Aeronautical chart.  A map used in air navigation containing  all or part of the following: topographic features, hazards and  obstructions, navigation aids, navigation routes, designated  airspace, and airports.  Airplane Flight Manual (AFM).  A document developed  by the airplane manufacturer and approved by the Federal  Aviation Administration (FAA). It is specific to a particular  make and model airplane by serial number and it contains  operating procedures and limitations.  Aeronautical decision-making (ADM).  A systematic  approach to the mental process used by pilots to consistently  determine the best course of action in response to a given  set of circumstances.  Agonic line.  An irregular imaginary line across the surface of  the Earth along which the magnetic and geographic poles are  in alignment, and along which there is no magnetic variation.  Ailerons.  Primary flight control surfaces mounted on the  trailing edge of an airplane wing, near the tip. Ailerons control  roll about the longitudinal axis.  Aircraft.  A device that is used, or intended to be used, for  flight.  Aircraft altitude.  The actual height above sea level at which  the aircraft is flying.  Aircraft approach category.  A performance grouping of  aircraft based on a speed of 1.3 times the stall speed in the  landing configuration at maximum gross landing weight.  Air data computer (ADC).  An aircraft computer that  receives and processes pitot pressure, static pressure, and  temperature to calculate very precise altitude, indicated  airspeed, true airspeed, and air temperature.  Airfoil.  Any surface, such as a wing, propeller, rudder, or  even a trim tab, which provides aerodynamic force when it  interacts with a moving stream of air.  Air mass.  An extensive body of air having fairly uniform  properties of temperature and moisture.  AIRMET.  Inflight weather advisory issued as an amendment  to the area forecast, concerning weather phenomena of  operational interest to all aircraft and that is potentially  hazardous to aircraft with limited capability due to lack of  equipment, instrumentation, or pilot qualifications.  Airplane.  An engine-driven, fixed-wing aircraft heavier than  air that is supported in flight by the dynamic reaction of air  against its wings.  Airspeed.  Rate of the aircraft’s progress through the air.  Air route traffic control center (ARTCC).  Provides ATC  service to aircraft operating on IFR flight plans within  controlled airspace and principally during the en route phase  of flight.  Air route surveillance radar (ARSR).  Air route traffic  control center (ARTCC) radar used primarily to detect  and display an aircraft’s position while en route between  terminal areas.  Airport surveillance radar approach.  An instrument  approach in which ATC issues instructions for pilot  compliance based on aircraft position in relation to the final  approach course and the distance from the end of the runway  as displayed on the controller’s radar scope.  Airport surveillance radar (ASR).  Approach control  radar used to detect and display an aircraft’s position in the  terminal area.  Airport surface detection equipment (ASDE).  Radar  equipment specifically designed to detect all principal  features and traffic on the surface of an airport, presenting the  entire image on the control tower console; used to augment  visual observation by tower personnel of aircraft and/or  vehicular movements on runways and taxiways.  Airplane Owner/Information Manual.  A document  developed by the airplane manufacturer containing general  information about the make and model of an airplane. The  airplane owner’s manual is not FAA approved and is not  specific to a particular serial numbered airplane. This manual  is not kept current, and therefore cannot be substituted for  the AFM/POH.  Airport diagram.  The section of an instrument approach  procedure chart that shows a detailed diagram of the  airport. This diagram includes surface features and airport  configuration information.  Airport/Facility Directory (A/FD).  See Chart Supplement  U.S.  G-2 