Glossary of Terms

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Aeronautical fixed telecommunication network (AFTN). A worldwide system of aeronautical fixed circuits provided, as
part of the aeronautical fixed service, for the exchange of messages and/or digital data between aeronautical fixed
stations having the same or compatible communications characteristics.


Aeronautical Information Publication (AIP). A publication issued by or with the authority of a State and containing
aeronautical information of a lasting character essential to air navigation

AIP Supplement

AIP Supplement. Temporary changes to the information contained in the AIP which are published by means of special pages

Air operator’s certificate

“air operator’s certificate” (AOC) means a certificate authorising an operator to
carry out specified commercial air transport operations.

Air traffic

“air traffic” means all aircraft in flight or operating on the manoeuvring area of an

Air traffic advisory service

“air traffic advisory service” means a service provided by the appropriate ATS authority
within advisory airspace to ensure separation, in so far as practical, between aircraft which
are operating on IFR flight plans.

Air traffic control clearance

“air traffic control clearance” means authorisation for an aircraft to proceed under
conditions specified by an air traffic control unit. The term may be abbreviated to
“clearance” and may be prefixed by the word “taxi”, “take-off”, “departure”, “en-route”,
“approach”, or “landing”, to indicate the particular portion of flight to which the air traffic
control clearance relates;

Air traffic control service

“air traffic control service” means a service provided for the purpose of:

(a) preventing collisions between aircraft, and on the manoeuvring area, between
aircraft and obstructions, and

(b) expediting and maintaining an orderly flow of air traffic.

Air traffic service

“air traffic service” (ATS) includes the following services, namely, flight information
service, alerting service, air traffic advisory service, air traffic control service, area control
service, approach control service and aerodrome control service.

Air traffic services airspaces

“air traffic services airspaces” means airspaces of dimensions defined and alphabetically
designated by the appropriate ATS authority within which specific types of flights may
operate and for which air traffic services and rules of operation are specified.

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