

A precision instrument approach and landing with:

a) a decision height lower than 60 m (200 ft), but not lower than 30 m (100 ft), and

b) a runway visual range not less than 300 m.

Definition Source

ICAO, Official definition:

ANNEX 6/I Operation of Aircraft — International Commercial Air Transport — Aeroplanes 2010

ANNEX 6/II Operation of Aircraft — International General Aviation — Aeroplanes 1998

ANNEX 6/III Operation of Aircraft — International Operations — Helicopters 2010

Note

Category IIIA operation

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Term Category IIIA operation
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Category I operation

Category II operation

Category IIIB operation

Category IIIC operation

Broader term

Instrument Approach Procedure

Narrower term


Abbreviation

CAT IIIA

Definition

A precision instrument approach and landing with:

a) a decision height lower than 30 m (100 ft) or no decision height; and

b) a runway visual range not less than 175 m.

Definition Source

ICAO, Official definition:

ANNEX 6/I Operation of Aircraft — International Commercial Air Transport — Aeroplanes 2010

ANNEX 6/II Operation of Aircraft — International General Aviation — Aeroplanes 1998

ANNEX 6/III Operation of Aircraft — International Operations — Helicopters 2010

Note

Category IIIB operation

Link Semantic Value
Term Category IIIB operation
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Category I operation

Category II operation

Category IIIA operation

Category IIIC operation

Broader term

Instrument Approach Procedure

Narrower term


Abbreviation

CAT IIIB

Definition

A precision instrument approach and landing with:

a) a decision height lower than 15 m (50 ft) or no decision height; and

b) a runway visual range less than 175 m but not less than 50 m.

Definition Source

ICAO, Official definition:

ANNEX 6/I Operation of Aircraft — International Commercial Air Transport — Aeroplanes 2010

ANNEX 6/II Operation of Aircraft — International General Aviation — Aeroplanes 1998

ANNEX 6/III Operation of Aircraft — International Operations — Helicopters 2010

Note

Category IIIC operation

Link Semantic Value
Term Category IIIC operation
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Mandatory for


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Category I operation

Category II operation

Category IIIA operation

Category IIIB operation

Broader term

Instrument Approach Procedure

Narrower term


Abbreviation

CAT IIIC

Definition

A precision instrument approach and landing with no decision height and no runway visual range limitations.

Definition Source

ICAO, Official definition:

ANNEX 6/I Operation of Aircraft — International Commercial Air Transport — Aeroplanes 2010

ANNEX 6/II Operation of Aircraft — International General Aviation — Aeroplanes 1998

ANNEX 6/III Operation of Aircraft — International Operations — Helicopters 2010

Note

Circling Procedure Identification

Link Semantic Value
Term Circling Procedure Identification
Status


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Definition

An identifier denoting a circling-only procedure specific to a radio navigation aid type at an aerodrome.

Definition Source

  • AIFDD

Note

The first circling only procedure at an airfield is denoted with an 'A', where there second is denoted with a 'B' and so on.

Closed path CDO procedures

Link Semantic Value
Term Closed path CDO procedures
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continuous descent operation (CDO)

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Abbreviation

Definition

Procedures coded with track to fix (TF) legs and fly-by waypoints. STARs that terminate with a link to an Instrument Approach Procedure should terminate at a fly-by waypoint. STARs that terminate with vector-based legs may be coded with fix to manual termination (FM) or heading to manual termination (VM) path terminators.

Definition Source

ICAO (2010) Doc 9931, Continuous Descent Operations (CDO) Manual

Note

Communication Failure Procedure

Link Semantic Value
Term Communication Failure Procedure
Status


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Synonyms

Communication Failure Description

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Definition

A textual specification of guidance to be followed in case of radio communication failure.

Definition Source

  • AIFDD

Note

There is no known note.

Continuous descent approach

Link Semantic Value
Term continuous descent approach
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continuous descent operation (CDO)

Broader term


Narrower term


Abbreviation

CDA

Definition

an aircraft operating technique in which an arriving aircraft descends from an optimal position with minimum thrust and avoids level flight to the extent permitted by the safe operation of the aircraft and compliance with published procedures and ATC instructions.

Definition Source

EUROCONTROL (2010) CDA Team

Note

CDA is a subset of the ICAO Continuous Descent Operations Concept (Doc 9931). The CDA definition may change once the ICAO CDO definition is finalised.


NB: The term 'level flight’ required to fulfil this definition should be locally determined for performance monitoring.

Continuous descent operation

Link Semantic Value
Term continuous descent operation
Status


Mandatory for


Contexts

SESAR

Categories


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continuous descent approach (CDA)

Broader term


Narrower term


Abbreviation

CDO

Definition

An operation, enabled by airspace design, procedure design and ATC facilitation, in which an arriving aircraft descends continuously, to the greatest possible extent, by employing minimum engine thrust, ideally in a low drag configuration, prior to the final approach fix /final approach point.

Definition Source

1. ICAO (2010) Doc 9931, Continuous Descent Operations (CDO) Manual

2. SESAR Concept of Operations Step 2 Edition 2014 (Ed. 01.01.00)

Note

1.— An optimum CDO starts from the top of descent and uses descent profiles that reduce , segments of level flight, noise, fuel burn, emissions and controller/pilot communications, while increasing predictability to pilots and controllers and flight stability.

2.— A CDO initiated from the highest possible level in the enroute or arrival phases of flight will achieve the maximum reduction in fuel burn, noise, and emissions.

Lexicon Release

Lexicon Release 2015.1

Copter Final Approach Course

Link Semantic Value
Term Copter Final Approach Course
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Definition

The final approach track for a helicopter procedure.

