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Terms for subject Aviation (1801 entries)

assigned arrival time	The arrival time assigned to an aircraft landing at a specific airport that is based on the area control centre’s (ACC) estimates and recalculated to resolve simultaneous demands at the airport
assigned departure time	The departure time assigned to an aircraft, derived from its estimated time en route, that enables compliance with an issued arrival time at the destination airport
asynchronous balanced mode	A balanced operational mode in which a data link connection has been established between two service access points. Either data link entity can send commands at anytime and initiate responses without receiving permission from the peer data link entity on the connection.
ATC clearance	An authorization issued by an ATC unit for an aircraft to proceed within controlled airspace in accordance with the conditions specified by that unit
ATC Contingency Command Post	A facility which enables the Federal Aviation Administration (FAA) to manage the ATC system when significant portions of the system’s capabilities have been lost or are threatened
ATC service	A service provided for the purposes of (a) preventing collisions between (i) aircraft; (ii) aircraft and obstacles; and (iii) aircraft and vehicles on the manoeuvring area; and (b) expediting and maintaining an orderly flow of air traffic
ATC unit	As the circumstances require, this may be (a) an area control centre (ACC) established to provide ATC service to aircraft; or (b) an airport control tower unit established to provide ATC service to airport traffic
ATC-assigned airspace	Airspace of defined vertical and lateral limits assigned by ATC for the purpose of providing air traffic segregation between the specified activities being conducted within the assigned airspace and other IFR air traffic
ATR	air turbo-rocket engine
ATS interfacility data communication	Automated data exchange between air traffic service units, particularly in regard to coordination and transfer of flights
ATS operating irregularity	A situation that occurs when ATS are being provided and when a preliminary investigation indicates that a hazardous situation or loss of separation may have occurred
attack axis	An orientation direction usually thought of as an imaginary line passing through the target on some particular heading example, the range run-in heading
attack geometry	The spatial relationship between an attacking pilot and his quarry
attack restriction	Ingress, ordnance delivery, or egress restrictions depending on situation
authorised release certificate	authorized release certificate	bonly
authorised release certificate	authorized release certificate	bonly
A / THR	auto thrust	Intere­x
automated weather observation system	A set of meteorological sensors and associated systems designed to electronically collect and disseminate meteorological data
automatic altitude reporting	The function of a transponder that responds to Mode C interrogations by transmitting the aircraft’s altitude in 1OO-ft increments
automatic dependent surveillance	A surveillance technique in which aircraft automatically provide, via a data link, data derived from on-board navigation and position-fixing systems, including aircraft identification, four-dimensional position and additional data as appropriate