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12/2/21 

Pilot/Controller Glossary 

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. 

AUTOMATED MUTUAL-ASSISTANCE VESSEL 
RESCUE SYSTEM

 A facility which can deliver, in 

a matter of minutes, a surface picture (SURPIC) of 
vessels in the area of a potential or actual search and 
rescue incident, including their predicted positions 
and their characteristics. 

(See FAA Order JO 7110.65, Para 10

6

4, 

INFLIGHT CONTINGENCIES.) 

AUTOMATED PROBLEM DETECTION (APD)

 

An Automation Processing capability that compares 
trajectories in order to predict conflicts. 

AUTOMATED PROBLEM DETECTION 
BOUNDARY (APB)

 The adapted distance beyond 

a facilities boundary defining the airspace within 
which EDST performs conflict detection. 

(See EN ROUTE DECISION SUPPORT TOOL.) 

AUTOMATED PROBLEM DETECTION INHIB-
ITED AREA (APDIA)

 Airspace surrounding a 

terminal area within which APD is inhibited for all 
flights within that airspace. 

AUTOMATED TERMINAL PROXIMITY ALERT 
(ATPA)

 Monitors the separation of aircraft on the 

Final Approach Course (FAC), displaying a 
graphical notification (cone and/or mileage) when a 
potential loss of separation is detected. The warning 
cone (Yellow) will display at 45 seconds and the alert 
cone (Red) will display at 24 seconds prior to 
predicted loss of separation. Current distance 
between two aircraft on final will be displayed in line 
3 of the full data block of the trailing aircraft in 
corresponding colors. 

AUTOMATED WEATHER SYSTEM

 Any of the 

automated weather sensor platforms that collect 
weather data at airports and disseminate the weather 
information via radio and/or landline. The systems 
currently consist of the Automated Surface Observ-
ing System (ASOS) and Automated Weather 
Observation System (AWOS). 

AUTOMATED UNICOM

 Provides completely 

automated weather, radio check capability and airport 

advisory information on an Automated UNICOM 
system. These systems offer a variety of features, 
typically selectable by microphone clicks, on the 
UNICOM frequency. Availability will be published 
in the Chart Supplement U.S. and approach charts. 

AUTOMATIC ALTITUDE REPORT

 

(See ALTITUDE READOUT.) 

AUTOMATIC ALTITUDE REPORTING

 That 

function of a transponder which responds to Mode C 
interrogations by transmitting the aircraft’s altitude 
in 100-foot increments. 

AUTOMATIC CARRIER LANDING SYSTEM

 

U.S. Navy final approach equipment consisting of 
precision tracking radar coupled to a computer data 
link to provide continuous information to the aircraft, 
monitoring capability to the pilot, and a backup 
approach system. 

AUTOMATIC DEPENDENT SURVEILLANCE 
(ADS) [ICAO]

 A surveillance technique in which 

aircraft automatically provide, via a data link, data 
derived from on

board navigation and position 

fixing systems, including aircraft identification, four 
dimensional position and additional data as 
appropriate. 

AUTOMATIC  DEPENDENT SURVEILLANCE

 

BROADCAST (ADS-B)

 A surveillance system in 

which an aircraft or vehicle to be detected is fitted 
with cooperative equipment in the form of a data link 
transmitter. The aircraft or vehicle periodically 
broadcasts its GNSS

derived position and other 

required information such as identity and velocity, 
which is then received by a ground

based or 

space

based receiver for processing and display at an 

air traffic control facility, as well as by suitably 
equipped aircraft. 

(See AUTOMATIC DEPENDENT 

SURVEILLANCE

BROADCAST IN.) 

(See AUTOMATIC DEPENDENT 

SURVEILLANCE

BROADCAST OUT.) 

(See COOPERATIVE SURVEILLANCE.) 
(See GLOBAL POSITIONING SYSTEM.) 
(See SPACE

BASED ADS

B.) 

AUTOMATIC  DEPENDENT SURVEILLANCE

 

BROADCAST IN (ADS

B In)

 Aircraft avionics 

capable of receiving ADS

B Out transmissions 

directly from other aircraft, as well as traffic or 

PCG A

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