FullDescription:Rules of the Air
Advisory airspace
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| Term | advisory airspace |
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Abbreviation
Definition
An airspace of defined dimensions, or designated route, within which air traffic advisory service is available.
Definition Source
ICAO (2005) Official definition, ANNEX 2 Rules of the Air 2005
Note
Aerodrome Traffic Zone
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| Term | Aerodrome Traffic Zone |
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Abbreviation
ATZ
Definition
An airspace of defined dimensions established around an aerodrome for the protection of aerodrome traffic.
Definition Source
ICAO (2005), Official definition, ANNEX 2 Rules of the Air 2005
Note
Aeronautical station
| Link | Semantic Value |
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| Term | aeronautical station |
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Abbreviation
Definition
A land station in the aeronautical mobile service. In certain instances, an aeronautical station may be located, for example, on board ship or on a platform at sea.
Definition Source
ICAO (2005) Official definition,
ANNEX 2 Rules of the Air 2005,
ANNEX 10/II Aeronautical Telecommunications — Communication Procedures including those with PANS status 2001, 6th ed. (Amdt 78, 14/07/2003)
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Air traffic
| Link | Semantic Value |
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| Term | air traffic |
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Abbreviation
Definition
All aircraft in flight or operating on the manoeuvring area of an aerodrome.
Definition Source
ICAO (2005) Official definition, ANNEX 2 Rules of the Air 2005
Note
Air traffic advisory service
| Link | Semantic Value |
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| Term | air traffic advisory service |
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Abbreviation
Definition
A service provided within advisory airspace to ensure separation, in so far as practical, between aircraft which are operating on IFR flight plans.
Definition Source
ICAO, Official definition, ANNEX 2 Rules of the Air 2005, 10th ed.
Note
Air traffic control clearance
| Link | Semantic Value |
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| Term | Air traffic control clearance |
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ICAO; EU |
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ATC clearance clearance |
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Abbreviation
Definition
Authorization for an aircraft to proceed under conditions specified by an air traffic control unit.
Definition Source
1. ICAO (2007) Official definition, PANS-ATM Procedures for Air Navigation Services — Air Traffic Management [Doc 4444] 2007, 15th ed. (Amdt 4, 15/11/2012)
2. SESAR Concept of Operations Step 2 Edition 2014 (Ed. 01.01.00)
Note
For convenience, the term “air traffic control clearance” is frequently abbreviated to “clearance” when used in appropriate contexts. The abbreviated term “clearance” may be prefixed by the words “taxi”, “take-off”, “departure”, “en-route”, “approach” or “landing” to indicate the particular portion of flight to which the air traffic control clearance relates.
Lexicon Release
Lexicon Release 2015.1
Air traffic control service
| Link | Semantic Value |
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| Term | air traffic control service |
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EUROCONTROL SESAR |
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Abbreviation
Definition
A service provided for the purpose of:
a) preventing collisions:
1. between aircraft, and
2. on the manoeuvring area between aircraft and obstructions; and
b) expediting and maintaining an orderly flow of air traffic.
Definition Source
ICAO, Official definition, AN 2 Rules of the Air 2005
Note
Lexicon Release
Lexicon Release 2015.2
Air traffic control unit
| Link | Semantic Value |
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| Term | air traffic control unit |
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ATC unit |
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Abbreviation
Definition
A generic term meaning variously, area control centre, approach control unit or aerodrome control tower.
Definition Source
ICAO, Official definition, modified by: Amdt 40 to An 11 (01/11/2001), Amdt 36 to An 2 (01/11/2001), and PANS-ATM, 14th ed. (01/11/2001)
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Air traffic services unit
| Link | Semantic Value |
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| Term | air traffic services unit |
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ATS unit |
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Abbreviation
ATSU
Definition
A generic term meaning variously, air traffic control unit, flight information centre or air traffic services reporting office.
Definition Source
ICAO (2007) Official definition
ANNEX 3 Meteorological Service for International Air Navigation 2010
ANNEX 11 Air Traffic Services 2001
Note
Airspace restriction
| Link | Semantic Value |
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| Term | airspace restriction |
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Abbreviation
Definition
a defined volume of airspace within which, variously, activities dangerous to the flight of aircraft may be conducted at specified times (a ‘danger area’); or such airspace situated above the land areas or territorial waters of a State, within which the flight of aircraft is restricted in accordance with certain specified conditions (a ‘ restricted area ’); or airspace situated above the land areas or territorial waters of a State, within which the flight of aircraft is prohibited (a ‘ prohibited area ’).
Definition Source
EUROCONTROL (2010) Draft EUROCONTROL Specification for harmonized Rules for Operational Air Traffic (OAT) under Instrument Flight Rules (IFR) inside controlled Airspace of the ECAC Area (EUROAT), Ed. 1.2
COMMISSION REGULATION (EC) No 2150/2005, of 23 December 2005 laying down common rules for the flexible use of airspace
Note
In the context of SESAR, this term is often referred to as "airspace reservation/restriction" (ARES).
Airspace structure
| Link | Semantic Value |
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| Term | airspace structure |
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Abbreviation
Definition
"A specific volume of airspace designed to ensure the safe and optimal operation of aircraft."
Definition Source
EUROPEAN UNION (2005) Commission Regulation (EC) No 2150/2005 of 23 December 2005 laying down common rules for the flexible use of airspace
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Airspace structure data
| Link | Semantic Value |
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| Term | airspace structure data |
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Abbreviation
Definition
"Set of data defining the airspace structure on which the functions comprising an automated ATS system are based."
Definition Source
EUROCONTROL (2004) EATM glossary
Note
Airway
| Link | Semantic Value |
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| Term | airway |
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Abbreviation
AWY
Definition
"A control area or portion thereof in the form of a corridor."