Definition Source

Aeronautical Feature Data Dictionary (AIFDD)

Note

Whole degrees in three numeric characters, for example: '030', '120', '127'.

Course Reversal Description

Link Semantic Value
Term Course Reversal Description
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Definition

Instructions for reversing course on an Instrument Approach Procedure (IAP).

Definition Source

  • AIFDD

Note

There is no known note.

Course Type

Link Semantic Value
Term Course Type
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Definition

A descriptor of the aircraft course to be flown.

Definition Source

  • AIFDD

Note

For example: True Track, Magnetic Track, heading, VOR radial, True Bearing, or Magnetic Bearing.

Critical segment

Link Semantic Value
Term critical segment
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Missed Approach

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Abbreviation

Definition

A segment where an unguided discontinued approach/missed approach would expose the aircraft to an obstacle.

Definition Source

ICAO, Official definition, ANNEX 10/I Aeronautical Telecommunications — Radio Navigation Aids 1996, 5th ed., Amdt. 71, p. 197

Note

Decision Altitude

Link Semantic Value
Term Decision Altitude
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Abbreviation

  • DA

Definition

A specified altitude in reference to Mean Sea Level (MSL) in an approach with vertical guidance at which a missed approach must be initiated if the required visual references to continue the approach have not been established.

Definition Source

  • AIFDD

Note

Decision Height

Link Semantic Value
Term Decision Height
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Abbreviation

  • DH

Definition

A specified height in reference to the threshold elevation in the precision approach or approach with vertical guidance at which a missed approach must be initiated if the required visual reference to continue the approach has not been established.

Definition Source

  • AIFDD

Note

There is no known note.

Departure Segment

Link Semantic Value
Term Departure Segment
Status


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Definition

The portion of a departure route between the runway and the first en-route segment.

Definition Source

  • AIFDD

Note

May be defined by one or more procedure segment legs.

Duplicate Procedure Identification

Link Semantic Value
Term Duplicate Procedure Identification
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Mandatory for


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Multiple Identification

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Definition

A suffix letter for denoting multiple approaches of the same approach type to the same runway.

Definition Source

  • AIFDD

Note

A single letter suffix, starting with the letter Z, following the radio navigation aid type shall be used if two or more procedures to the same runway cannot be distinguished by the radio navigation aid type only.

Emergency Safe Altitude

Link Semantic Value
Term Emergency Safe Altitude
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Abbreviation

  • ESA

Definition

An altitude which provides at least 1000 feet of obstacle clearance in nonmountainous areas or 2000 feet of obstacle clearance in designated mountainous areas within a 100 nautical mile radius of the navigation facility upon which the procedure is predicated.

Definition Source

  • AIFDD

Note

There is no known note.

Final Approach Alignment

Link Semantic Value
Term Final Approach Alignment
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Definition

A visual manoeuvre used to properly bring the aircraft into position for landing at final approach.

Definition Source

Aeronautical Feature Data Dictionary (AIFDD)

Note

Final Approach Descent Angle

Link Semantic Value
Term Final Approach Descent Angle
Status


Mandatory for


Contexts


Categories


Synonyms

Vertical Path Angle, Precison Approach Glide Path Angle

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Broader term


Narrower term


Definition

A descent profile prescribed for vertical guidance during a final approach.

Definition Source

Aeronautical Feature Data Dictionary (AIFDD)

Note

There is no known note.

Final Approach Segment

Link Semantic Value
Term Final Approach Segment
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Mandatory for


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Definition

That segment of an Instrument Approach Procedure (IAP) in which alignment and descent for landing are accomplished.

Definition Source

ICAO (2008), Official definition, PANS-OPS (Procedures for Air Navigation Services)

Aeronautical Information Feature Data Dictionary (AIFDD)

Note

May be defined by one or more procedure segment legs.

Geodesic Distance

Link Semantic Value
Term Geodesic Distance
Status


Mandatory for


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Synonyms

Rho

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Definition

The geodesic distance to a geographic point or location.

Definition Source

  • AIFDD

Note

Geodesic distance is the shortest distance between any two points on a mathematically defined ellipsoidal surface.

Height Above Aerodrome

Link Semantic Value
Term Height Above Aerodrome
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Abbreviation

  • HAA

Definition

The vertical distance between the published aerodrome elevation and the Minimum Descent Altitude (MDA).

Definition Source

  • AIFDD

Note

The Height Above Aerodrome (HAA) applies to circling minima.

Height Above Landing

Link Semantic Value
Term Height Above Landing
Status


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Abbreviation

  • HAL

Definition

The vertical distance between the designated helicopter landing area and the Decision Altitude (DA) for precision approaches, or the Minimum Descent Altitude (MDA) for non-precision approaches.

Definition Source

  • AIFDD

Note

There is no known note.

Height Above Surface

Link Semantic Value
Term Height Above Surface
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Abbreviation

  • HAS

Definition

The vertical distance between the highest terrain/surface within a 5200 feet radius of the Missed Approach Point (MAP) and the Minimum Descent Altitude (MDA).

Definition Source

  • AIFDD

Note

The Height Above Surface (HAS) applies to point-in-space (PinS) procedures.

Height Above Touchdown

Link Semantic Value
Term Height Above Touchdown
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Abbreviation

  • HAT

Definition

The vertical distance between the touchdown zone elevation and the Decision Altitude (DA) for precision approaches, or the Minimum Descent Altitude (MDA) for non-precision approaches.

Definition Source

  • AIFDD

Note

The Height Above Touchdown (HAT) applies to straight-in minima.

Helicopter Performance Class

Link Semantic Value
Term Helicopter Performance Class
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Definition

The class of a helicopter based on its performance during a critical power unit failure after take-off.

