FullDescription:NAVAIDS, Landing Aids, Points and/or Obstacles

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Absolute Horizontal Accuracy (95%)

Link Semantic Value
Term Absolute Horizontal Accuracy (95%)
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Geographical Accuracy

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Narrower term


Definition

The difference between the recorded horizontal coordinates of a feature and its true position referenced to the same geodetic datum expressed as a circular error at 95 percent probability.

Definition Source

  • AIFDD

Note

It may also be applied to a data set. If the data contains multiple accuracies, usually the worst accuracy which applies to 10% or more of the data is recorded. Circular error probability (CEP) is the radius of a circle within which a stated percentage of measurements for a given point will fall. For example, if the horizontal accuracy of a surveyed point is stated as one metre with 95 percent CEP, then 95 percent of measurements of the position of this point will fall within a circle of one metre radius. The true position is then estimated to lie at the centre of this circle.

Absolute Vertical Accuracy (95%)

Link Semantic Value
Term Absolute Vertical Accuracy (95%)
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Mandatory for


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Elevation Accuracy

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Narrower term


Definition

The difference between the recorded elevation of a feature and its true elevation referenced to the same vertical datum expressed as a linear error at 95 percent probability.

Definition Source

  • AIFDD

Note

It may also be applied to a data set. If the data contains multiple accuracies, usually the worst accuracy which applies to 10% or more of the data is recorded. Linear error probability (LEP) is the linear magnitude within which a stated percentage of measurements for a given point will fall. For example, if the vertical accuracy of a surveyed point is stated as one metre with 95 percent LEP, then 95 percent of measurements of the height of this point will fall along a vertical line of length one metre. The true position is then estimated to lie at the centre of this vertical line.

Active reflector

Link Semantic Value
Term active reflector
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Moving Target Detector

Moving Target Indicator

Doppler shift

Broader term


Narrower term


Abbreviation

Definition

(Radar) A device used in primary radar systems for geographical alignment and system performance checking. It generates a signal from a fixed installation with an artificial Doppler shift, which ensures that a fixed target will be presented on a ATC screen after Moving Target Detection or Moving Target Indicator processing.

Definition Source

EUROCONTROL (2010), SASS-C Glossary, [1]

Note

Active waypoint

Link Semantic Value
Term active waypoint
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Mandatory for


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Broader term

way-point (waypoint)

Narrower term


Abbreviation

Definition

A way-point [sic] to or from which navigational guidance is being provided. For a parallel offset, the active way-point may or may not be at the same geographical position as the parent way-point. When not in the parallel offset mode (operating on the parent route), the active and parent way-points are at the same geographical position.

Definition Source

ICAO - GNSSP/2-WP/87 (Version 4.0) - p.1A-42

Note

Adjacent track

Link Semantic Value
Term adjacent track
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ATM Surveillance Tracker and Server (ARTAS)

Broader term


Narrower term


Abbreviation

AT

Definition

Track provided to an ARTAS Unit by one of its adjacent Units.

Definition Source

EUROCONTROL EATMP Glossary, June 2001

Note

Aerodrome Approach Lighting System Type

Link Semantic Value
Term Aerodrome Approach Lighting System Type
Status


Mandatory for


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Broader term

airport lighting

Narrower term


Definition

The type of aerodrome lighting system providing visual guidance during the final segment leg of an approach procedure.

Definition Source

  • AIFDD

Note

Aeronautical Obstacle Light Present

Link Semantic Value
Term Aeronautical Obstacle Light Present
Status


Mandatory for


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Synonyms

Obstacle Lighted

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Narrower term


Definition

An indication that an obstacle that constitutes a danger to air navigation is marked by a light or lights.

Definition Source

  • AIFDD

Note

Aeronautical Radio Navigation Service

Link Semantic Value
Term Aeronautical Radio Navigation Service
Status


Mandatory for


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Narrower term


Definition

A service providing aeronautical navigation guidance information or position data, intended for the benefit and safe operation of aircraft.

Definition Source

  • AIFDD

Note

Aeronautical Radio Navigation Service Checkpoint

Link Semantic Value
Term Aeronautical Radio Navigation Service Checkpoint
Status


Mandatory for


Contexts


Categories


Synonyms

Checkpoint

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Narrower term


Definition

A point established and marked on the surface of an aerodrome where the checking of a navigation system can be accomplished.

Definition Source

  • AIFDD

Note

Aeronautical Radio Navigation Service Identifier

Link Semantic Value
Term Aeronautical Radio Navigation Service Identifier
Status


Mandatory for


Contexts


Categories


Synonyms

NAVAID Identifier

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Narrower term


Definition

A published sequence of alpha characters allowing the identification of the radio navigation service.

Definition Source

  • AIFDD

Note

Aeronautical Radio Navigation Service Name

Link Semantic Value
Term Aeronautical Radio Navigation Service Name
Status


Mandatory for


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Broader term


Narrower term


Definition

The textual designation given to a feature by a responsible authority.

Definition Source

  • AIFDD

Note

Air Route Surveillance Radar

Link Semantic Value
Term Air Route Surveillance Radar
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Mandatory for


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Air route traffic control center (ARTCC)

airport surveillance radar (ASR)

Broader term


Narrower term


Abbreviation

ARSR

Definition

1. Air route traffic control center (ARTCC) radar used primarily to detect and display an aircraft's position while en route between terminal areas. The ARSR enables controllers to provide radar air traffic control service when aircraft are within the ARSR coverage. In some instances, ARSR may enable an ARTCC to provide terminal radar services similar to but usually more limited than those provided by a radar approach control.


2. "...a system of long-range radar designed to provide a display of aircraft operating over a large area, especially en route aircraft flying the airways."

Definition Source

1. FAA (2010) Pilot/Controller Glossary, [2]

2. "Airport Engineering" (Ashford/Wright) 3rd ed. 1992

Note

Airport and Airways Surveillance Radar

Link Semantic Value
Term Airport and Airways Surveillance Radar
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Mandatory for


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Abbreviation

AASR

Definition

A medium range radar designed for both airway and airport surveillance applications.

Definition Source

Transport Canada, "TP 14371 - Transport Canada Aeronautical Information Manual (TC AIM)", GEN 5.1 Glossary of Aeronautical Terms [3]

Note

Airport surveillance radar

Link Semantic Value
Term airport surveillance radar
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Mandatory for


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Air Route Surveillance Radar (ARSR)

Broader term


Narrower term


Abbreviation

ASR

Definition

Approach control radar used to detect and display an aircraft's position in the terminal area. ASR provides range and azimuth information but does not provide elevation data. Coverage of the ASR can extend up to 60 miles.

