ACKNOWLEDGE (ICAO) - Let me know that you have received and understand this message.
ACROBATIC FLIGHT (P/CG) - An intentional maneuver involving an abrupt change in an aircraft's attitude, an abnormal attitude, or abnormal acceleration, not necessary for normal flight. (Refer to Federal Air Regulations Part 91)
ACROBATIC FLIGHT (ICAO) - Maneuvers intentionally performed by an aircraft involving an abrupt change in its attitude, an abnormal attitude or abnormal variation in speed.
ADDITIONAL SERVICES - Advisory information provided by Air Traffic Control which includes but is not limited to the following:
(1) Traffic advisories.
(2)
Vectors, when requested by the pilot, to assist aircraft receiving traffic advisories to avoid observed traffic.
(3)
Altitude deviation information of 300 feet or more from an assigned altitude as observed on a verified (reading correctly) automatic altitude readout (Mode C).
(4)
Advisories that traffic is no longer a factor.
(5)
Weather and chaff information.
(6)
Weather assistance.
(7)
Bird activity information.
(8)
Holding pattern surveillance.
Additional services are provided to the extent possible contingent only upon the controller's capability to fit them into the performance of higher priority duties and on the basis of limitations of the radar, volume of traffic, frequency congestion and controller workload. The controller has complete discretion for determining if he is able to provide or continue to provide a service in a particular case. The controller's reason not to provide or continue to provide a service in a particular case is not subject to question by the pilot and need not be made known to him. (See Traffic Advisories)
ADMINISTRATOR - The Federal Aviation Administrator or any person to whom he has delegated his authority in the matter concerned.
ADVISE INTENTIONS - Tell me what you plan to do.
ADVISORY - Advice and information provided to assist pilot in the safe conduct of flight and aircraft movement. (See Advisory Service)
ADVISORY AREA (JCS, NATO, ICAO) - A designated area within a Flight Information Region where Air Traffic Advisory Service is available.
ADVISORY FREQUENCY - The appropriate frequency to be used for Airport Advisory Service. (See Airport Advisory Service and UNICOM) (Refer to Advisory Circular No. 90-42)
ADVISORY ROUTE/ADR (ICAO) - A route within a Flight Information Region 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.
ADVISORY SERVICE - Advice and information provided by a facility to assist pilots in the safe conduct of flight and aircraft movement. (See Airport Advisory Service, Traffic Advisories, Safety Alerts, Additional Services, Radar Advisory, Enroute Flight Advisory Service)
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