Definition Source

  • AIFDD

Note

There is no known note.

Holding Procedure

Link Semantic Value
Term Holding Procedure
Status


Mandatory for


Contexts


Categories


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Narrower term


Definition

A predetermined manoeuvre which keeps an aircraft within a specified airspace while awaiting further clearance.

Definition Source

ICAO (2006), Official Definition, PANS-OPS (Procedures for Air Navigation Services)

Aeronuatical Information Feature Data Dictionary (AIFDD)

Note

Holding Procedure Description

Link Semantic Value
Term Holding Procedure Description
Status


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Narrower term


Definition

A textual description of the holding procedure.

Definition Source

  • AIFDD

Note

There is no known note.

Holding Procedure Inbound Course

Link Semantic Value
Term Holding Procedure Inbound Course
Status


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Definition

The radial, course or bearing to the holding fix on which the holding pattern is based.

Definition Source

  • AIFDD

Note

The outbound course is the reciprocal (opposite direction) of the inbound course.

Holding Procedure Length

Link Semantic Value
Term Holding Procedure Length
Status


Mandatory for


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Narrower term


Definition

The longitudinal extent of the inbound leg of the holding pattern.

Definition Source

  • AIFDD

Note

There is no known note.

Holding Procedure Lower Limit

Link Semantic Value
Term Holding Procedure Lower Limit
Status


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Definition

The minimum holding procedure altitude or flight level allowed for all aircraft categories at all defined speeds.

Definition Source

  • AIFDD

Note

There is no known note.

Holding Procedure Time

Link Semantic Value
Term Holding Procedure Time
Status


Mandatory for


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Narrower term


Definition

The length of time that the aircraft should maintain track on the inbound leg of the holding pattern.

Definition Source

Aeronautical Information Feature Data Dictionary (AIFDD)

Note

Standard inbound leg times are: 1 minute if at or below 4250 metres (14,000 feet), 1.5 minutes if above 4250 metres (14,000 feet).

Holding Procedure Type

Link Semantic Value
Term Holding Procedure Type
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Definition

The applicable phase of flight for the specified holding procedure.

Definition Source

Aeronautical Information Feature Data Dictionary (AIFDD)

Note

For example: en-route holding, or terminal area holding.

Holding Procedure Upper Limit

Link Semantic Value
Term Holding Procedure Upper Limit
Status


Mandatory for


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Definition

The maximum holding procedure altitude or flight level allowed for all aircraft categories at all defined speeds.

Definition Source

Aeronautical Information Feature Data Dictionary (AIFDD)

Note

ICAO Path Terminator Type

Link Semantic Value
Term ICAO Path Terminator Type
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Definition

A specific type of flight path along a segment of a procedure along with a specific type of termination of that flight path, as specified by the International Civil Aviation Organization (ICAO).

Definition Source

  • AIFDD

Note

Path terminators are assigned to all RNAV, SID, STAR and approach procedure segments in an airborne navigation database, and are defined in PANS-OPS Volume 2, Chapter 5.

Initial Approach Segment

Link Semantic Value
Term Initial Approach Segment
Status


Mandatory for


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Narrower term


Definition

That segment of an Instrument Approach Procedure between the Initial Approach Fix and the intermediate fix or, where applicable, the Final Approach Fix or point.

Definition Source

ICAO (2009), Annex 4, Aeronautical Charts (11th edition), official term and definition

Note

May be defined by one or more procedure segment legs. (source: Aeronautical Information Feature Data Dictionary)

Instrument Approach Procedure

Link Semantic Value
Term Instrument Approach Procedure
Status


Mandatory for


Contexts

EAEA

Categories


Synonyms


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Broader term


Narrower term


Abbreviation

  • IAP

Definition

A series of predetermined manoeuvres by reference to flight instruments with specified protection from obstacles from the initial approach fix, or where applicable, from the beginning of a defined arrival route to a point from which a landing can be completed and thereafter, if a landing is not completed, to a position at which holding or en-route obstacle clearance criteria apply.

Definition Source

ICAO, Official definition, Annex 2 (Rules of the Air) and 4 (Aeronautical Charts), PANS-OPS/I and PANS-OPS/II


Aeronautical Information Feature Data Dictionary (AIFDD)

Note

Instrument approach procedures are classified as follows: 1. Non-precision approach (NPA) procedure: An instrument approach procedure which utilizes lateral guidance but does not utilize vertical guidance; 2. Approach procedure with vertical guidance (APV): An instrument procedure which utilizes lateral and vertical guidance but does not meet the requirements established for precision approach and landing operations; 3. Precision approach (PA) procedure: An instrument approach procedure using precision lateral and vertical guidance with minima as determined by the category of operation. Note that lateral and vertical guidance refers to the guidance provided either by: a) a ground-based navigation aid; or b) computer-generated navigation data.

Instrument Approach Procedure Fix Role

Link Semantic Value
Term Instrument Approach Procedure Fix Role
Status


Mandatory for


Contexts


Categories


Synonyms

IAP Fix Role

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Definition

The function of a significant point within an Instrument Approach Procedure (IAP).

Definition Source

  • AIFDD

Note

For example: initial approach fix, final approach fix, or missed approach point.

Instrument Procedure Additional Equipment

Link Semantic Value
Term Instrument Procedure Additional Equipment
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Mandatory for


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Narrower term


Definition

The equipment needed to fly the instrument procedure in addition to that stated in the procedure name.

Definition Source

  • AIFDD

Note

There is no known note.