Definition Source

FAA (2010) Pilot/Controller Glossary [4]

Note

Altimetry-aiding

Link Semantic Value
Term altimetry-aiding
Status


Mandatory for


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Synonyms

altimetry aiding

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Abbreviation

Definition

The process of using altitude data to simulate a GNSS satellite directly over the receiver antenna (i.e. it reduces, by one, the number of satellites required for a given function).

Definition Source

ICAO, doc. GNSSP/2 Rep. p. 1A-42; CIR 267 1996, p. 97

Note

Angle Reference Type

Link Semantic Value
Term Angle Reference Type
Status


Mandatory for


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Narrower term


Definition

The navigational reference system on which the measurement of an angle is based.

Definition Source

Aeronautical Information Feature Data Dictionary (AIFDD)

Note

Angle of Radar Reflector

Link Semantic Value
Term Angle of Radar Reflector
Status


Mandatory for


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Definition

The angular distance measured from True North clockwise to the reflective side of the radar reflector.

Definition Source

  • AIFDD

Note

Approach Lighting System

Link Semantic Value
Term Approach Lighting System
Status


Mandatory for


Contexts

EAEA

Categories


Synonyms


Related entries


Broader term

airport lighting

Narrower term


Abbreviation

ALS

Definition

An airport lighting facility which provides visual guidance to landing aircraft by radiating light beams in a directional pattern by which the pilot aligns the aircraft with the final approach path for landing.

Definition Source

Aeronautical Information Exchange Model (AIXM), version 5.1

Aeronautical Information Feature Data Dictionary (AIFDD)

Note

Automatic direction finder

Link Semantic Value
Term automatic direction finder
Status


Mandatory for


Contexts


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Non-Directional Radio Beacon (NDB)

Magnetic Bearing

Broader term


Narrower term


Abbreviation

ADF

Definition

An aircraft radio navigation system which senses and indicates the direction to a L/MF nondirectional radio beacon (NDB) ground transmitter. Direction is indicated to the pilot as a magnetic bearing or as a relative bearing to the longitudinal axis of the aircraft depending on the type of indicator installed in the aircraft. In certain applications, such as military, ADF operations may be based on airborne and ground transmitters in the VHF/UHF frequency spectrum.

Definition Source

FAA (2010) Pilot/Controller Glossary [5]

Note

Azimuth change pulses

Link Semantic Value
Term Azimuth change pulses
Status


Mandatory for


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Synonyms

Azimuth count pulses

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Narrower term


Abbreviation

Definition

The output pulses of the incremental azimuth measuring device fitted to the radar antenna turning platform (turning gear).

Definition Source

EUROCONTROL, SASS-C Glossary

Note

The encoding device may give its output in serial or parallel form, but typically provides 4096 pulses (12 bit encoding), 16 384 pulses (14 bit encoding) or 65 536 pulses (16 bit encoding) in serial form per 360° of azimuth rotation.

Azimuth extension

Link Semantic Value
Term '
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Azimuth change pulses (ACP)

Broader term


Narrower term


Abbreviation

Definition

The azimuth increment, often expressed as a number of ACPs, from detection of the leading edge of a radar plot to detection of the trailing edge of that plot, in a digital plot extractor system.

Definition Source

EUROCONTROL, SASS-C Glossary

Note

Backcourse Localizer Use Type

Link Semantic Value
Term Backcourse Localizer Use Type
Status


Mandatory for


Contexts


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Synonyms

back course localizer use type

Related entries

back course

Broader term


Narrower term


Definition

The usability of the localizer signal in the direction opposite of the primary localizer course.

Definition Source

  • Aeronautical Information Feature Data Dictionary (AIFDD)

Note

Beacon

Link Semantic Value
Term beacon
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Mandatory for


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Broader term


Narrower term

radio beacon

radar beacon

Abbreviation

Definition

"(a) A light, group of lights, electronic apparatus, or other device that guides, orients, or warns aircraft, spacecraft, etc., in flight.

(b) A structure, building, or station where such a device is mounted or located."

Definition Source

NATO: NORTH ATLANTIC TREATY ORGANIZATION, Advisory Group for Aerospace Research and Development (AGARD/NATO) (1980), "Agard Multilingual Aeronautical Dictionary", Second Edition, London

Note

Beacon Minor Axis Bearing

Link Semantic Value
Term Beacon Minor Axis Bearing
Status


Mandatory for


Contexts


Categories


Synonyms

Axis Bearing

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Broader term


Narrower term


Definition

The bearing of the minor axis of the marker beacon with respect to True North.

Definition Source

  • AIFDD

Note

Carrier Frequency

Link Semantic Value
Term Carrier Frequency
Status


Mandatory for


Contexts


Categories

,

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Definition

The number of cycles per second of a carrier wave used for radio transmission.

Definition Source

Aeronautical Information Feature Data Dictionary (AIFDD)

Note

The frequency is measured in Hertz (Hz), Megahertz (MHz), or Kilohertz (kHz). The value is tuned-in by using the transmitter and/or the receiver.

Compass Locator

Link Semantic Value
Term Compass Locator
Status


Mandatory for


Contexts


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Synonyms

NDB Class Locator

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Narrower term


Definition

A low or medium powered Non-Directional Beacon (NDB) used as an aid for final approach.

Definition Source

  • AIFDD

Note

A locator usually has an average radius of rated coverage of between 18.5 and 46.3 kilometres (10 and 25 nautical miles).

Controlling Obstacle

Link Semantic Value
Term Controlling Obstacle
Status


Mandatory for


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Definition

An indication that the obstacle is the highest obstacle relative to a prescribed plane within a specified area, upon which the aeronautical procedure is predicated.

Definition Source

  • AIFDD

Note

Data Link Channel

Link Semantic Value
Term Data Link Channel
Status


Mandatory for


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Controller-pilot data link communications (CPDLC)

Broader term

data link

Narrower term


Definition

The communication channel on which Controller-Pilot Data-Link Communication (CPDLC) is available.

Definition Source

Aeronautical Information Feature Data Dictionary (AIFDD)

Note

Data Link Enabled

Link Semantic Value
Term Data Link Enabled
Status


Mandatory for


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Controller-pilot data link communications (CPDLC)

Broader term

data link

Narrower term


Definition

An indication that a Controller-Pilot Data-Link Communication (CPDLC) is available in support of the service.

Definition Source

Aeronautical Information Feature Data Dictionary (AIFDD)

Note

Data Link Logon Address

Link Semantic Value
Term Data Link Logon Address
Status


Mandatory for


Contexts


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Synonyms


Related entries


Broader term

data link

Narrower term


Definition

A specified code used for data link logon to an Air Traffic Service (ATS) unit.

Definition Source

Aeronautical Information Feature Data Dictionary (AIFDD)

Note

Designated Point

Link Semantic Value
Term Designated Point
Status


Mandatory for


Contexts


Categories


Synonyms


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Broader term


Narrower term


Definition

A named geographical location not marked by the site of a radio navigation aid, used in defining an Air Traffic Service (ATS) route, the flight path of an aircraft and/or for other navigation or ATS purposes.