Definition Source
ICAO (2007) "International Civil Aviation Vocabulary", Doc. 9713
Note
Alerting service
| Link | Semantic Value |
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| Term | alerting service |
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Abbreviation
ALRS
Definition
A service provided to notify appropriate organizations regarding aircraft in need of search and rescue aid, and assist such organizations as required.
Definition Source
ICAO, Official definition, AN 2 Rules of the Air 2005
Note
Along-track error
| Link | Semantic Value |
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| Term | along-track error |
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Abbreviation
ATRK
Definition
A fix error along the flight track resulting from the total error contributions.
Definition Source
ICAO - GNSSP/2-WP/87 (Version 4.0) - p.1A-42
Note
Along-track tolerance
| Link | Semantic Value |
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| Term | along-track tolerance |
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Abbreviation
ATT
Definition
A fix tolerance along the nominal track resulting from the airborne and ground equipment tolerances.
Definition Source
ICAO, Official definition,
PANS-OPS/II Procedures for Air Navigation Services — Aircraft Operations — Construction of Visual and Instrument Flight Procedures [Doc 8168/II] 2006
Note
Alternate aerodrome
| Link | Semantic Value |
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| Term | alternate aerodrome |
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Abbreviation
ALTN
Definition
An aerodrome to which an aircraft may proceed when it becomes either impossible or inadvisable to proceed to or to land at the aerodrome of intended landing. Alternate aerodromes include the following:
a) Take-off alternate : an alternate aerodrome at which an aircraft can land should this become necessary shortly after take-off and it is not possible to use the aerodrome of departure;
b) En-route alternate : an aerodrome at which an aircraft would be able to land after experiencing an abnormal or emergency condition while en route;
c) ETOPS en-route alternate: a suitable and appropriate alternate aerodrome at which an aeroplane would be able to land after experiencing an engine shut-down or other abnormal emergency condition while en route in an ETOPS operation.
d) Destination alternate : an alternate aerodrome to which an aircraft may proceed should it become impossible or inadvisable to land at the aerodrome of intended landing.
Definition Source
ICAO (2007) Annex 2, Annex 3, Annex 6/I, Annex 11; Doc. 9713
Note
"The aerodrome from which a flight departs may also be an en-route or a destination alternate aerodrome for that flight." (source: ICAO doc. 9713)
Alternative trajectory
| Link | Semantic Value |
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| Term | alternative trajectory |
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Abbreviation
Definition
A trajectory which is calculated based on constraints which do not currently apply to the flight.
Definition Source
EUROCONTROL, EATM glossary 2004
Note
Approach control office
| Link | Semantic Value |
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| 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 |
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| Term | approach control unit |
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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 sequence
| Link | Semantic Value |
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| Term | approach sequence |
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ICAO NATO |
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Abbreviation
Definition
The order in which two or more aircraft are cleared to approach to land at the aerodrome.
Definition Source
ICAO (2004) Official definition, doc. PANS-ATM Procedures for Air Navigation Services — Air Traffic Management [Doc 4444] 2001, 14th ed. (Amdt 3, 29/06/2004)
Note
Appropriate ATS authority
| Link | Semantic Value |
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| Term | appropriate ATS authority |
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appropriate Air Traffic Services authority |
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Abbreviation
Definition
The relevant authority designated by the State responsible for providing air traffic services in the airspace concerned.
Definition Source
ICAO (2010) Official definition
AN 2 Rules of the Air 2005
AN 3 Meteorological Service for International Air Navigation 2010
AN 11 Air Traffic Services 2001
Note
Apron taxiway
| Link | Semantic Value |
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| Term | apron taxiway |
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Abbreviation
Definition
A portion of a taxiway system located on an apron and intended to provide a through taxi route across the apron.
Definition Source
ICAO, Official definition
AN 2 Rules of the Air 2005
AN 4 Aeronautical Charts 2001, 10th ed. (Amdt 53, 12/07/2004)
AN 14/I Aerodromes — Aerodrome Design and Operations 2004, 4th ed. (Amdt 6, 12/07/2004)
Note
Area control centre
| Link | Semantic Value |
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| Term | area control centre |
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Abbreviation
ACC
Definition
A unit established to provide air traffic control service to controlled flights in control areas under its jurisdiction.
Definition Source
ICAO (2010) Official definition, AN 2 Rules of the Air 2005, AN 3 Meteorological Service for International Air Navigation 2010, AN 11 Air Traffic Services 2001
Note
| Link | Semantic Value |
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| Term | area navigation |
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Precision Area Navigation (P-RNAV) |
Abbreviation
RNAV
Definition
A method of navigation which permits aircraft operations on any desired flight path within the coverage of ground- or spaced-based navigation aids or within the limits of the capability of self-contained aids, or a combination of these.
Definition Source
ICAO, Official term and definition added to AN 2 by Amdt 41 (20/07/2008), AN 3 by Amdt 75 (2010), AN 4 by Amdt 55 (2009), AN 6/I by Amdt 32 (20/07/2008), AN 6/III by Amdt 13 (20/07/2008), AN 10/I by Amdt 83 (20/07/2008), AN 15 by Amdt 35 (2009) and modified by Amdt 46 to AN 11 (20/07/2008)
Note
Area navigation includes performance-based navigation as well as other operations that do not meet the definition of performance-based navigation. (Note source: ICAO)
| Link | Semantic Value |
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| Term | basic area navigation |
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area navigation (RNAV) |
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Abbreviation
B-RNAV
Definition
European RNAV operations which satisfy a required track, maintaining accuracy of ± 5 NM for at least 95% of the flight time. This level of navigation accuracy is comparable with that which can be achieved by conventional navigation techniques on ATC routes (defined by VOR/DME, when VORs are less than 100 NM apart).