Instrument flight procedure

Link Semantic Value
Term instrument flight procedure
Status


Mandatory for


Contexts

SESAR

Categories


Synonyms

sometimes referred to as "procedure"

Related entries

Instrument Approach Procedure (IAP)

Broader term


Narrower term


Abbreviation

IFP

Definition

A description of a series of predetermined flight manoeuvres by reference to flight instruments, published by electronic and/or printed means.

Definition Source

ICAO, doc. 9906 The Quality Assurance Manual for Flight Procedure Design, Vol. 1: Flight Procedure Design Quality Assurance System

Note

UK Directorate of Airspace Policy, CAP 785: "Approval Requirements for Instrument Flight Procedures for Use in UK Airspace" gives examples: Instrument Flight Procedure (IFP) – A standard instrument arrival, an instrument approach procedure, or a standard instrument departure.

Lexicon Release

Lexicon Release 2015.2

Intermediate Approach

Link Semantic Value
Term Intermediate Approach
Status


Mandatory for


Contexts

SESAR

Categories


Synonyms


Related entries


Broader term


Narrower term


Abbreviation

Definition

The downwind, base and intercept approach path segments for positioning and turning on to merge on to final approach ending at the interception of the final approach localiser and glideslope.

Definition Source

SESAR doc. 06.08.01 Operational Concept Description (OCD) and Operational Service and Environment Definition (OSED) for Time Based Separation for Arrivals (TBS)

Note

Intermediate Approach Segment

Link Semantic Value
Term Intermediate Approach Segment
Status


Mandatory for


Contexts


Categories


Synonyms


Related entries

Initial Approach Segment

Broader term


Narrower term


Definition

That segment of an Instrument Approach Procedure (IAP) between either the intermediate fix and the final approach fix or point, or between the end of a reversal, racetrack or dead reckoning track procedure and the final approach fix or point, as appropriate.

Definition Source

ICAO (2001) Official definition, Annex 4, Aeronautical Charts

Note

May be defined by one or more procedure segment legs.

Lead Radial

Link Semantic Value
Term Lead Radial
Status


Mandatory for


Contexts


Categories


Synonyms


Related entries


Broader term


Narrower term


Definition

A radial or bearing which provides the appropriate lead distance to assist in turning onto the next segment of an Instrument Approach Procedure (IAP).

Definition Source

  • AIFDD

Note

There is no known note.

Leg Separation

Link Semantic Value
Term Leg Separation
Status


Mandatory for


Contexts


Categories


Synonyms


Related entries


Broader term


Narrower term


Definition

The distance between the two parallel segments of a Refuel anchor pattern.

Definition Source

Aeronautical Information Feature Data Dictionary (AIFDD)

Note

Magnetic Bearing

Link Semantic Value
Term Magnetic Bearing
Status


Mandatory for


Contexts


Categories

,

Synonyms


Related entries


Broader term


Narrower term


Definition

The horizontal direction (bearing) of an object or point measured clockwise from Magnetic North up to, but not including, 360 arc degrees.

Definition Source

  • AIFDD

Note

There is no known note.

Magnetic Bearing (Theta)

Link Semantic Value
Term Magnetic Bearing (Theta)
Status


Mandatory for


Contexts


Categories


Synonyms


Related entries


Broader term


Narrower term


Definition

The magnetic bearing to a geographic point or location.

Definition Source

  • AIFDD

Note

There is no known note.

Magnetic Track

Link Semantic Value
Term Magnetic Track
Status


Mandatory for


Contexts


Categories

,

Synonyms


Related entries


Broader term


Narrower term


Definition

The projection on the Earth's surface of the path of an aircraft, the direction of which path at any point is expressed in arc degrees from Magnetic North, as published by the appropriate authority.

Definition Source

  • AIFDD

Note

There is no known note.

MergeStrip tool

Link Semantic Value
Term MergeStrip tool
Status


Mandatory for


Contexts


Categories


Synonyms


Related entries

continuous descent operation (CDO)

Point Merge

Broader term


Narrower term


Abbreviation

Definition

a tool designed to assist controllers in CDO sequencing and separation.

Definition Source

EUROCONTROL (2013) 3rd European CDO Workshop, Report and Actions

Note

The essence of the MergeStrip concept is that, in an extended environment, a dynamic system can be used to create relative spacing instead of a static map element with fixed lateral flight path.

...

MergeStrip components:

•Common route, for example final

•Merge points

•Relative Spacing Tool (here: plots on an imaginary centre line)

•High level concept of operation

•delaying manoeuvre if necessary (speed control or vectoring)

•using FMS capabilities, optimised flying towards one of the merge points

•speed control for maintaining relative spacing


Note Source

SESAR Joint Undertaking (2013) news [2]


Military Minimum Procedure Height

Link Semantic Value
Term Military Minimum Procedure Height
Status


Mandatory for


Contexts


Categories


Synonyms


Related entries


Broader term


Narrower term


Definition

The minimum decision height or decision altitude for use by the military for certain instrument landing procedures.

Definition Source

  • AIFDD

Note

There is no known note.

Military Minimum Procedure Visibility

Link Semantic Value
Term Military Minimum Procedure Visibility
Status


Mandatory for


Contexts


Categories


Synonyms


Related entries


Broader term


Narrower term


Definition

The minimum prevailing visibility for use by the military for certain instrument landing procedures.

Definition Source

  • AIFDD

Note

There is no known note.

Minimum Altitude

Link Semantic Value
Term Minimum Altitude
Status


Mandatory for


Contexts


Categories

,

Synonyms


Related entries


Broader term


Narrower term


Definition

The lowest altitude, height or flight level authorized by the designated authority for aircraft operations.

Definition Source

  • AIFDD

Note

When specified, the minimum altitude overrides the vertical lower limit, in those parts of the airspace where the vertical lower limit is situated below the minimum altitude.