Definition Source

  • AIFDD

Note

Designated Point Identifier

Link Semantic Value
Term Designated Point Identifier
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Mandatory for


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Broader term

Designated Point

Narrower term


Definition

A set of five alpha-numeric characters used to identify a designated point.

Definition Source

  • AIFDD

Note

Designated Point Type

Link Semantic Value
Term Designated Point Type
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Mandatory for


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Broader term

Designated Point

Narrower term


Definition

The specific type of designated point whether published by the State, published by the ICAO, or created by another agency for convenience of identification.

Definition Source

Aeronautical Information Feature Data Dictionary (AIFDD)

Note

Distance Measuring Equipment

Link Semantic Value
Term Distance Measuring Equipment
Status


Mandatory for


Contexts

EAEA

Categories


Synonyms


Related entries


Broader term


Narrower term


Abbreviation

  • DME

Definition

Ultra High Frequency (UHF) ground equipment that is used in conjunction with airborne equipment to determine distance between the airborne and ground equipment.

Definition Source

Aeronautical Information Exchange Model (AIXM), version 5.1

Aeronautical Information Feature Data Dictionary (AIFDD)

Note

DME Distance is defined as the line of sight distance (slant range) from the source of a DME signal to the receiving antenna. DME operates on the interrogation-answer principle where the time required for the round trip of the signal exchange is measured in the airborne DME unit and translated into DME Distance.

Distance Measuring Equipment Antenna Elevation

Link Semantic Value
Term Distance Measuring Equipment Antenna Elevation
Status


Mandatory for


Contexts


Categories


Synonyms

DME Antenna Elevation

Related entries


Broader term

Distance Measuring Equipment

Narrower term


Definition

The vertical distance from Mean Sea Level (MSL) to the base of the Distance Measuring Equipment (DME) antenna.

Definition Source

  • AIFDD

Note

Distance Measuring Equipment Channel

Link Semantic Value
Term Distance Measuring Equipment Channel
Status


Mandatory for


Contexts


Categories


Synonyms

DME Channel

Related entries


Broader term

Distance Measuring Equipment

Narrower term


Definition

A number followed by a letter corresponding to the DME frequency, as per ICAO Annex 10, Chapter 3, Table A.

Definition Source

  • AIFDD

Note

DME operating channels shall be chosen from ICAO Annex 10 Chapter 3 Table A, which specifies 352 channels for each of which there is an assigned channel number, frequency, and pulse code.

Distance Measuring Equipment Displacement

Link Semantic Value
Term Distance Measuring Equipment Displacement
Status


Mandatory for


Contexts


Categories


Synonyms

DME Displacement

Related entries


Broader term

Distance Measuring Equipment

Narrower term


Definition

The distance from the DME antenna to the position where the zero range indication occurs in the DME receiver.

Definition Source

  • AIFDD

Note

Distance Measuring Equipment Type

Link Semantic Value
Term Distance Measuring Equipment Type
Status


Mandatory for


Contexts


Categories


Synonyms

DME Type

Related entries


Broader term

Distance Measuring Equipment

Narrower term


Definition

The particular spectrum characteristics or accuracy of Ultra High Frequency (UHF) Distance Measuring Equipment (DME), as a category.

Definition Source

  • AIFDD

Note

For example: DME/N, DME/W, or DME/P.

Elevation

Link Semantic Value
Term Elevation
Status


Mandatory for


Contexts


Categories


Synonyms

Orthometric Height

Related entries


Broader term


Narrower term



Abbreviation

Definition

The vertical distance of a point or a level, on or affixed to the surface of the Earth, measured from Mean Sea Level (MSL).

Definition Source

Aeronautical Information Feature Data Dictionary (AIFDD)

ICAO (2010) Annex 3, Meteorological Service for International Air Navigation

Note

Ellipsoid Height

Link Semantic Value
Term Ellipsoid Height
Status


Mandatory for


Contexts


Categories

,

Synonyms


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Broader term


Narrower term


Abbreviation

  • HAE

Definition

The height related to a reference ellipsoid, measured along the ellipsoidal outer normal through the point in question.

Definition Source

  • AIFDD

Note

There is no known note.

Estimated Elapsed Time

Link Semantic Value
Term Estimated Elapsed Time
Status


Mandatory for


Contexts


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Significant Point

Broader term


Narrower term


Abbreviation

EET

Definition

The estimated time required to proceed from one significant point to another.

Definition Source

ICAO, Official definition, PANS-ATM Procedures for Air Navigation Services — Air Traffic Management [Doc 4444] 2001, 14th ed. (Amdt 3, 29/06/2004)

Note

Flight Director

Link Semantic Value
Term '
Status


Mandatory for


Contexts


Categories


Synonyms


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Broader term


Narrower term


Abbreviation

Definition

a navigational aid that is overlaid on the attitude indicator that shows the pilot of an aircraft the attitude required to follow a certain trajectory.

Definition Source

SKYBRARY, reference tool for aviation safety knowledge [6]

Note

The flight director computes and displays the proper pitch and bank angles required in order for the aircraft to follow a selected path.

The FD is generally used in direct connection with the Autopilot, where the FD commands the AP to put the aircraft in the attitude necessary to follow a trajectory. The FD/AP combination is typically used in autopilot coupled instrument approaches such as CAT II and CAT III ILS instrument approaches. (same source)

Fly-by waypoint

Link Semantic Value
Term fly-by waypoint
Status


Mandatory for


Contexts


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Related entries

flyover waypoint

Broader term

way-point

Narrower term


Abbreviation

Definition

A waypoint which requires turn anticipation to allow tangential interception of the next segment of a route or procedure.

Definition Source

ICAO, Official definition added to PANS-OPS/I by Amdt 10 (05/11/1998)

Note

Flyover waypoint

Link Semantic Value
Term flyover waypoint
Status


Mandatory for


Contexts


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Related entries

fly-by waypoint

Broader term

way-point

Narrower term


Abbreviation

Definition

A waypoint at which a turn is initiated in order to join the next segment of a route or procedure.

Definition Source

ICAO, Official definition added to PANS-OPS/I by Amdt 10 (05/11/1998)

Note

GNSS Channel

Link Semantic Value
Term GNSS Channel
Status


Mandatory for


Contexts


Categories


Synonyms


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Broader term


Narrower term


Definition

The operating channel of Global Navigation Satellite System (GNSS) electronic transceiving equipment.

Definition Source

  • AIFDD

Note

There is no known note.

GNSS Constellation

Link Semantic Value
Term GNSS Constellation
Status


Mandatory for


Contexts


Categories


Synonyms


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Broader term


Narrower term


Definition

The identification of a group of satellites used for navigation, providing Global Navigation Satellite System (GNSS) capabilities under a common authority.

