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Adverse Yaw
The tendency of an airplane to yaw opposite the direction of aileron roll because of unequal induced drag between the up-going and down-going wings. Adverse yaw is corrected with coordinated rudder during roll-in and roll-out and is distinct from left-turning tendency, which always pulls left under high power and low airspeed.
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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.