Definition Source
EUROCONTROL, Skyway magazine No.46 - Autumn/Winter 2007
Note
Change-over point
| Link | Semantic Value |
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| Term | change-over point |
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Abbreviation
COP
Definition
The point at which an aircraft navigating on an ATS route segment defined by reference to very high frequency omnidirectional radio ranges is expected to transfer its primary navigational reference from the facility behind the aircraft to the next facility ahead of the aircraft.
Definition Source
ICAO, Official definition, ANNEX 11, Rules of the Air
Note
Change-over points are established to provide the optimum balance in respect of signal strength and quality between facilities at all levels to be used and to ensure a common source of azimuth guidance for all aircraft operating along the same portion of a route segment.
Clearance function
| Link | Semantic Value |
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| Term | clearance function |
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Abbreviation
Definition
The formulation and transmission of a clearance by an air traffic control unit as well as the acknowledgement and acceptance of such clearance by the pilot.
Definition Source
ICAO, Doc 9426, 1984, p. V-1-1-4
Note
Clearance limit
| Link | Semantic Value |
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| Term | clearance limit |
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Abbreviation
Definition
The point to which an aircraft is granted an air traffic control clearance.
Definition Source
ICAO, Official definition
ANNEX 11 Air Traffic Services 2001
PANS-ATM Procedures for Air Navigation Services — Air Traffic Management [Doc 4444] 2001, 14th ed. (Amdt 3, 29/06/2004)
ANNEX 2 Rules of the Air 2005
Note
Co-operative Separation Assurance
| Link | Semantic Value |
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| Term | Co-operative Separation Assurance |
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Abbreviation
COSEP
Definition
advanced surveillance enabler - consisting of exchanges of state and intent data from aircraft to aircraft - to delegate separation assurance applications, such as in-trail or station keeping manoeuvres, crossing manoeuvres, airborne conflict avoidance, to aircrew under given conditions
Definition Source
ICAO (2002), "AERONAUTICAL MOBILE COMMUNICATIONS PANEL (AMCP), Working Group C - 5th meeting, 15 - 25 October 2002: AMCP/8 REPORT, chapters 8 and 9", Document AMCP WGC5/WP2. URL: http://www.icao.int/anb/panels/amcp/wg/C/wgc5/wgc5/wgc5_wp2.doc
Note
Controlled Airspace
| Link | Semantic Value |
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| Term | Controlled Airspace |
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Abbreviation
CAS
Definition
airspace type of defined dimensions within which air traffic control service is provided to IFR flights and to VFR flights in accordance with the airspace classification.
Definition Source
ICAO (2007), Official definition (Annex 2 and 11, PANS-ATM), "International Civil Aviation Vocabulary", Doc. 9713
Note
The controlled airspace includes control areas, airways and control zones and, depending on type of flight and air traffic service provided is classified as class A,B,C,D, and E.
Controlled VFR flight
| Link | Semantic Value |
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| Term | controlled VFR flight |
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CVFR flight |
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Abbreviation
Definition
A flight conducted under VFR within Class B airspace and in accordance with an ATC clearance.
Definition Source
Transport Canada, Glossary for Pilots and Air Traffic Services Personnel, URL: http://www.tc.gc.ca/eng/civilaviation/secretariat-terminology-glossary-36.htm
Note
Controlled aerodrome
| Link | Semantic Value |
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| Term | controlled aerodrome |
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Abbreviation
Definition
An aerodrome at which an air traffic control service is provided to aerodrome traffic.
Definition Source
ICAO/OACI, "International Civil Aviation Vocabulary", Doc. 9713, Vol.1, 1998, C325
Note
Controlled flight
| Link | Semantic Value |
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| Term | controlled flight |
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Abbreviation
Definition
"Any flight which is subject to an air traffic control clearance."
Definition Source
ICAO (2007) "International Civil Aviation Vocabulary", Doc. 9713
Note
Cruising level
| Link | Semantic Value |
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| Term | cruising level |
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Abbreviation
Definition
A level maintained during a significant portion of a flight.
Definition Source
ICAO, Official definition, Annex 6/I, Operation of Aircraft — International Commercial Air Transport — Aeroplanes (2010)
Note
Current flight plan
| Link | Semantic Value |
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| Term | current flight plan |
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Abbreviation
Definition
The flight plan, including changes, if any, brought about by subsequent clearances.
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
When the word 'message' is used as a suffix to this term, it denotes the content and format of the current flight plan data sent from one unit to another.
Danger area
| Link | Semantic Value |
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| Term | danger area |
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Abbreviation
Definition
An airspace of defined dimensions within which activities dangerous to the flight of aircraft may exist at specified times.
Definition Source
ICAO, Official definition,
ANNEX 2 Rules of the Air 2005
ANNEX 4 Aeronautical Charts 2001, 10th ed. (Amdt 53, 12/07/2004)
ANNEX 15 Aeronautical Information Services 2010
Note
Departure flight level
| Link | Semantic Value |
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| Term | departure flight level |
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Abbreviation
Definition
The flight level to which the flight is initially to climb issued as part of a departure clearance.
Definition Source
EUROCONTROL Standard Document For On-Line Data Interchange (OLDI), Edition Number : 3.00, Edition Date : 31/10/2003
Note
Diplomatic clearance
| Link | Semantic Value |
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| Term | diplomatic clearance |
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diplomatic authorisation |
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Abbreviation
Definition
Authority for overflight or landing obtained at government level.
