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