Definition Source

  • AIFDD

Note

There is no known note.

Geoid Undulation

Link Semantic Value
Term Geoid Undulation
Status


Mandatory for


Contexts


Categories


Synonyms


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Broader term


Narrower term


Definition

The distance of the geoid above (positive) or below (negative) the mathematical reference ellipsoid.

Definition Source

  • AIFDD

Note

In respect to the World Geodetic System 1984 (WGS-84) defined ellipsoid, the difference between the WGS-84 ellipsoidal height and orthometric height is the WGS-84 geoid undulation.

Ghost Frequency

Link Semantic Value
Term Ghost Frequency
Status


Mandatory for


Contexts


Categories


Synonyms

Paired Frequency

Related entries


Broader term


Narrower term


Definition

The frequency of the system which operates with vertical polarization in the frequency band of 960 to 1215 megahertz (MHz).

Definition Source

  • AIFDD

Note

The interrogation and reply frequencies are assigned with one MHz spacing between channels.

Global Navigation Satellite System

Link Semantic Value
Term Global Navigation Satellite System
Status


Mandatory for


Contexts


Categories


Synonyms


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Broader term


Narrower term

aircraft-based augmentation system (ABAS)

GLONASS

Satellite Based Augmentation System (SBAS)

ground-based augmentation system (GBAS)

Abbreviation

  • GNSS

Definition

A wide area service based on a satellite constellation providing radio frequency signals which can be used by airborne equipment to determine the aircraft's two-dimensional position, or depending upon the capabilities of the system, a three-dimensional position.

Definition Source

Aeronautical Information Feature Data Dictionary (AIFDD)

Note

For example: GLONASS, GPS, WAAS, or EGNOS.

Highest Elevation

Link Semantic Value
Term Highest Elevation
Status


Mandatory for


Contexts


Categories

,

Synonyms


Related entries


Broader term


Narrower term


Definition

The elevation from a specified vertical datum to the highest point on a feature.

Definition Source

  • AIFDD

Note

There is no known note.

Instrument Landing System

Link Semantic Value
Term Instrument Landing System
Status


Mandatory for


Contexts


Categories


Synonyms


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Broader term


Narrower term


Abbreviation

ILS

Definition

A combination of radio navigation services intended to facilitate aircraft in landing by providing lateral and vertical guidance including indications of distance from the optimum point of landing.

Definition Source

Aeronautical Information Feature Data Dictionary (AIFDD)

Note

A precision instrument approach system which normally consists of the following electronic components and visual aids: localizer, glide slope, outer marker, middle marker, and approach lights.

Instrument Landing System Facility Performance Category

Link Semantic Value
Term Instrument Landing System Facility Performance Category
Status


Mandatory for


Contexts


Categories


Synonyms

ILS Facility Performance Category

Related entries


Broader term


Narrower term


Definition

The category of the operations indicating the precision required for defined decision heights and visibility requirements.

Definition Source

  • AIFDD

Note

For example: CAT I, CAT II, or CAT III.

Instrument Landing System Glide Path

Link Semantic Value
Term Instrument Landing System Glide Path
Status


Mandatory for


Contexts


Categories


Synonyms

ILS Glide Path

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Broader term


Narrower term


Definition

A component of an Instrument Landing System (ILS) consisting of an Ultra High Frequency (UHF) transmitter radiating signals and providing a straight-line descent path in the vertical plane containing the center line of the runway served by the ILS, and thereby furnishing descent information down to the surface of the runway.

Definition Source

  • AIFDD

Note

The descent information is that locus of points in the vertical plane containing the runway centre line at which the receiver indicator deflection is zero.

Instrument Landing System Glide Path Angle

Link Semantic Value
Term Instrument Landing System Glide Path Angle
Status


Mandatory for


Contexts


Categories


Synonyms

Slope Angle, ILS Glide Path Angle

Related entries


Broader term


Narrower term


Definition

The angle between a straight line which represents the mean of the Instrument Landing System (ILS) glide path and the horizontal plane at the base of the glide slope antenna.

Definition Source

  • AIFDD

Note

There is no known note.

Instrument Landing System Localizer

Link Semantic Value
Term Instrument Landing System Localizer
Status


Mandatory for


Contexts

EAEA

Categories


Synonyms

ILS Localizer

Related entries


Broader term


Narrower term


Definition

A component of an ILS consisting of a VHF transmitter, radiating signals in the direction served by the ILS, and providing a straight line azimuth path in the horizontal plane containing the centre line of the runway.

Definition Source

Aeronautical Information Feature Data Dictionary (AIFDD)

Note

Instrument Landing System Reference Datum Height

Link Semantic Value
Term Instrument Landing System Reference Datum Height
Status


Mandatory for


Contexts


Categories


Synonyms

ILS Reference Datum Height

Related entries


Broader term


Narrower term


Definition

The height of a point that is located above the intersection of the runway centre line and the threshold and through which the downward extended straight portion of the glide path passes.

Definition Source

  • AIFDD

Note

There is no known note.

Intermediate point

Link Semantic Value
Term intermediate point
Status


Mandatory for


Contexts

EAEA

Categories


Synonyms


Related entries

Significant Point

Broader term


Narrower term


Abbreviation

Definition

A specific kind of point of the trajectory that represents no significant point, only a point that will be overflown.

These points can serve for other modules, like the conflict detection.

Definition Source

EUROCONTROL/EUROCAE (2006) FLIGHT OBJECT INTEROPERABILITY PROPOSED STANDARD (FOIPS) STUDY, FOIPS D7, Document Reference: FOIPS_MOD-D7-MsWord Issue 1.4 Released

Note

Light System Intensity

Link Semantic Value
Term Light System Intensity
Status


Mandatory for


Contexts


Categories


Synonyms


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Broader term


Narrower term


Definition

The intensity level of the aerodrome lighting system.

Definition Source

  • AIFDD

Note

For example: high, medium, or low.

Light System Intensity Variability

Link Semantic Value
Term Light System Intensity Variability
Status


Mandatory for


Contexts


Categories


Synonyms


Related entries


Broader term


Narrower term


Definition

The variability of the intensity of an aerodrome lighting system.

Definition Source

  • AIFDD

Note

For example: fixed.

Localizer Course Width

Link Semantic Value
Term Localizer Course Width
Status


Mandatory for


Contexts


Categories


Synonyms


Related entries


Broader term


Narrower term


Definition

The angle of the localizer signal originating from the localizer equipment.

Definition Source

  • AIFDD

Note

There is no known note.

Localizer performance with vertical guidance

Link Semantic Value
Term localizer performance with vertical guidance
Status


Mandatory for


Contexts


Categories


Synonyms


Related entries

approach procedure with vertical guidance (APV)

Broader term


Narrower term


Abbreviation

LPV

Definition

The label to denote minima lines associated with APV-1 or APV-II performance on approach charts.