Definition Source
JANE's Aerospace Dictionary, Third Edition, 1988
Note
Estimated Off-Block Time
| Link | Semantic Value |
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| Term | Estimated Off-Block Time |
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Scheduled Off-Block Time (SOBT) Target Off-Block Time (TOBT) |
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Abbreviation
EOBT
Definition
The estimated time at which the aircraft will commence movement associated with departure.
Definition Source
1.SESAR Concept of Operations Step 2 Edition 2014 (Ed. 01.01.00)
2.ICAO (2007) Official definition, PANS-ATM Procedures for Air Navigation Services — Air Traffic Management [Doc 4444] 2007, 15th ed. (Amdt 4, 15/11/2012)
3. EUROCONTROL/IATA/ACI, Airport CDM Implementation Manual, V.4, March 2012
Note
Lexicon Release
Lexicon Release 2016.1
Estimated time of departure
| Link | Semantic Value |
|---|---|
| Term | estimated time of departure |
| Status |
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| Mandatory for |
|
| Contexts |
|
| Categories |
|
| Synonyms |
estimated departure time |
| Related entries |
|
| Broader term |
|
| Narrower term |
|
Abbreviation
ETD
Definition
The estimated time at which an aircraft will become airborne.
Definition Source
Transport Canada, Glossary for Pilots and Air Traffic Services Personnel (TP 11958E)[1]
Note
Exit flight level
| Link | Semantic Value |
|---|---|
| Term | exit flight level |
| Status |
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| Mandatory for |
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| Contexts |
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| Broader term |
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| Narrower term |
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Abbreviation
Definition
The flight level at which an aircraft will leave the FIR or the control area.
Definition Source
EUROCONTROL (2001) EATMP Glossary
Note
Expected approach time
| Link | Semantic Value |
|---|---|
| Term | expected approach time |
| Status |
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| Mandatory for |
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| Contexts |
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| Broader term |
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| Narrower term |
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Abbreviation
EAT
Definition
The time at which ATC expects that an arriving aircraft, following a delay, will leave the holding fix to complete its approach for a landing.
Definition Source
ICAO, Official definition, ANNEX 2 Rules of the Air, 2005
Note
The actual time of leaving the holding fix will depend upon the approach clearance. (same source)
Filed flight plan
| Link | Semantic Value |
|---|---|
| Term | filed flight plan |
| Status |
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| Mandatory for |
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| Contexts |
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| Synonyms |
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| Broader term |
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| Narrower term |
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Abbreviation
FPL
Definition
The flight plan as filed with an ATS unit by the pilot or a designated representative, without any subsequent changes.
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
When the word 'message' is used as a suffix to this term, it denotes the content and format of the filed flight plan data as transmitted.
Final approach
| Link | Semantic Value |
|---|---|
| Term | final approach |
| Status |
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| Mandatory for |
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| Contexts | |
| Categories |
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| Synonyms |
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| Broader term |
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| Narrower term |
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Abbreviation
Definition
1. ATM phase used in ConOps scenario, from the FAF or FAP to the beginning of the landing flare.
2. That part of an instrument approach procedure which commences at the specified final approach fix or point, or where such a fix or point is not specified,
a) at the end of the last procedure turn, base turn or inbound turn of a racetrack procedure, if specified; or
b) at the point of interception of the last track specified in the approach procedure; and ends at a point in the vicinity of an aerodrome from which:
1) a landing can be made; or
2) a missed approach procedure is initiated.
Definition Source
1.SESAR Concept of Operations Step 2 Edition 2014 (Ed. 01.01.00)
2.ICAO, Official definition, Procedures for Air Navigation Services — Air Traffic Management [Doc 4444] 2001, 14th ed. (Amdt 3, 29/06/2004)
Note
Lexicon Release
Lexicon Release 2015.1
Flight Information Region
| Link | Semantic Value |
|---|---|
| Term | Flight Information Region |
| Status |
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| Mandatory for |
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| Contexts |
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| Categories |
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| Synonyms |
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| Related entries |
|
| Broader term |
|
| Narrower term |
Abbreviation
FIR
Definition
An airspace of defined dimensions within which flight information service and alerting service are provided.
Definition Source
ICAO, official definition, AN 2 Rules of the Air 2005
Note
(EUROCONTROL, SASS-C Glossary definition) A three-dimensional area in which aircraft are under control of usually a single authority. Internally a FIR is divided into several geographical areas called sectors. Sometimes one or more FIRs have a combined upper area control.
Flight envelope
| Link | Semantic Value |
|---|---|
| Term | flight envelope |
| Status |
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| Mandatory for |
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| Contexts |
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| Categories |
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| Synonyms |
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| Broader term |
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| Narrower term |
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Abbreviation
Definition
the range of airspeeds, altitudes and normal load factors at which the aircraft can (safely) operate.
Definition Source
NATO (2005) doc. ref. RTO-AG-300-V14 12, Ch. 12 (flight envelope)
Note
For military aircraft some specific flight envelopes are defined: (...) Operational Flight Envelope, Service Flight Envelope, Permissible Flight Envelope. (same source)
Flight information centre
| Link | Semantic Value |
|---|---|
| Term | flight information centre |
| Status |
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| Mandatory for |
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| Contexts |
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| Categories |
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| Synonyms |
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| Broader term |
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| Narrower term |
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Abbreviation
FIC
Definition
A unit established to provide flight information service and alerting service.
