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6/17/21 

Pilot/Controller Glossary 

APB

 

(See AUTOMATED PROBLEM DETECTION 

BOUNDARY.) 

APD

 

(See AUTOMATED PROBLEM DETECTION.) 

APDIA

 

(See AUTOMATED PROBLEM DETECTION 

INHIBITED AREA.) 

APPROACH CLEARANCE

 Authorization by 

ATC for a pilot to conduct an instrument approach. 
The type of instrument approach for which a 
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.) 

PCG A

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