Definition Source

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

Note

Magnetic Variation

Link Semantic Value
Term Magnetic Variation
Status


Mandatory for


Contexts


Categories

,

Synonyms


Related entries


Broader term


Narrower term


Abbreviation

  • MagVar

Definition

The angular difference between True North and Magnetic North measured at a given position and date.

Definition Source

  • AIFDD

Note

The value given indicates whether the angular difference is East (positive) or West (negative) of True North. True North is the direction of the northern point at which the geographic meridian lines meet.

Magnetic Variation Date

Link Semantic Value
Term Magnetic Variation Date
Status


Mandatory for


Contexts


Categories

,

Synonyms


Related entries


Broader term


Narrower term


Definition

The date on which the magnetic variation was measured.

Definition Source

  • AIFDD

Note

There is no known note.

Marker Radio Beacon

Link Semantic Value
Term Marker Radio Beacon
Status


Mandatory for


Contexts

EAEA

Categories


Synonyms

marker beacon

Related entries


Broader term


Narrower term


Abbreviation

MKR

Definition

A radio navigation service identifying a particular location in space by means of a 75 megahertz (MHz) transmitter which transmits a directional signal to be received by aircraft flying overhead.

Definition Source

Aeronautical Information Feature Data Dictionary (AIFDD)

Note

For example: fan, 'Z', or compass locator.

Marker Radio Beacon Class

Link Semantic Value
Term Marker Radio Beacon Class
Status


Mandatory for


Contexts


Categories


Synonyms

Marker Position

Related entries


Broader term


Narrower term


Definition

The class of a radio marker beacon based on the shape and power of its signal.

Definition Source

  • AIFDD

Note

For example: a fan marker, a low-powered fan marker, or a Z marker.

Marker Radio Beacon Type

Link Semantic Value
Term Marker Radio Beacon Type
Status


Mandatory for


Contexts


Categories


Synonyms


Related entries


Broader term


Narrower term


Definition

The type of a radio marker beacon based upon distances and frequency modulation, as measured on the Instrument Landing System (ILS) glide path and localizer course line.

Definition Source

  • AIFDD

Note

For example: outer, middle, or inner.

Maximum Elevation Figure

Link Semantic Value
Term Maximum Elevation Figure
Status


Mandatory for


Contexts


Categories


Synonyms


Related entries


Broader term


Narrower term


Abbreviation

  • MEF

Definition

The highest elevation of terrain or vertical obstacles within a quadrant bounded by lines of geographic longitude (meridians) and geographic latitude (parallels).

Definition Source

  • AIFDD

Note

Maximum elevation figures are shown over land masses as well as over open water areas containing man-made obstacles such as oil rigs.

Microwave Landing System

Link Semantic Value
Term Microwave Landing System
Status


Mandatory for


Contexts


Categories


Synonyms


Related entries


Broader term


Narrower term


Abbreviation

MLS

Definition

A precision approach and landing guidance system operating in the microwave spectrum, which provides position information and various ground-to-air data.

Definition Source

Aeronautical Information Feature Data Dictionary (AIFDD)

Note

The position information is provided in a wide coverage sector and is determined by an azimuth angle, elevation, and distance.

Microwave Landing System Azimuth

Link Semantic Value
Term Microwave Landing System Azimuth
Status


Mandatory for


Contexts


Categories


Synonyms

MLS Azimuth

Related entries


Broader term


Narrower term


Definition

A component of a Microwave Landing System (MLS) consisting of a Super High Frequency (SHF) transmitter radiating signals to provide lateral indications to aircraft approaching the runway.

Definition Source

  • Aeronautical Information Feature Data Dictionary (AIFDD)

Note

The lateral information is the locus of points in any horizontal plane where the decoded guidance angle is constant. SHF is the frequency band between 3 and 30 gigahertz (GHz). The elevation and azimuth stations of the Microwave Landing System operate from 5031 to 5091 megahertz (MHz) in this spectrum.

Microwave Landing System Channel

Link Semantic Value
Term Microwave Landing System Channel
Status


Mandatory for


Contexts


Categories


Synonyms

MLS Channel

Related entries


Broader term


Narrower term


Definition

A number corresponding to the Microwave Landing System (MLS) frequency, as per ICAO Annex 10, Chapter 3, Table A.

Definition Source

  • AIFDD

Note

The MLS angle and data functions shall operate on any one of the 200 channels assigned in the frequencies from 5031.0 to 5090.7 megahertz (MHz) as shown in ICAO Annex 10, Chapter 3, Table A.

Microwave Landing System Elevation

Link Semantic Value
Term Microwave Landing System Elevation
Status


Mandatory for


Contexts


Categories


Synonyms

MLS Elevation

Related entries


Broader term


Narrower term


Definition

A component of a Microwave Landing System (MLS) consisting of an Super High Frequency (SHF) transmitter radiating signals to provide vertical indications as an angular value to aircraft approaching the runway.

Definition Source

  • AIFDD

Note

The vertical information is the locus of points in any vertical plane where the decoded guidance angle is constant. SHF is the frequency band between 3 and 30 gigahertz (GHz). The elevation and azimuth stations of the Microwave Landing System operate from 5031 to 5091 megahertz (MHz) in this spectrum.

Microwave Landing System Left Angle of Coverage

Link Semantic Value
Term Microwave Landing System Left Angle of Coverage
Status


Mandatory for


Contexts


Categories


Synonyms

MLS Left Angle of Coverage

Related entries


Broader term


Narrower term


Definition

The value of the angle from the zero indication direction within which the Microwave Landing System (MLS) azimuth indication is usable, and leftwards of this direction from the azimuth antenna.

Definition Source

  • AIFDD

Note

There is no known note.

Microwave Landing System Left Angle of Proportionality

Link Semantic Value
Term Microwave Landing System Left Angle of Proportionality
Status


Mandatory for


Contexts


Categories


Synonyms

MLS Left Angle of Proportionality

Related entries


Broader term


Narrower term


Definition

The value of the angle within which the Microwave Landing System (MLS) azimuth indication is proportional to the angular displacement from the azimuth zero indication direction, and leftwards of this direction from the azimuth antenna.

Definition Source

  • AIFDD

Note

There is no known note.

Microwave Landing System Minimum Angle

Link Semantic Value
Term Microwave Landing System Minimum Angle
Status


Mandatory for


Contexts


Categories


Synonyms

MLS Minimum Angle

Related entries


Broader term


Narrower term


Definition

The value of the lowest elevation angle authorized for a Microwave Landing System (MLS) procedure.

Definition Source

  • AIFDD

Note

There is no known note.