Definition Source
ICAO, Official definition, AN 2 Rules of the Air, 2005
Note
As indicated by its title, the function of an FIC is to provide “information” useful for the safe and efficient conduct of flights; this is different from the function of units that carry out “control” service (e.g. ACCs), which provide a service aimed at the prevention of collisions as well as the maintenance of an orderly flow of air traffic. [Ref. ICAO Doc 9377, 2008, 4th ed., p. 2-1]
Flight level
| Link | Semantic Value |
|---|---|
| Term | flight level |
| Status |
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| Mandatory for |
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| Contexts | |
| Categories |
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| Synonyms |
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| Broader term |
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| Narrower term |
|
Abbreviation
FL
Definition
A surface of constant atmospheric pressure which is related to a specific pressure datum, 1 013.2 hectopascals (hPa), and is separated from other such surfaces by specific pressure intervals.
Definition Source
ICAO, Official term and definition, AN 2 Rules of the Air (2005)
Note
Note 1.– A pressure type altimeter calibrated in accordance with the Standard Atmosphere:
a. when set to a QNH altimeter setting, will indicate altitude;
b. when set QFE altimeter setting, will indicate height above the QFE reference datum;
c. when set to a pressure of 1 013.2 hPa, may be used to indicate flight levels.
Note 2.– The terms "height" and "altitude", used in Note 1 above, indicate altimetric rather than geometric heights and altitude.
Lexicon Release
Lexicon Release 2015.2
General Air Traffic
| Link | Semantic Value |
|---|---|
| Term | General Air Traffic |
| Status |
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| Mandatory for |
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| Contexts |
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| Categories |
|
| Synonyms |
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| Related entries |
Operational Air Traffic (OAT) |
| Broader term |
|
| Narrower term |
|
Abbreviation
GAT
Definition
all movements of civil aircraft, as well as all movements of State aircraft (including military, customs and police aircraft) when these movements are carried out in conformity with the procedures of the ICAO.
Definition Source
EUROCONTROL (2010) EUROCONTROL Specification for harmonized Rules for Operational Air Traffic (OAT) under Instrument Flight Rules (IFR) inside controlled Airspace of the ECAC Area (EUROAT), Ed. 1.3
Note
For ATFCM purposes only.
Height
| Link | Semantic Value |
|---|---|
| Term | height |
| Status |
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| Mandatory for |
|
| Contexts |
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| Synonyms |
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| Broader term |
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| Narrower term |
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Abbreviation
Definition
The vertical distance of a level, a point, or an object considered as a point, measured from a specified datum.
Definition Source
ICAO, Official definition added to: An 10/I by Amdt 71 (07/11/1996), An 15 by Amdt 33 (25/11/2004) and modified by Amdt 71 to An 10/I (07/11/1996). The note to the official definition appears only in Annex 6/I.
Note
For the purposes of this example, the point referred to above is the lowest part of the aeroplane and the specified datum is the take-off or landing surface, whichever is applicable.
Inadequate separation
{{semantic_table
|term=inadequate separation |status= |mandatory= |synonyms= |categories=
Instrument Flight Rules
| Link | Semantic Value |
|---|---|
| Term | Instrument Flight Rules |
| Status |
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| Mandatory for |
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| Contexts |
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| Synonyms |
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| Broader term |
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| Narrower term |
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Abbreviation
IFR
Definition
A set of rules governing the conduct of flight under instrument meteorological conditions.
Definition Source
ICAO/OACI, "International Civil Aviation Vocabulary", Doc. 9713, Vol.1, 1998
Note
Intermediate Supplementary Flight Level
| Link | Semantic Value |
|---|---|
| Term | Intermediate Supplementary Flight Level |
| Status |
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| Mandatory for |
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| Contexts |
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| Categories |
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| Synonyms |
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| Broader term | |
| Narrower term |
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Abbreviation
ISL
Definition
If an aircraft cannot reach its IFL on entry of the intermediate sector, its ISL will be set by the Auto so that the aircraft's altitude is guaranteed to be between its ISL and IFL when flying through the intermediate sector.
Definition Source
EUROCONTROL SASS-C Glossary
Note
Intermediate flight level
| Link | Semantic Value |
|---|---|
| Term | intermediate flight level |
| Status |
|
| Mandatory for |
|
| Contexts |
|
| Categories |
|
| Synonyms |
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|
| Broader term | |
| Narrower term |
|
Abbreviation
Definition
The target flight level for the intermediate (second) sector. Aircraft crossing less than three sectors have no intermediate Flight Level.
Definition Source
EUROCONTROL SASS-C Glossary
Note
Lateral separation
| Link | Semantic Value |
|---|---|
| Term | lateral separation |
| Status |
|
| Mandatory for |
|
| Contexts |
|
| Categories |
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| Synonyms |
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| Related entries | |
| Broader term | |
| Narrower term |
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Abbreviation
Definition
Separation between aircraft expressed in terms of distance or angular displacement between tracks
Definition Source
ICAO DOC 9426 Air Traffic Services Planning Manual 1984, p. V-1-1-8
Note
Level
| Link | Semantic Value |
|---|---|
| Term | level |
| Status |
|
| Mandatory for |
|
| Contexts | |
| Categories |
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| Synonyms |
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| Broader term |
|
| Narrower term |
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Abbreviation
LVL
Definition
A generic term relating to the vertical position of an aircraft in flight and meaning variously, height, altitude or flight level.
Definition Source
ICAO, Official definition Annex 3, Meteorological Service for International Air Navigation, Eighteenth Edition , July 2013
Note
Lexicon Release
Lexicon Release 2015.2
Longitudinal separation
| Link | Semantic Value |
|---|---|
| Term | ' |
| Status |
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| Mandatory for |
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| Contexts |
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| Synonyms |
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| Broader term | |
| Narrower term |
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Abbreviation
Definition
Separation between aircraft expressed in units of time or distance along track.
