Pilot/Controller Glossary Pilot/Controller Glossary  8/15/19 1/30/20  clearance and other pertinent information is provided  in the approach clearance when required.  (See CLEARED APPROACH.)  (See INSTRUMENT APPROACH  PROCEDURE.)  (Refer to AIM.)  (Refer to 14 CFR Part 91.)  APPROACH CONTROL FACILITY- A terminal  ATC facility that provides approach control service in  a terminal area.  (See APPROACH CONTROL SERVICE.)  (See RADAR APPROACH CONTROL  FACILITY.)  APPROACH CONTROL SERVICE- Air traffic  control service provided by an approach control  facility for arriving and departing VFR/IFR aircraft  and, on occasion, en route aircraft. At some airports  not served by an approach control facility, the  ARTCC provides limited approach control service.  (See ICAO term APPROACH CONTROL  SERVICE.)  (Refer to AIM.)  APPROACH CONTROL SERVICE [ICAO]- Air  traffic control service for arriving or departing  controlled flights.  APPROACH GATE- An imaginary point used  within ATC as a basis for vectoring aircraft to the  final approach course. The gate will be established  along the final approach course 1 mile from the final  approach fix on the side away from the airport and  will be no closer than 5 miles from the landing  threshold.  APPROACH/DEPARTURE HOLD AREA- The  locations on taxiways in the approach or departure  areas of a runway designated to protect landing or  departing aircraft. These locations are identified by  signs and markings.  APPROACH LIGHT SYSTEM- (See AIRPORT LIGHTING.)  APPROACH SEQUENCE- The order in which  aircraft are positioned while on approach or awaiting  approach clearance.  (See LANDING SEQUENCE.)  (See ICAO term APPROACH SEQUENCE.)  APPROACH SEQUENCE [ICAO]- The order in  which two or more aircraft are cleared to approach to  land at the aerodrome.  APPROACH SPEED- The recommended speed  contained in aircraft manuals used by pilots when  making an approach to landing. This speed will vary  for different segments of an approach as well as for  aircraft weight and configuration.  APPROACH WITH VERTICAL GUIDANCE  (APV)– A term used to describe RNAV approach  procedures that provide lateral and vertical guidance  but do not meet the requirements to be considered a  precision approach.  APPROPRIATE ATS AUTHORITY [ICAO]- The  relevant authority designated by the State responsible  for providing air traffic services in the airspace  concerned. In the United States, the “appropriate ATS  authority” is the Program Director for Air Traffic  Planning and Procedures, ATP-1.  APPROPRIATE AUTHORITY- a.  Regarding flight over the high seas: the relevant  authority is the State of Registry.  b.  Regarding flight over other than the high seas:  the relevant authority is the State having sovereignty  over the territory being overflown.  APPROPRIATE OBSTACLE CLEARANCE  MINIMUM ALTITUDE- Any of the following:  (See MINIMUM EN ROUTE IFR ALTITUDE.)  (See MINIMUM IFR ALTITUDE.)  (See MINIMUM OBSTRUCTION CLEARANCE  ALTITUDE.)  (See MINIMUM VECTORING ALTITUDE.)  APPROPRIATE TERRAIN CLEARANCE MINIMUM ALTITUDE- Any of the following:  (See MINIMUM EN ROUTE IFR ALTITUDE.)  (See MINIMUM IFR ALTITUDE.)  (See MINIMUM OBSTRUCTION CLEARANCE  ALTITUDE.)  (See MINIMUM VECTORING ALTITUDE.)  APRON- A defined area on an airport or heliport  intended to accommodate aircraft for purposes of  loading or unloading passengers or cargo, refueling,  parking, or maintenance. With regard to seaplanes, a  ramp is used for access to the apron from the water.  (See ICAO term APRON.)  APRON [ICAO]- A defined area, on a land  aerodrome, intended to accommodate aircraft for  purposes of loading or unloading passengers, mail or  cargo, refueling, parking or maintenance.  ARC- The track over the ground of an aircraft flying  at a constant distance from a navigational aid by  reference to distance measuring equipment (DME).  PCG A-11 