Microwave Landing System Nominal Angle

Link Semantic Value
Term Microwave Landing System Nominal Angle
Status


Mandatory for


Contexts


Categories


Synonyms

MLS Nominal Angle

Related entries


Broader term


Narrower term


Definition

The angle between a straight line which represents the mean of the Microwave Landing System (MLS) glide path and the horizontal plane at the base of the MLS elevation component.

Definition Source

  • AIFDD

Note

There is no known note.

Microwave Landing System Right Angle of Coverage

Link Semantic Value
Term Microwave Landing System Right Angle of Coverage
Status


Mandatory for


Contexts


Categories


Synonyms

MLS Right Angle of Coverage

Related entries


Broader term


Narrower term


Definition

The value of the angle from the zero indication direction within which the Microwave Landing System (MLS) azimuth indication is usable, and rightwards of this direction from the azimuth antenna.

Definition Source

  • AIFDD

Note

There is no known note.

Microwave Landing System Right Angle of Proportionality

Link Semantic Value
Term Microwave Landing System Right Angle of Proportionality
Status


Mandatory for


Contexts


Categories


Synonyms

MLS Right Angle of Proportionality

Related entries


Broader term


Narrower term


Definition

The value of the angle within which the Microwave Landing System (MLS) azimuth indication is proportional to the angular displacement from the azimuth zero indication direction, and rightwards of this direction from the azimuth antenna.

Definition Source

  • AIFDD

Note

There is no known note.

Microwave Landing System Span Angle

Link Semantic Value
Term Microwave Landing System Span Angle
Status


Mandatory for


Contexts


Categories


Synonyms

MLS Span Angle

Related entries


Broader term


Narrower term


Definition

The value of the angle between the lower and upper limits in which the elevation component of the Microwave Landing System (MLS) is operating.

Definition Source

  • AIFDD

Note

There is no known note.

Microwave Landing System Unit Association Type

Link Semantic Value
Term Microwave Landing System Unit Association Type
Status


Mandatory for


Contexts


Categories


Synonyms

MLS Unit Association Type

Related entries


Broader term


Narrower term


Definition

The azimuth (lateral information) configuration used for the Microwave Landing System (MLS) ground equipment.

Definition Source

  • AIFDD

Note

There is no known note.

Moving Target Detector

Link Semantic Value
Term Moving Target Detector
Status


Mandatory for


Contexts


Categories


Synonyms


Related entries

Moving Target Indicator

Active reflector

Broader term


Narrower term


Abbreviation

MTD

Definition

A technique for achieving fixed and moving clutter rejection by a cascade of digital MTI and Pulse Doppler Filters.

Definition Source

EUROCONTROL EATMP Glossary, June 2001

Note

Moving Target Indicator

Link Semantic Value
Term Moving Target Indicator
Status


Mandatory for


Contexts


Categories


Synonyms


Related entries

Moving Target Detector

Active reflector

Doppler shift

Broader term


Narrower term


Abbreviation

MTI

Definition

A primary radar filtering device designed to reject fixed clutter and pass moving target on the basis of their Doppler shift. Or more generally a pre-whitening filter that reduces the fixed clutter below the white noise level.

Definition Source

EUROCONTROL EATMP Glossary, June 2001

Note

Navigation Aid Point Angular Indication

Link Semantic Value
Term Navigation Aid Point Angular Indication
Status


Mandatory for


Contexts


Categories


Synonyms

Angular Reference

Related entries


Broader term


Narrower term


Definition

A published bearing to or radial from a radio navigation aid, referenced to a significant point or radio navigation aid checkpoint.

Definition Source

  • AIFDD

Note

There is no known note.

Navigation Aid Point Distance Indication

Link Semantic Value
Term Navigation Aid Point Distance Indication
Status


Mandatory for


Contexts


Categories


Synonyms


Related entries


Broader term


Narrower term


Definition

A published distance between a radio navigation aid and a significant point or radio navigation aid checkpoint.

Definition Source

  • AIFDD

Note

There is no known note.

Navigation Service Checkpoint Type

Link Semantic Value
Term Navigation Service Checkpoint Type
Status


Mandatory for


Contexts


Categories


Synonyms


Related entries


Broader term


Narrower term


Definition

The type of navigation system for which the checkpoint has been established.

Definition Source

  • AIFDD

Note

For example: INS, VOR, or GNSS.

Navigation aid

Link Semantic Value
Term navigation aid
Status


Mandatory for


Contexts


Categories


Synonyms

navigational aid

aid to air navigation

Related entries

radio navigation aid

Broader term


Narrower term


Abbreviation

NAVAID

Definition

Any visual or electronic device, airborne or on the surface of the earth, that provides point-to-point guidance information or position data to aircraft in flight.

Definition Source

Transport Canada (2010) Glossary for Pilots and Air Traffic Services Personnel (TP 11958E) [7]

Note

Non-Directional Radio Beacon

Link Semantic Value
Term Non-Directional Radio Beacon
Status


Mandatory for


Contexts

EAEA

Categories


Synonyms


Related entries


Broader term


Narrower term


Abbreviation

NDB

Definition

A low or medium radio navigation service transmitting signals whereby the pilot of a suitably equipped aircraft can determine bearings, 'home in' on, and/or track to or from the station.

Definition Source

Aeronautical Information Feature Data Dictionary (AIFDD)

Note

The radio frequencies assigned to an NDB shall be selected from those available in that portion of the spectrum between 190 and 1750 kilohertz (kHz).

Obstacle Free Zone

Link Semantic Value
Term Obstacle Free Zone
Status


Mandatory for


Contexts


Categories


Synonyms


Related entries


Broader term


Narrower term


Abbreviation

OFZ

Definition

The airspace above the inner approach surface, inner transitional surfaces, and balked landing surface and that portion of the strip bounded by these surfaces, which is not penetrated by any fixed obstacle other than a low-mass and frangibly mounted one required for air navigation purposes.

Definition Source

Aeronautical Information Feature Data Dictionary (AIFDD)

Note

Obstacle Identifier

Link Semantic Value
Term Obstacle Identifier
Status


Mandatory for


Contexts


Categories


Synonyms


Related entries


Broader term


Narrower term


Definition

A published identifier allowing the unique identification of an obstacle within a State.

Definition Source

  • AIFDD

Note

There is no known note.

Obstacle Marking Present

Link Semantic Value
Term Obstacle Marking Present
Status


Mandatory for


Contexts


Categories


Synonyms


Related entries


Broader term


Narrower term


Definition

An indication that an obstacle that constitutes a danger to air navigation is marked by visual means other than a light.

Definition Source

  • AIFDD

Note

May be painted or may display flags.

Precision Approach Radar

Link Semantic Value
Term Precision Approach Radar
Status


Mandatory for


Contexts

EAEA

Categories


Synonyms


Related entries


Broader term


Narrower term


Abbreviation

PAR

Definition

Primary radar equipment used to determine the position of an aircraft during final approach, in terms of lateral and vertical deviations relative to a nominal approach path, and in range relative to touchdown.