Minimum Climb Gradient

Link Semantic Value
Term Minimum Climb Gradient
Status


Mandatory for


Contexts


Categories


Synonyms


Related entries


Broader term


Narrower term


Definition

The minimum climb profile required to ensure vertical clearance.

Definition Source

  • AIFDD

Note

There is no known note.

Minimum Descent Altitude

Link Semantic Value
Term Minimum Descent Altitude
Status


Mandatory for


Contexts


Categories


Synonyms


Related entries


Broader term


Narrower term


Abbreviation

MDA

Definition

A specified minimum altitude in reference to Mean Sea Level (MSL) in a non-precision approach or circling approach below which descent must not be made without the required visual reference.

Definition Source

Aeronautical Information Feature Data Dictionary (AIFDD)

Note

Minimum Descent Height

Link Semantic Value
Term Minimum Descent Height
Status


Mandatory for


Contexts


Categories


Synonyms


Related entries


Broader term


Narrower term


Abbreviation

  • MDH

Definition

A specified minimum height in a non-precision approach or circling approach below which descent must not be made without the required visual reference.

Definition Source

  • AIFDD

Note

Minimum Descent Height (MDH) is referenced to the aerodrome elevation or to the threshold elevation if that is more than 2 metres (7 feet) below the aerodrome elevation. A minimum descent height for a circling approach is referenced to the aerodrome elevation.

Minimum Eye Height Over Threshold

Link Semantic Value
Term Minimum Eye Height Over Threshold
Status


Mandatory for


Contexts


Categories


Synonyms


Related entries


Broader term


Narrower term


Abbreviation

  • MEHT

Definition

The minimum height of the aircraft cockpit over the threshold when the aircraft glideslope indicator is showing an on-slope indication.

Definition Source

Aeronautical Information Feature Data Dictionary (AIFDD)

Note

Minimum Radio Altimeter Height

Link Semantic Value
Term Minimum Radio Altimeter Height
Status


Mandatory for


Contexts


Categories


Synonyms

Radio Altitude, RA, Radio Height, RH

Related entries


Broader term


Narrower term


Definition

The specified vertical distance above the surface as measured by a radio altimeter at which a missed approach procedure must be initiated if the visual reference required in order to continue the approach has not been established.

Definition Source

  • AIFDD

Note

Applies to Category II approaches.

Minimum Sector Altitude

Link Semantic Value
Term Minimum Sector Altitude
Status


Mandatory for


Contexts


Categories


Synonyms


Related entries


Broader term


Narrower term


Abbreviation

MSA

Definition

The lowest altitude which may be used which will provide a minimum clearance of 300 metres (1000 feet) above all objects located in the area contained within a sector of a circle of 46 kilometres (25 nautical miles) radius centered on a radio navigation aid or waypoint.

Definition Source

Aeronautical Information Feature Data Dictionary (AIFDD)

adapted from ICAO (2010) Annex 10, Meteorological Service for International Air Navigation

Note

Minimum safe approach speed

Link Semantic Value
Term minimum safe approach speed
Status


Mandatory for


Contexts


Categories
Synonyms

minimum approach speed

Related entries


Broader term


Narrower term


Abbreviation

Definition

the minimum speed an aircraft can maintain with its flaps extended. This speed value is mostly used during approaches and can also be requested by controllers in order to maintain safe aircraft separation.

Definition Source

Olympic Air Virtual [3]

Note

Missed Approach Segment

Link Semantic Value
Term Missed Approach Segment
Status


Mandatory for


Contexts


Categories


Synonyms


Related entries

Procedure Segment Leg

Broader term


Narrower term


Definition

The missed approach segment begins at the missed approach point, missed approach waypoint, or the point upon arrival at decision height, and ends at the specified missed approach NAVAID, intersection, fix or waypoint, as appropriate at the minimum Instrument Flight Rules (IFR) altitude.

Definition Source

Aeronautical Information Feature Data Dictionary (AIFDD)

Note

May be defined by one or more procedure segment legs.

Monitored approach

Link Semantic Value
Term monitored approach
Status


Mandatory for


Contexts


Categories


Synonyms

shared approach

Related entries


Broader term


Narrower term


Abbreviation

Definition

a specific procedure for pilot task sharing. It involves one pilot flying (or managing) the aircraft on approach exclusively ‘head down’ by reference to the flight instruments whilst the other monitors.

Definition Source

SKYBRARY, reference database for aviation safety knowledge[4]

Note

Not later than the approach of the applicable DA/DH or MDA/MDH, the monitoring pilot seeks visual external references so that when the ‘head-down’ pilot calls “Decide”, they are in a position to make a prompt and unequivocal call of either call “Land” or "Go-Around". If the call is “Go Around”, the head-down pilot flies the prescribed or ad hoc cleared Missed Approach and the monitoring pilot continues in that role. If the call is “Land”, the pilot who has been monitoring and has made that call takes over as PF and continues to the landing. If visual reference should be lost below DA/MDA then the pilot who has taken over as PF must commence the go around before handing over to the other pilot at a suitable point during the climb-out.


The monitored approach has sometimes been described as a “delegated” approach compared to the description of the traditional approach, where the both a landing and a go around are flown by the pilot who made the approach, which has been called an “assisted” approach. (same source)

Non-Standard Holding Reason

Link Semantic Value
Term Non-Standard Holding Reason
Status


Mandatory for


Contexts


Categories


Synonyms


Related entries


Broader term


Narrower term


Definition

A statement specifying the reason that the holding procedure does not employ standard length, time, and/or turns.

Definition Source

  • AIFDD

Note

There is no known note.