Definition Source
ICAO DOC 9426 Air Traffic Services Planning Manual 1984, p. V-1-1-8
Note
Lower airspace
| Link | Semantic Value |
|---|---|
| Term | lower airspace |
| Status |
|
| Mandatory for |
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| Contexts |
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| Categories |
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| Synonyms |
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| Broader term | |
| Narrower term |
|
Abbreviation
Definition
1. Part of airspace below a variable vertical limit.
2. controlled airspace below the division level and outside the terminal or airport airspace. It includes airways linking the airport with upper airspace.
Definition Source
1. EUROCONTROL (2005) Glossary for Flight Statistics & Forecasts, v.1.0
2.EUROCONTROL/EUROPEAN UNION (2009) EPISODE 3 - Single European Sky Implementation support through Validation, D2.4.3-04 - Method for Systematic Risk Assessment for Units of Operation, V. 1.01
Note
Missed approach procedure
| Link | Semantic Value |
|---|---|
| Term | missed approach procedure |
| Status |
|
| Mandatory for |
|
| Contexts |
|
| Categories |
|
| Synonyms |
|
| Related entries | |
| Broader term |
|
| Narrower term |
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Abbreviation
Definition
The procedure to be followed if the approach cannot be continued.
Definition Source
ICAO, "International Civil Aviation Vocabulary", Doc. 9713, Vol.1, 1998
Note
| Link | Semantic Value |
|---|---|
| Term | mixed navigation environment |
| Status |
|
| Mandatory for |
|
| Contexts |
|
| Categories |
|
| Synonyms |
|
| Related entries |
area navigation (RNAV) |
| Broader term |
|
| Narrower term |
|
Abbreviation
Definition
An environment where different navigation specifications may be applied within the same airspace (e.g. RNP 10 routes and RNP 4 routes in the same airspace) or where operations using conventional navigation are allowed in the same airspace with RNAV or RNP applications.
Definition Source
ICAO (2010), doc. 9931 (CDO Manual)
Note
Non-radar separation
{{semantic_table
|term=non-radar separation |status= |mandatory= |synonyms= |categories=
Operational Air Traffic
| Link | Semantic Value |
|---|---|
| Term | Operational Air Traffic |
| Status |
|
| Mandatory for |
|
| Contexts |
|
| Categories |
|
| Synonyms |
|
| Related entries |
General Air Traffic (GAT) |
| Broader term |
|
| Narrower term |
|
Abbreviation
OAT
Definition
all flights, which do not comply with the provisions stated for GAT and for which rules and procedures have been specified by appropriate national authorities.
Definition Source
EUROCONTROL (2010) EUROCONTROL Specification for harmonized Rules for Operational Air Traffic (OAT) under Instrument Flight Rules (IFR) inside controlled Airspace of the ECAC Area (EUROAT), Ed. 1.3
Note
Operational flight plan
| Link | Semantic Value |
|---|---|
| Term | operational flight plan |
| Status |
|
| Mandatory for |
|
| Contexts |
|
| Categories |
|
| Synonyms |
|
| Related entries | |
| Broader term |
|
| Narrower term |
|
Abbreviation
Definition
The operator's plan for the safe conduct of the flight based on considerations of helicopter performance, other operating limitations and relevant expected conditions on the route to be followed and at the heliports concerned.
Definition Source
ICAO, Official definition, AN 6/III Operation of Aircraft — International Operations — Helicopters 2001, 5th ed., amdt. 9, chap. 1
Note
Pair-wise separation
| Link | Semantic Value |
|---|---|
| Term | pair-wise separation |
| Status |
|
| Mandatory for |
|
| Contexts | |
| Categories |
|
| Synonyms |
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| Related entries |
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| Broader term |
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| Narrower term |
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Abbreviation
PWS
Definition
1. Procedure designed for use between arrivals on final approach or between departures from the runway, based on an optimum adjusting of the needed separation between two aircraft taking into account their respective characteristics and giving Controllers more dynamic separation options.
2. A wake vortex separation based on individual aircraft type.
Definition Source
1. SESAR Concept of Operations Step 1 Edition 2013 (Ed. 01.02.00)
2. SESAR (2011) working package 6, Airport Definitions Team
Note
Lexicon Release
Lexicon Release 2015.1
Pressure-altitude
| Link | Semantic Value |
|---|---|
| Term | pressure-altitude |
| Status |
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| Mandatory for |
|
| Contexts |
|
| Categories |
|
| Synonyms |
|
| Related entries |
|
| Broader term |
|
| Narrower term |
|
Abbreviation
Definition
An atmospheric pressure expressed in terms of altitude which corresponds to that pressure in the standard atmosphere.
Definition Source
ICAO (2006) Official definition, Annex 10, Vol. I, Aeronautical Communications - Radio navigation aids
Note
Prohibited area
| Link | Semantic Value |
|---|---|
| Term | prohibited area |
| Status |
|
| Mandatory for |
|
| Contexts |
|
| Categories |
|
| Synonyms |
|
| Related entries | |
| Broader term | |
| Narrower term |
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Abbreviation
Definition
An airspace of defined dimensions, above the land areas or territorial waters of a State, within which the flight of aircraft is prohibited.
Definition Source
ICAO, Official definition,
ANNEX 2 Rules of the Air 2005
ANNEX 4 Aeronautical Charts 2001
ANNEX 15 Aeronautical Information Services 2010
Note
Reduced Vertical Separation Minimum
| Link | Semantic Value |
|---|---|
| Term | Reduced Vertical Separation Minimum |
| Status |
|
| Mandatory for |
|
| Contexts |
|
| Categories |
|
| Synonyms |
|
| Related entries |
|
| Broader term |
|
| Narrower term |
|
Abbreviation
RVSM
Definition
A reduction to 1000 feet vertical separation between flights, which is used in Europe and on the North Atlantic, between FL290 and FL410.