Definition Source

Aeronautical Information Feature Data Dictionary (AIFDD)

Ref. ICAO, Official definition, ANNEX 10/I Aeronautical Telecommunications — Radio Navigation Aids

Note

Radar beacon

Link Semantic Value
Term radar beacon
Status


Mandatory for


Contexts


Categories


Synonyms


Related entries


Broader term

beacon

Narrower term


Abbreviation

Definition

"A transponder beacon transmitting a coded signal on radar frequency, permitting an interrogating craft to determine the bearing and range of the transponder."

Definition Source

NATO: NORTH ATLANTIC TREATY ORGANIZATION, Advisory Group for Aerospace Research and Development (AGARD/NATO) (1980), "Agard Multilingual Aeronautical Dictionary", Second Edition, London

Note

Radio Communication Channel Flight Checked

Link Semantic Value
Term Radio Communication Channel Flight Checked
Status


Mandatory for


Contexts


Categories

,

Synonyms


Related entries


Broader term


Narrower term


Definition

An indication that the communication channel has been checked in flight by the appropriate authority.

Definition Source

  • AIFDD

Note

There is no known note.

Radio Communication Channel Selective Calling Available

Link Semantic Value
Term Radio Communication Channel Selective Calling Available
Status


Mandatory for


Contexts


Categories

,

Synonyms

SELCAL Available

Related entries


Broader term


Narrower term


Definition

An indication that selective calling (SELCAL) is available on the particular frequency.

Definition Source

  • AIFDD

Note

Selective calling is a system which permits the selective calling of individual aircraft over radio telephone channels linking a ground station with the aircraft.

Radio Navigation Service Coverage

Link Semantic Value
Term Radio Navigation Service Coverage
Status


Mandatory for


Contexts


Categories


Synonyms


Related entries


Broader term


Narrower term


Definition

The allowable circular sector coverage of a navigational aid signal.

Definition Source

  • AIFDD

Note

There is no known note.

Radio Navigation Service Coverage Type

Link Semantic Value
Term Radio Navigation Service Coverage Type
Status


Mandatory for


Contexts


Categories


Synonyms

NAVAID Coverage Type

Related entries


Broader term


Narrower term


Definition

The allowable circular sector coverage of a navigational aid signal.

Definition Source

  • AIFDD

Note

There is no known note.

Radio Navigation Service Limitation

Link Semantic Value
Term Radio Navigation Service Limitation
Status


Mandatory for


Contexts


Categories


Synonyms


Related entries


Broader term


Narrower term


Definition

A factor which would detract expected performance of a navigational aid signal circular sector.

Definition Source

  • AIFDD

Note

There is no known note.

Radio Navigation Service Limitation Type

Link Semantic Value
Term Radio Navigation Service Limitation Type
Status


Mandatory for


Contexts


Categories


Synonyms

NAVAID Limit Type

Related entries


Broader term


Narrower term


Definition

The type of factor which would detract expected performance of a navigational aid signal circular sector.

Definition Source

  • AIFDD

Note

There is no known note.

Radio beacon

Link Semantic Value
Term radio beacon
Status


Mandatory for


Contexts


Categories


Synonyms


Related entries


Broader term

beacon

Narrower term


Abbreviation

Definition

"A radio transmitter whose radiations enable a craft to determine its own direction or position relative to the beacon by means of a communication receiver or direction finder."

Definition Source

NATO: NORTH ATLANTIC TREATY ORGANIZATION, Advisory Group for Aerospace Research and Development (AGARD/NATO) (1980), "Agard Multilingual Aeronautical Dictionary", Second Edition, London

Note

Radio navigation aid

Link Semantic Value
Term radio navigation aid
Status


Mandatory for


Contexts


Categories


Synonyms


Related entries


Broader term

navigation aid

Narrower term


Abbreviation

Definition

A facility or system external to the aircraft that generates electro-magnetic signals to be used by aircraft navigation systems for position determination or flight path guidance.

Definition Source

ICAO, SASP-MEMO/8 App. F (5)

Note

Satellite Based Augmentation System

Link Semantic Value
Term Satellite Based Augmentation System
Status


Mandatory for


Contexts


Categories


Synonyms


Related entries

ground-based augmentation system (GBAS)

Broader term

Global Navigation Satellite System (GNSS)

Narrower term

Wide Area Augmentation System (WAAS)

Abbreviation

SBAS

Definition

A network of ground stations and satellites designed to receive navigation signals, improving the accuracy and ensuring the integrity of information for navigation and landing.

Definition Source

  • AIFDD

Note

Significant Point

Link Semantic Value
Term Significant Point
Status


Mandatory for


Contexts


Categories


Synonyms


Related entries


Broader term


Narrower term


Definition

A specified geographical location used to define an air traffic service (ATS) route, the flight path of an aircraft or for other navigation/ATS purposes.

Definition Source

Aeronautical Information Feature Data Dictionary (AIFDD)

Note

Significant Point Association to Airspace

Link Semantic Value
Term Significant Point Association to Airspace
Status


Mandatory for


Contexts


Categories

,

Synonyms

Significant Point in Airspace

Related entries


Broader term


Narrower term


Definition

The use and location relative to an airspace of a significant point.

Definition Source

  • AIFDD

Note

A significant point is a specified geographical location used to define an Air Traffic Service (ATS) route, the flight path of an aircraft and/or for other navigation/ATS purposes.

Special Navigation Service Type

Link Semantic Value
Term Special Navigation Service Type
Status


Mandatory for


Contexts


Categories


Synonyms


Related entries


Broader term


Narrower term


Definition

The type of service provided by the station equipment within the special navigation system chain.

Definition Source

  • AIFDD

Note

For example: Master, Red Slave (DECCA), or Slave (LORAN).

Special Navigation System

Link Semantic Value
Term Special Navigation System
Status


Mandatory for


Contexts


Categories


Synonyms


Related entries


Broader term


Narrower term


Definition

A wide area (worldwide) service based on a chain of land stations providing radio frequency signals which can be used by airborne equipment to determine the aircraft's two-dimensional position.

Definition Source

  • AIFDD

Note

For example: DECCA or LORAN.

Special Navigation System Chain Identifier

Link Semantic Value
Term Special Navigation System Chain Identifier
Status


Mandatory for


Contexts


Categories


Synonyms


Related entries


Broader term


Narrower term


Definition

The unique identifier of a special navigation system chain of stations.

Definition Source

  • AIFDD

Note

There is no known note.

Special Navigation System Station

Link Semantic Value
Term Special Navigation System Station
Status


Mandatory for


Contexts


Categories


Synonyms


Related entries


Broader term


Narrower term


Definition

A land based facility emitting a radio signal for a Special Navigation System.

