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ADS-B (Automatic Dependent Surveillance-Broadcast)
A surveillance technology in which aircraft broadcast GPS-derived position and other data. ADS-B Out is required in much of controlled airspace; ADS-B In can deliver traffic and datalink weather that pilots use for strategic in-flight decisions, not close tactical maneuvering.
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- Advisory Circular (AC)An FAA publication that provides non-regulatory guidance on aviation subjects such as certification, currency, and training standards. Advisory Circulars like AC 61-65 (endorsements) and AC 61-98 (flight review) explain how to meet the regulations in practice.
- AFM (Airplane Flight Manual)The FAA-approved flight manual for an airplane that contains operating limitations, procedures, and performance information. Under 14 CFR 91.9, pilots must comply with the AFM or approved POH limitations, and the required manuals must be available in the aircraft when the type design requires them.
- AGL (Above Ground Level)A measurement of altitude expressed in feet above the terrain or ground directly below the aircraft. AGL is commonly used for traffic pattern altitudes and obstacle clearance.
- AileronA hinged flight control surface on the trailing edge of each wing that controls the aircraft's roll about its longitudinal axis. Moving the control yoke or stick left or right deflects the ailerons in opposite directions.