Definition Source
EUROCONTROL, CFMU Glossary, Sept. 2011
Note
Repetitive flight plan
| Link | Semantic Value |
|---|---|
| Term | repetitive flight plan |
| Status |
|
| Mandatory for |
|
| Contexts | |
| Categories |
|
| Synonyms |
|
| Related entries | |
| Broader term |
|
| Narrower term |
|
Abbreviation
RPL
Definition
1. A flight plan related to a series of frequently recurring, regularly operated individual flights with identical basic features, submitted by an operator for retention and repetitive use by ATS units.
2. An integral part of the Network Operations flight plan processing system serving all Air Traffic Services (ATS) Units within the Flight Plan Message (FPM) Distribution Area. The system receives, processes and stores bulk Repetitive Flight Plan details submitted by the Aircraft Operators.
Definition Source
1. ICAO, Official definition, PANS-ATM Procedures for Air Navigation Services — Air Traffic Management [Doc 4444] 2001, 14th ed., Chap. 1
2. EUROCONTROL, NM Glossary (2014)
Note
Restricted area
| Link | Semantic Value |
|---|---|
| Term | restricted area |
| Status |
|
| Mandatory for |
|
| Contexts |
|
| Categories |
|
| Synonyms |
|
| Related entries | |
| Broader term | |
| Narrower term |
|
Abbreviation
Definition
An airspace of defined dimensions, above the land areas or territorial waters of a State, within which the flight of aircraft is restricted in accordance with certain specified conditions.
Definition Source
ICAO, Official definition,
ANNEX 2 Rules of the Air 2005
ANNEX 4 Aeronautical Charts 2001
ANNEX 15 Aeronautical Information Services 2010
Note
Separation
| Link | Semantic Value |
|---|---|
| Term | separation |
| Status |
|
| Mandatory for |
|
| Contexts |
|
| Categories |
|
| Synonyms |
|
| Related entries |
|
| Broader term |
|
| Narrower term |
Abbreviation
Definition
Spacing between aircraft, levels or tracks.
Definition Source
ICAO, doc. 9426, 1984, p. V-1-1-11
Note
Separation constraint
| Link | Semantic Value |
|---|---|
| Term | separation constraint |
| Status |
|
| Mandatory for |
|
| Contexts | |
| Categories |
|
| Synonyms |
|
| Related entries |
|
| Broader term | |
| Narrower term |
|
Abbreviation
Definition
The separation to keep aircraft operating safely on final approach.
Examples are minimum radar separation to keep risk of collision to an acceptable safe level and wake turbulence radar separation to keep the risk of an adverse wake turbulence encounter to an acceptable safe level.
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), Ed 00.01.02 , 2013
Note
Lexicon Release
Lexicon Release 2015.2
Separation minima
| Link | Semantic Value |
|---|---|
| Term | separation minima |
| Status |
|
| Mandatory for |
|
| Contexts |
|
| Categories |
|
| Synonyms |
|
| Related entries | |
| Broader term |
|
| Narrower term |
|
Abbreviation
Definition
The minimum displacements between an aircraft and a hazard which maintain the risk of collision at an acceptable level of safety.
Definition Source
ICAO (2008), doc. 9882, Manual on Air Traffic Management System Requirements
Note
Separation minima infringement
| Link | Semantic Value |
|---|---|
| Term | separation minima infringement |
| Status |
|
| Mandatory for |
|
| Contexts |
|
| Categories |
|
| Synonyms |
|
| Related entries | |
| Broader term |
|
| Narrower term |
|
Abbreviation
SMI
Definition
A situation in which prescribed separation minima were not maintained between aircraft.
Definition Source
EUROCONTROL (2000) ESARR 2 - Edition 1.1 - 30.03.2000, Attachment C to Annex 1 ("Glossary of terms and definitions")
Note
Separation mode
| Link | Semantic Value |
|---|---|
| Term | separation mode |
| Status |
|
| Mandatory for |
|
| Contexts |
|
| Categories |
|
| Synonyms |
|
| Related entries |
|
| Broader term |
|
| Narrower term |
|
Abbreviation
Definition
An approved set of rules, procedures and conditions of application associated with separation minima.
Definition Source
ICAO (2008), doc. 9882, Manual on Air Traffic Management System Requirements
Note
Separation provision
| Link | Semantic Value |
|---|---|
| Term | separation provision |
| Status |
|
| Mandatory for |
|
| Contexts |
|
| Categories |
|
| Synonyms |
|
| Related entries |
|
| Broader term |
|
| Narrower term |
|
Abbreviation
Definition
The tactical process of keeping aircraft away from hazards by at least the appropriate separation minima.
Definition Source
ICAO (2008), doc. 9882, Manual on Air Traffic Management System Requirements
Note
Spacing
| Link | Semantic Value |
|---|---|
| Term | spacing |
| Status |
|
| Mandatory for |
|
| Contexts |
|
| Categories | |
| Synonyms |
|
| Related entries |
|
| Broader term |
|
| Narrower term |
|
Abbreviation
Definition
Any application of a distance or time between an aircraft and a hazard at or above separation minima in order to maintain an orderly flow of traffic.
Definition Source
ICAO (2008), doc. 9882, Manual on Air Traffic Management System Requirements
Note
Strategic Lateral Offset Procedure
| Link | Semantic Value |
|---|---|
| Term | Strategic Lateral Offset Procedure |
| Status |
|
| Mandatory for |
|
| Contexts |
|
| Categories |
|
| Synonyms |
|
| Related entries |
|
| Broader term |
|
| Narrower term |
|
Abbreviation
SLOP
Definition
"an initiative ... developed to increase the lateral separation between aircraft with very accurate navigation systems on adjacent levels in case of altitude deviation errors. SLOP allows pilots to fly either the centreline, 1NM or 2NM to the right of centreline. SLOP may be applied from the Oceanic entry point, returning to centreline at the Oceanic exit point, by any aircraft with automatic offset programming capability".