Non-precision approach

Link Semantic Value
Term non-precision approach
Status


Mandatory for


Contexts


Categories


Synonyms


Related entries

precision approach

Broader term


Narrower term


Abbreviation

NPA

Definition

an instrument approach and landing which utilises lateral guidance but does not utilise vertical guidance. (ICAO Annex 6) For pilots of older aircraft, in which use of automated systems to assist in flying the approach is limited, a high degree of piloting skill is required to fly such approaches accurately and the frequent practice which many pilots need to achieve this can be difficult to come by if precision approaches are the normal method used

Definition Source

EASA (2013) European Aviation Safety Plan 2013-2016

Note

"Approaches made using barometric altitude, termed non-precision approaches, require a minimum descent altitude above the local terrain that ensures that there is no risk of collision with the terrain." source: ICAO (2006)PANS-OPS/II [Doc 8168/II]

Obstacle Clearance Altitude

Link Semantic Value
Term Obstacle Clearance Altitude
Status


Mandatory for


Contexts


Categories

,

Synonyms


Related entries


Broader term


Narrower term


Abbreviation

  • OCA

Definition

The lowest altitude in reference to Mean Sea Level that is used in establishing compliance with appropriate obstacle clearance criteria.

Definition Source

  • AIFDD

Note

There is no known note.

Obstacle Clearance Height

Link Semantic Value
Term Obstacle Clearance Height
Status


Mandatory for


Contexts


Categories

,

Synonyms


Related entries


Broader term


Narrower term


Abbreviation

  • OCH

Definition

The lowest height above the elevation of the relevant runway threshold or the aerodrome elevation as applicable, used in establishing compliance with appropriate obstacle clearance criteria.

Definition Source

  • AIFDD

Note

Obstacle clearance height is referenced to the threshold elevation or in the case of non-precision approaches to the aerodrome elevation or the threshold elevation if that is more than 2 metres (7 feet) below the aerodrome elevation. An obstacle clearance height for a circling approach is referenced to the aerodrome elevation.

Precision approach

Link Semantic Value
Term non-precision approach
Status


Mandatory for


Contexts


Categories


Synonyms


Related entries

non-precision approach

precision approach (PA) procedure

Broader term


Narrower term


Abbreviation

PA

Definition

An approach in which range, azimuth, and glide slope information are provided to the pilot.

Definition Source

US Department of Defense (2005) Dictionary of Military and Associated Terms

Note

Precision approach (PA) procedure

Link Semantic Value
Term Precision approach (PA) procedure
Status


Mandatory for


Contexts


Categories


Synonyms


Related entries

non-precision approach

precision approach

Broader term


Narrower term


Abbreviation

PA

Definition

1. An instrument approach procedure using precision lateral and vertical guidance with minima as determined by the category of operation.

Note.— Lateral and vertical guidance refers to the guidance provided either by:

a) a ground-based navigation aid; or

b) computer generated navigation data.

Definition Source

ICAO (2006), Official definition, PANS-OPS/I, Procedures for Air Navigation Services — Aircraft Operations — Flight Procedures [Doc 8168/I]

Note

Procedure Altitude or Height

Link Semantic Value
Term Procedure Altitude or Height
Status


Mandatory for


Contexts


Categories


Synonyms


Related entries


Broader term


Narrower term


Definition

A specified altitude/height flown operationally at or above the minimum altitude/height and established to accommodate a stabilized descent at a prescribed descent gradient/angle in the intermediate/final approach segment.

Definition Source

  • AIFDD

Note

There is no known note.

Procedure Description

Link Semantic Value
Term Procedure Description
Status


Mandatory for


Contexts


Categories


Synonyms

Arrival Route Description, Departure Route Description, IAP Description, SID Description, STAR Description

Related entries


Broader term


Narrower term


Definition

A textual description of a visual or instrument flight procedure, or segment thereof, which may include arrivals and departures.

Definition Source

  • AIFDD

Note

Information should include, but not be limited to routing, heading, altitude and contact information.

Procedure Design Criteria

Link Semantic Value
Term Procedure Design Criteria
Status


Mandatory for


Contexts


Categories


Synonyms


Related entries


Broader term


Narrower term


Definition

The set of rules used to design and evaluate visual and/or instrument flight procedures.

Definition Source

  • AIFDD

Note

There is no known note.

Procedure Designator

Link Semantic Value
Term Procedure Designator
Status


Mandatory for


Contexts


Categories


Synonyms

SID Designator, STAR Designator, OID Designator, IAP Designator

Related entries


Broader term


Narrower term


Definition

A limited series of characters by which the flight procedure is identified in electronic systems.

Definition Source

  • AIFDD

Note

The designator is a shortened form of the procedure identification, in accordance with the appropriate organisational naming convention.

Procedure Identification

Link Semantic Value
Term Procedure Identification
Status


Mandatory for


Contexts


Categories


Synonyms

Procedure Name

Related entries


Broader term


Narrower term


Definition

The official identification of the flight procedure as established in accordance with the appropriate naming convention.

Definition Source

  • AIFDD

Note

Examples of the naming convention are specified in PANS-OPS Doc. 8168, Vol. 2, Part 1, Section 4, Chapter 9.

Procedure Lower Limit

Link Semantic Value
Term Procedure Lower Limit
Status


Mandatory for


Contexts


Categories


Synonyms


Related entries


Broader term


Narrower term


Definition

The minimum allowed altitude for the flight procedure segment.

Definition Source

  • AIFDD

Note

There is no known note.

Procedure Segment Altitude

Link Semantic Value
Term Procedure Segment Altitude
Status


Mandatory for


Contexts


Categories


Synonyms


Related entries


Broader term


Narrower term


Definition

The specified altitude for use with any flight procedure segment.