Definition Source

Aeronautical Information Feature Data Dictionary (AIFDD)

Note

Special Navigation System Type

Link Semantic Value
Term Special Navigation System Type
Status


Mandatory for


Contexts


Categories


Synonyms


Related entries


Broader term


Narrower term


Definition

The type of a worldwide land-based special navigation system.

Definition Source

  • AIFDD

Note

For example: DECCA or LORAN.

Station Declination

Link Semantic Value
Term Station Declination
Status


Mandatory for


Contexts


Categories


Synonyms

VOR and TACAN Declination

Related entries


Broader term


Narrower term


Definition

An alignment variation between the zero degree radial of a station and True North, determined at the time the station is calibrated.

Definition Source

  • AIFDD

Note

There is no known note.

Tactical Air Navigation Aid Beacon

Link Semantic Value
Term Tactical Air Navigation Aid Beacon
Status


Mandatory for


Contexts


Categories


Synonyms


Related entries


Broader term


Narrower term


Abbreviation

  • TACAN

Definition

A military Ultra High Frequency (UHF) radio navigation service able to provide continuous bearing and Distance Measuring Equipment (DME) distance to a selected station.

Definition Source

Aeronautical Information Feature Data Dictionary (AIFDD)

Note

A navigation system developed by military and naval forces providing, as far as the navigating pilot is concerned and for suitably equipped aircraft, the same indication as a VOR/DME system. DME Distance is defined as the line of sight distance (slant range) from the source of a DME signal to the receiving antenna.

Tactical Air Navigation Aid Channel

Link Semantic Value
Term Tactical Air Navigation Aid Channel
Status


Mandatory for


Contexts


Categories


Synonyms

TACAN Channel

Related entries


Broader term


Narrower term


Definition

The Tactical Air Navigation Aid (TACAN) frequency as specified in ICAO Annex 10, Chapter 3, Table A.

Definition Source

  • AIFDD

Note

TACAN operating channels shall be chosen from ICAO Annex 10 Chapter 3 Table A, of the 352 channels in which the channel numbers, frequencies, and pulse codes are assigned. They are specified by a number followed by a letter.

Tactical Air Navigation Aid Component

Link Semantic Value
Term Tactical Air Navigation Aid Component
Status


Mandatory for


Contexts


Categories


Synonyms

TACAN Component

Related entries


Broader term


Narrower term


Definition

The component of the Tactical Air Navigation Aid (TACAN).

Definition Source

  • AIFDD

Note

For example: azimuth indicator or distance indicator.

Tactical Air Navigation Aid Component Limitation

Link Semantic Value
Term Tactical Air Navigation Aid Component Limitation
Status


Mandatory for


Contexts


Categories


Synonyms

TACAN Component Limitation

Related entries


Broader term


Narrower term


Definition

The component of the Tactical Air Navigation Aid (TACAN) for which a limitation exists.

Definition Source

Aeronautical Information Feature Data Dictionary (AIFDD)

Note

For example: azimuth indicator or distance indicator.

Underwater locator beacon

Link Semantic Value
Term underwater locator beacon
Status


Mandatory for


Contexts


Categories


Synonyms

underwater acoustic beacon

Related entries


Broader term

beacon

Narrower term


Abbreviation

ULB

Definition

a device fitted to aviation flight recorders such as the cockpit voice recorder and flight data recorder.

Definition Source

SKYBRARY (aviation safety knowledge reference tool) [8]

Note

ULBs are also sometimes required to be attached directly to an aircraft fuselage. When triggered by water immersion, the ULB emits an ultrasonic pulse of 37.5 kHz at an interval of once per second, for a duration of at least 30 days.

The devices are designed not only to survive accidents, but to function correctly after impact.

VHF Omnidirectional Radio Beacon

Link Semantic Value
Term VHF Omnidirectional Radio Beacon
Status


Mandatory for


Contexts


Categories


Synonyms


Related entries


Broader term


Narrower term


Abbreviation

  • VOR

Definition

A Very High Frequency (VHF) radio navigation service which uses phase comparisons of a ground transmitted signal to determine bearing.

Definition Source

  • AIFDD

Note

This term is derived from the expression 'very high frequency omnidirectional radio range'.

VHF Omnidirectional Radio Beacon Type

Link Semantic Value
Term VHF Omnidirectional Radio Beacon Type
Status


Mandatory for


Contexts


Categories


Synonyms

VOR Type

Related entries


Broader term


Narrower term


Definition

The type of VHF Omnidirectional Radio Beacon (VOR) based on its unique equipment.

Definition Source

  • AIFDD

Note

For example: conventional VOR or Doppler VOR.

VORTAC

Link Semantic Value
Term VORTAC
Status


Mandatory for


Contexts


Categories


Synonyms

Combined VOR and TACAN

Related entries

VHF Omnidirectional Radio Beacon (VOR)

Tactical Air Navigation Aid Beacon (TACAN)

Broader term


Narrower term


Abbreviation

VORTAC

Definition

A navigation aid providing VOR azimuth, TACAN azimuth, and TACAN Distance Measuring Equipment (DME) at one site.

Definition Source

FAA (2010) Pilot/Controller Glossary [9]

Note

Visual Approach Slope Indicator System Approach Slope

Link Semantic Value
Term Visual Approach Slope Indicator System Approach Slope
Status


Mandatory for


Contexts


Categories

,

Synonyms

VASIS Approach Slope

Related entries


Broader term


Narrower term


Definition

A descent angle determined for visual vertical guidance during the final approach.

Definition Source

  • AIFDD

Note

There is no known note.

Visual Approach Slope Indicator System Number of Units

Link Semantic Value
Term Visual Approach Slope Indicator System Number of Units
Status


Mandatory for


Contexts


Categories

,

Synonyms

VASIS Number of Units

Related entries


Broader term


Narrower term


Definition

The number of units that compose the visual approach slope indicator system.

Definition Source

  • AIFDD

Note

There is no known note.

Visual Approach Slope Indicator System Type

Link Semantic Value
Term Visual Approach Slope Indicator System Type
Status


Mandatory for


Contexts


Categories

,

Synonyms

VASIS Type

Related entries


Broader term


Narrower term


Definition

The type of visual approach slope guidance system installed based on the number, color, and/or position of various components.

Definition Source

  • AIFDD

Note

There is no known note.

Waypoint

Link Semantic Value
Term waypoint
Status


Mandatory for


Contexts


Categories


Synonyms

spelling variant: way-point

Related entries


Broader term


Narrower term


Abbreviation

WPT

Definition

A specified geographical location used to define an area navigation route or the flight path of an aircraft employing area navigation. Waypoints are identified as either: Fly-by waypoint [...] or Flyover waypoint [...]

Definition Source

ICAO (2006), doc. 8168 (Aircraft Operations), Vol. I (Flight Procedures)

Note