PROCEDURES FOR AIR NAVIGATION SERVICES
PART I. DEFINITIONS
Note.— Throughout the text of this document the term “service” is used as an abstract noun to designate functions, or service rendered; the term “unit” is used to designate a collective body performing a service.
When the following terms are used in the present document they have the following meanings:
Accepting unit/controller. Air traffic control unit/air traffic controller next to take control of an aircraft.
Note.— See definition of “transferring unit/ controller”.
ADS agreement. An ADS reporting plan which establishes the conditions of ADS data reporting (i.e. data required by the air traffic services unit and frequency of ADS reports which have to be agreed to prior to the provision of the ADS services).
Note.— The terms of the agreement will be exchanged between the ground system and the aircraft by means of a contract, or a series of contracts.
ADS contract. A means by which the terms of an ADS agreement will be exchanged between the ground system and the aircraft, specifying under what conditions ADS reports would be initiated, and what data would be contained in the reports.
Note.— The term “ADS contract” is a generic term meaning variously, ADS event contract, ADS demand contract, ADS periodic contract or an emergency mode. Ground forwarding of ADS reports may be implemented between ground systems.
ADS service. A service using aircraft information provided by means of automatic dependent surveillance.
Advisory airspace. An airspace of defined dimensions, or designated route, within which air traffic advisory service is available.
Advisory route. A designated route along which air traffic advisory service is available.
Note.— Air traffic control service provides a much more complete service than air traffic advisory service; advisory areas and routes are therefore not established within controlled airspace, but air traffic advisory service may be provided below and above control areas.
Aerodrome. A defined area on land or water (including any buildings, installations and equipment) intended to be used either wholly or in part for the arrival, departure and surface movement of aircraft.
Note.— The term “aerodrome” where used in the provisions relating to flight plans and ATS messages is intended to cover also sites other than aerodromes which may be used by certain types of aircraft, e.g. helicopters or balloons.
Aerodrome control service. Air traffic control service for aerodrome traffic.
Aerodrome control tower. A unit established to provide air traffic control service to aerodrome traffic.
Aerodrome elevation. The elevation of the highest point of the landing area.
Aerodrome taxi circuit. The specified path of aircraft on the manoeuvring area during specific wind conditions.
Aerodrome traffic. All traffic on the manoeuvring area of an aerodrome and all aircraft flying in the vicinity of an aerodrome.
Note.— An aircraft is in the vicinity of an aerodrome when it is in, entering or leaving an aerodrome traffic circuit.
Aerodrome traffic circuit. The specified path to be flown by aircraft operating in the vicinity of an aerodrome.
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