Definition Source

  • AIFDD

Note

There is no known note.

Procedure Segment Course

Link Semantic Value
Term Procedure Segment Course
Status


Mandatory for


Contexts


Categories


Synonyms

Course Angle, Track Angle

Related entries


Broader term


Narrower term


Definition

The radial, course or bearing from the starting point to the end point of the flight procedure segment.

Definition Source

  • AIFDD

Note

There is no known note.

Procedure Segment Leg

Link Semantic Value
Term Procedure Segment Leg
Status


Mandatory for


Contexts

EAEA

Categories


Synonyms

Segment Leg

Related entries


Broader term


Narrower term


Definition

A part of an instrument or visual flight procedure defined by two consecutive significant points.

Definition Source

Aeronautical Information Feature Data Dictionary (AIFDD)

Note

Procedure Segment Length

Link Semantic Value
Term Procedure Segment Length
Status


Mandatory for


Contexts


Categories


Synonyms


Related entries


Broader term


Narrower term


Definition

The longitudinal extent of a flight procedure segment.

Definition Source

  • AIFDD

Note

There is no known note.

Procedure Segment Time

Link Semantic Value
Term Procedure Segment Time
Status


Mandatory for


Contexts


Categories


Synonyms


Related entries


Broader term


Narrower term


Definition

The length of time the aircraft should maintain track on the flight procedure segment.

Definition Source

  • AIFDD

Note

There is no known note.

Procedure Speed Limit

Link Semantic Value
Term Procedure Speed Limit
Status


Mandatory for


Contexts


Categories


Synonyms


Related entries


Broader term


Narrower term


Definition

The maximum speed of the aircraft permitted for a particular flight procedure route or segment.

Definition Source

  • AIFDD

Note

There is no known note.

Procedure Transition Segment

Link Semantic Value
Term Procedure Transition Segment
Status


Mandatory for


Contexts


Categories


Synonyms

Arrival Feeder

Related entries


Broader term


Narrower term


Definition

A segment on which aircraft proceed directly from the en-route phase of flight to an initial approach fix.

Definition Source

  • AIFDD

Note

May be defined by one or more procedure segment legs.

Procedure Turn Required

Link Semantic Value
Term Procedure Turn Required
Status


Mandatory for


Contexts


Categories


Synonyms


Related entries


Broader term


Narrower term


Definition

A Boolean indicating if a flight procedure turn is required at the end of the segment.

Definition Source

  • AIFDD

Note

A procedure turn is a manoeuvre in which a turn is made away from a designated track followed by a turn in the opposite direction to permit the aircraft to intercept and proceed along the reciprocal of the designated track. Note 1: Procedure turns are designated 'left' or 'right' according to the direction of the initial turn. Note 2: Procedure turns may be designated as being made either in level flight or while descending, according to the circumstances of each individual procedure.

Procedure Upper Limit

Link Semantic Value
Term Procedure Upper Limit
Status


Mandatory for


Contexts


Categories


Synonyms


Related entries


Broader term


Narrower term


Definition

The maximum allowed altitude for the flight procedure segment.

Definition Source

Aeronautical Information Feature Data Dictionary (AIFDD)

Note

Reverse Magnetic Track

Link Semantic Value
Term Reverse Magnetic Track
Status


Mandatory for


Contexts


Categories

,

Synonyms


Related entries


Broader term


Narrower term


Definition

The projection on the Earth's surface of the reciprocal of the path of an aircraft, the direction of which path at any point is expressed in degrees from Magnetic North, as published by the appropriate authority.

Definition Source

  • AIFDD

Note

There is no known note.

Reverse True Track

Link Semantic Value
Term Reverse True Track
Status


Mandatory for


Contexts


Categories

,

Synonyms


Related entries


Broader term


Narrower term


Definition

The projection on the Earth's surface of the reciprocal of the path of an aircraft, the direction of which path at any point is expressed in degrees from True North, as published by the appropriate authority.

Definition Source

  • AIFDD

Note

There is no known note.

Runway Visual Range

Link Semantic Value
Term Runway Visual Range
Status


Mandatory for


Contexts


Categories


Synonyms


Related entries


Broader term


Narrower term


Abbreviation

  • RVR

Definition

An instrumentally derived value, based on standard calibrations, that represents the range over which the pilot of an aircraft on the centre line of a runway can see the runway surface markings or the lights delineating the runway or identifying its centre line.

Definition Source

Aeronautical Information Feature Data Dictionary (AIFDD)

Note

The runway visual range is based on the sighting of either high intensity runway lights or on the visual contrast of other targets, whichever yields the greater visual range.

Safe Altitude Area

Link Semantic Value
Term Safe Altitude Area
Status


Mandatory for


Contexts


Categories


Synonyms


Related entries


Broader term


Narrower term


Definition

A defined area with applicable minimum altitude providing a minimum required clearance above all objects located in the area for a defined terminal procedure(s).

Definition Source

  • AIFDD

Note

There is no known note.

Stabilised approach

Link Semantic Value
Term stabilised approach
Status


Mandatory for


Contexts


Categories


Synonyms


Related entries

Instrument Meteorological Conditions (IMC)

Visual Meteorological Conditions (VMC)

Broader term


Narrower term


Abbreviation

Definition

"An approach is stabilized only if all the criteria in company standard operating procedures (SOPs) are met before or when reaching the applicable minimum stabilization height."

Definition Source

Flight Safety Foundation (FSF), doc. FSF ALAR Briefing Note 7.1. Stabilized approach [5]

Note

"The following minimum stabilization heights are recommended to achieve a stabilized approach:

- 1,000 feet above airport elevation in instrument meteorological conditions (IMC); or;

- 500 feet above airport elevation in visual meteorological conditions (VMC).

