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Pilot/Controller Glossary 

12/2/21 

ATC SECURITY SERVICES

 Communications 

and security tracking provided by an ATC facility in 
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. 

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.) 

ATPA

 

(See AUTOMATED TERMINAL PROXIMITY 

ALERT.) 

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.) 

AUTOMATED INFORMATION TRANSFER 
(AIT)

 A precoordinated process, specifically 

PCG A

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