Definition Source
NATS (2010) article by Karen Bolton, [2]
Note
Supplementary crossing level
| Link | Semantic Value |
|---|---|
| Term | ' |
| Status |
|
| Mandatory for |
|
| Contexts |
|
| Categories |
|
| Synonyms |
|
| Related entries |
|
| Broader term |
|
| Narrower term |
|
Abbreviation
Definition
A level, at or above which, or at or below which a flight has been co-ordinated to cross the transfer of control point. The supplementary level, if present, is an element of the exit level.
Definition Source
EUROCONTROL Standard Document For On-Line Data Interchange (OLDI), Edition Number : 4.00, Edition Date : 12/06/2007
Note
System flight plan
| Link | Semantic Value |
|---|---|
| Term | system flight plan |
| Status |
|
| Mandatory for |
|
| Contexts |
|
| Categories |
|
| Synonyms |
|
| Related entries | |
| Broader term |
|
| Narrower term |
|
Abbreviation
Definition
Information derived from the flight plan of a specific flight held within an FDPS.
Definition Source
EUROCONTROL (2003) Standard for On-line Data Interchange, DPS-ET1-ST06-STD-01-00
Note
Total Estimated Elapsed Time
| Link | Semantic Value |
|---|---|
| Term | Total Estimated Elapsed Time |
| Status |
|
| Mandatory for |
|
| Contexts |
|
| Categories |
|
| Synonyms |
|
| Related entries |
|
| Broader term |
|
| Narrower term |
|
Abbreviation
TTL EET, TTEET, EET
Definition
For IFR flights, the estimated time required from take-off to arrive over that designated point, defined by reference to navigation aids, from which it is intended that an instrument approach procedure will be commenced, or, if no navigation aid is associated with the destination aerodrome, to arrive over the destination aerodrome. For VFR flights, the estimated time required from take-off to arrive over the destination aerodrome.
Definition Source
ICAO (2005), Annex 2, Rules of the Air
Note
Transfer flight level
| Link | Semantic Value |
|---|---|
| Term | transfer flight level |
| Status |
|
| Mandatory for |
|
| Contexts |
|
| Categories |
|
| Synonyms |
|
| Related entries |
|
| Broader term | |
| Narrower term |
|
Abbreviation
Definition
1. the flight level agreed during the coordination if in level flight, or the cleared flight level to which the flight is proceeding if climbing or descending at the coordination point.
2. The flight level at which a flight has been or will be coordinated to cross one point (flight level number); if in level flight, or the cleared level to which it is proceeding if climbing or descending at the boundary point.
Definition Source
1. EUROPEAN COMMISSION (2006) COMMISSION REGULATION (EC) No 1032/2006 of 6 July 2006 laying down requirements for automatic systems for the exchange of flight data for the purpose of notification, coordination and transfer of flights between air traffic control units, Definitions
2. EUROCONTROL Standard Document For On-Line Data Interchange (OLDI), Edition Number : 3.00, Edition Date : 31/10/2003
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Uncontrolled aerodrome
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| Term | uncontrolled aerodrome |
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Abbreviation
Definition
An aerodrome at which a control tower has not been established. This designation also applies during the non-operational period when an established control tower is on reduced hours (part time).
Definition Source
Transport Canada - Glossary http://www.tc.gc.ca/
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Upper Flight Information Region
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| Term | Upper Flight Information Region |
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Upper Information Region |
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Abbreviation
UIR
Definition
a Flight Information Region, which covers upper airspace only.
Definition Source
EUROCONTROL (2005) Glossary for Flight Statistics & Forecasts, v. 1.0 [3]
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Upper airspace
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| Term | upper airspace |
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Abbreviation
Definition
1. Part of airspace above a variable vertical limit.
2. controlled airspace used mainly by jets in the cruise flight phase.
Definition Source
1. EUROCONTROL (2005) Glossary for Flight Statistics & Forecasts, v1.0 [4]
2. EUROCONTROL/EUROPEAN UNION (2009) EPISODE 3 - Single European Sky Implementation support through Validation, D2.4.3-04 - Method for Systematic Risk Assessment for Units of Operation, V. 1.01
Note
In Europe, the Upper Information Region (UIR) is defined as airspace above a division level (generally FL195). It may vary in different countries. Maastricht Upper Area Control Centre (MUAC) covers airspace above FL245 in Belgium, the Netherlands, Luxembourg and NW Germany. In the USA, UIRs are not used, but high altitude en-route sectors typically begin at FL240. Upper airspace is controlled through area control centres (ACC) in Europe or ATC centres (ATCC) in the USA. Categorisation varies, e.g. Class C in most of ECAC; Class B in the UK until 2006; and Class A in the USA.
Note Source
EPISODE 3 (see above)
Vertical separation
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| Term | vertical separation |
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Abbreviation
Definition
Separation between aircraft expressed in units of vertical distance
Definition Source
ICAO DOC 9426 Air Traffic Services Planning Manual 1984, p. V-1-1-10
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Visual Flight Rules
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| Term | Visual Flight Rules |
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Abbreviation
VFR
Definition
A set of rules governing the conduct of flight under visual meteorological conditions.
Definition Source
ICAO Reference DOC 9815 Manual on Laser Emitters and Flight Safety 2003, 1st ed.
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