At the minimum stabilization height and below, a call should be made by the pilot not flying/pilot monitoring (PNF/PM) if any flight parameter exceeds the established criteria.

Any time an approach is not stabilized at the minimum stabilization height or becomes unstabilized below the minimum stabilization height, a go-around should be conducted."

Standard Instrument Arrival

Link Semantic Value
Term Standard Instrument Arrival
Status


Mandatory for


Contexts

EAEA

Categories


Synonyms


Related entries

Standard Instrument Departure (SID)

Broader term


Narrower term


Abbreviation

STAR

Definition

A designated Instrument Flight Rule (IFR) arrival route linking a significant point, normally on an Air Traffic Service (ATS) route, with a point from which a published instrument approach procedure can be commenced.

Definition Source

ICAO,Official definition added to PANS-OPS/1 by Amdt 9 (1996)

Note

Standard Instrument Departure

Link Semantic Value
Term Standard Instrument Departure
Status


Mandatory for


Contexts

EAEA, SESAR

Categories


Synonyms


Related entries

Standard Instrument Arrival (STAR)

Broader term


Narrower term


Abbreviation

SID

Definition

1) A procedure by which a departure route is designated following the Instrument Flight Rules (IFR).

2) A designated instrument flight rule (IFR) departure route linking the aerodrome or a specified runway of the aerodrome with a specified significant point, normally on a designated ATS route, at which the en-route phase of a flight commences.

Definition Source

1) AIFDD (Aeronautical Information Feature Data Dictionary)

2) ICAO, Official definition, DOC 9613 Manual on Required Navigation Performance (RNP) 2008, 3rd ed., p. I-(xxi)

Note

The Standard Instrument Departure (SID) represents the departure route of the aircraft to the ACC entry point.

Lexicon Release

Lexicon Release 2016.1

Terminal Arrival Altitude

Link Semantic Value
Term Terminal Arrival Altitude
Status


Mandatory for


Contexts


Categories


Synonyms

Terminal Arrival Area

Related entries


Broader term


Narrower term


Abbreviation

  • TAA

Definition

The lowest altitude that will provide a minimum clearance of 300 metres (1000 feet) above all objects located in an arc of a circle defined by a 46 kilometre (25 nautical mile) radius centered on the initial approach fix (IAF), or where there is no IAF then centered on the intermediate approach fix (IF), delimited by straight lines joining the extremity of the arc to the IAF/IF.

Definition Source

  • AIFDD

Note

The combined TAAs associated with an approach procedure shall account for an area of 360 arc degrees around the IF. Terminal Arrival Areas may be provided for RNAV approaches to facilitate descent and entry to the procedure. TAAs are associated with an RNAV procedure based upon the 'T' or 'Y' Arrangement. The Basic 'T' approach segment configuration is the standard configuration for transition from the en route to the terminal environment. The standard arrangement consists of three TAAs: straight-in, right base, and left base.

Terminal Arrival Altitude Area Type

Link Semantic Value
Term Terminal Arrival Altitude Area Type
Status


Mandatory for


Contexts


Categories


Synonyms

TAA Area Type

Related entries


Broader term


Narrower term


Definition

The type of Terminal Arrival Altitude (TAA) area which is contained by an arc defined by the extension of the initial legs and the intermediate segment course based upon the arrangement of an Area Navigation (RNAV) procedure.

Definition Source

  • AIFDD

Note

TAAs are associated with an RNAV procedure based upon the 'T' or 'Y' Arrangement. The Basic T approach segment configuration is the standard configuration for transition from the en route to the terminal environment. The standard arrangement consists of three TAAs: straight-in, right and left base.

Terminal Arrival Altitude Sector

Link Semantic Value
Term Terminal Arrival Altitude Sector
Status


Mandatory for


Contexts


Categories


Synonyms

Terminal Arrival Area Sector

Related entries


Broader term


Narrower term


Abbreviation

  • TAA Sector

Definition

A subdivision of the Terminal Arrival Altitude (TAA) to allow for one or more minimum altitudes.

Definition Source

  • AIFDD

Note

The lowest altitude will provide a minimum clearance of 300 metres (1000 feet) above all objects located in the sector.

Threshold Crossing Height

Link Semantic Value
Term Threshold Crossing Height
Status


Mandatory for


Contexts


Categories


Synonyms

Reference Datum Height, RDH

Related entries


Broader term


Narrower term


Abbreviation

TCH

Definition

The height above the Runway Threshold at which the computed glide path crosses the threshold.

Definition Source

Aeronautical Information Feature Data Dictionary (AIFDD)

Note

True Bearing

Link Semantic Value
Term True Bearing
Status


Mandatory for


Contexts


Categories

,

Synonyms


Related entries


Broader term


Narrower term


Definition

The horizontal direction of an object or point measured clockwise from True North up to, but not including, 360 degrees.

Definition Source

  • AIFDD

Note

The Magnetic Bearing added to the Magnetic Variation equals the True Bearing.

True Track

Link Semantic Value
Term True Track
Status


Mandatory for


Contexts


Categories

,

Synonyms


Related entries


Broader term


Narrower term


Definition

The projection on the Earth's surface of the path of an aircraft, the direction of which path at any point is expressed in arc degrees from True North, as published by the appropriate authority.

Definition Source

  • AIFDD

Note

There is no known note.

Turn Direction

Link Semantic Value
Term Turn Direction
Status


Mandatory for


Contexts


Categories

,

Synonyms


Related entries


Broader term


Narrower term


Definition

The applicable direction of the aircraft turn.

Definition Source

  • AIFDD

Note

For example: left or right.