8/15/19 12/31/20  Pilot/Controller Glossary Pilot/Controller Glossary  support of the DHS, the DOD, or other Federal  security elements in the interest of national security.  Such security services are only applicable within  designated areas. ATC security services do not  include ATC basic radar services or flight following.  ATC SECURITY SERVICES POSITION- The  position responsible for providing ATC security  services as defined. This position does not provide  ATC, IFR separation, or VFR flight following  services, but is responsible for providing security  services in an area comprising airspace assigned to  one or more ATC operating sectors. This position  may be combined with control positions.  ATC SECURITY TRACKING- The continuous  tracking of aircraft movement by an ATC facility in  support of the DHS, the DOD, or other security  elements for national security using radar (i.e., radar  tracking) or other means (e.g., manual tracking)  without providing basic radar services (including  traffic advisories) or other ATC services not defined  in this section.  ATS SURVEILLANCE SERVICE [ICAO]– A term  used to indicate a service provided directly by means  of an ATS surveillance system.  ATC SURVEILLANCE SOURCE– Used by ATC  for establishing identification, control and separation  using a target depicted on an air traffic control  facility's video display that has met the relevant  safety standards for operational use and received  from one, or a combination, of the following  surveillance sources:  a. Radar (See RADAR.)  b. ADS-B (See AUTOMATIC DEPENDENT  SURVEILLANCE-BROADCAST.)  c. WAM (See WIDE AREA MULTILATERATION.)  (See INTERROGATOR.)  (See TRANSPONDER.)  (See ICAO term RADAR.)  (Refer to AIM.)  ATS SURVEILLANCE SYSTEM [ICAO]– A  generic term meaning variously, ADS-B, PSR, SSR  or any comparable ground-based system that enables  the identification of aircraft.  Note: A comparable ground-based system is one  that has been demonstrated, by comparative  assessment or other methodology, to have a level  of safety and performance equal to or better than  monopulse SSR.  AUTOMATED INFORMATION TRANSFER  (AIT)- A precoordinated process, specifically  defined in facility directives, during which a transfer  of altitude control and/or radar identification is  accomplished without verbal coordination between  controllers using information communicated in a full  data block.  ATCAA- (See ATC ASSIGNED AIRSPACE.)  ATCRBS- (See RADAR.)  ATCSCC- (See AIR TRAFFIC CONTROL SYSTEM  COMMAND CENTER.)  ATCT- (See TOWER.)  ATD- (See ALONG-TRACK DISTANCE.)  ATIS- (See AUTOMATIC TERMINAL INFORMATION  SERVICE.)  ATIS [ICAO]- (See ICAO Term AUTOMATIC TERMINAL  INFORMATION SERVICE.)  ATS ROUTE [ICAO]- A specified route designed for  channeling the flow of traffic as necessary for the  provision of air traffic services.  Note: The term “ATS Route” is used to mean  variously, airway, advisory route, controlled or  uncontrolled route, arrival or departure, etc.  ATTENTION ALL USERS PAGE (AAUP)- The  AAUP provides the pilot with additional information  relative to conducting a specific operation, for  example, PRM approaches and RNAV departures.  AUTOLAND APPROACH-An autoland system  aids by providing control of aircraft systems during  a precision instrument approach to at least decision  altitude and possibly all the way to touchdown, as  well as in some cases, through the landing rollout.  The autoland system is a sub-system of the autopilot  system from which control surface management  occurs. The aircraft autopilot sends instructions to the  autoland system and monitors the autoland system  performance and integrity during its execution.  AUTOMATED EMERGENCY DESCENT- (See EMERGENCY DESCENT MODE.)  PCG A-14 