Glossary

Angle of incidence. The acute angle formed between the Asymmetric thrust. Also known as P-factor. A tendency for chord line of an airfoil and the longitudinal axis of the aircraft an aircraft to yaw to the left due to the descending propeller on which it is mounted. blade on the right producing more thrust than the ascending blade on the left. This occurs when the aircraft’s longitudinal Anhedral. A downward slant from root to tip of an aircraft’s axis is in a climbing attitude in relation to the relative wind. wing or horizontal tail surface. The P-factor would be to the right if the aircraft had a counterclockwise rotating propeller. Annual inspection. A complete inspection of an aircraft and engine, required by the Code of Federal Regulations, to be ATC. Air Traffic Control. accomplished every 12 calendar months on all certificated aircraft. Only an A&P technician holding an Inspection ATCRBS. See air traffic control radar beacon system. Authorization can conduct an annual inspection. ATIS. See automatic terminal information service. Anti-ice. Preventing the accumulation of ice on an aircraft structure via a system designed for that purpose. Atmospheric propagation delay. A bending of the electromagnetic (EM) wave from the satellite that creates Antiservo tab. An adjustable tab attached to the trailing edge an error in the GPS system. of a stabilator that moves in the same direction as the primary control. It is used to make the stabilator less sensitive. Attitude. A personal motivational predisposition to respond to persons, situations, or events in a given manner that can, Approach lighting system (ALS). Provides lights that will nevertheless, be changed or modified through training as sort penetrate the atmosphere far enough from touchdown to of a mental shortcut to decision-making. give directional, distance, and glidepath information for safe transition from instrument to visual flight. Attitude and heading reference system (AHRS). A system composed of three-axis sensors that provide heading, attitude, Area chart. Part of the low-altitude en route chart series, and yaw information for aircraft. AHRS are designed to this chart furnishes terminal data at a larger scale for replace traditional mechanical gyroscopic flight instruments congested areas. and provide superior reliability and accuracy. Area forecast (FA). A report that gives a picture of clouds, Attitude director indicator (ADI). An aircraft attitude general weather conditions, and visual meteorological indicator that incorporates flight command bars to provide conditions (VMC) expected over a large area encompassing pitch and roll commands. several states. Attitude indicator. The foundation for all instrument flight, Area navigation (RNAV). Allows a pilot to fly a selected this instrument reflects the airplane’s attitude in relation to course to a predetermined point without the need to overfly the horizon. ground-based navigation facilities, by using waypoints. Attitude instrument flying. Controlling the aircraft by Arm. See moment arm. reference to the instruments rather than by outside visual cues. ARSR. See air route surveillance radar. Attitude management. The ability to recognize hazardous attitudes in oneself and the willingness to modify them as ARTCC. See air route traffic control center. necessary through the application of an appropriate antidote thought. ASDE. See airport surface detection equipment. Autokinesis. Nighttime visual illusion that a stationary light ASOS. See Automated Surface Observing System. is moving, which becomes apparent after several seconds of staring at the light. Aspect ratio. Span of a wing divided by its average chord. ASR. See airport surveillance radar. G-4