Pilot/Controller Glossary 

5/19/22 

immediately adjacent to one ARTCC’s area. ADARs 
are similar to Preferred IFR Routes and may share 
components, but they are not synonymous. 

(See PREFFERED IFR ROUTES.) 

ADAR

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(See ADAPTED ROUTES.) 

ADDITIONAL SERVICES

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 Advisory information 

provided by ATC which includes but is not limited to 
the following: 

a. 

Traffic advisories. 

b. 

Vectors, when requested by the pilot, to assist 

aircraft receiving traffic advisories to avoid observed 
traffic. 

c. 

Altitude deviation information of 300 feet or 

more from an assigned altitude as observed on a 
verified (reading correctly) automatic altitude 
readout (Mode C). 

d. 

Advisories that traffic is no longer a factor. 

e. 

Weather and chaff information. 

f. 

Weather assistance. 

g. 

Bird activity information. 

h. 

Holding pattern surveillance. Additional ser-

vices are provided to the extent possible contingent 
only upon the controller’s capability to fit them into 
the performance of higher priority duties and on the 
basis of limitations of the radar, volume of traffic, 
frequency congestion, and controller workload. The 
controller has complete discretion for determining if 
he/she is able to provide or continue to provide a 
service in a particular case. The controller’s reason 
not to provide or continue to provide a service in a 
particular case is not subject to question by the pilot 
and need not be made known to him/her. 

(See TRAFFIC ADVISORIES.) 
(Refer to AIM.) 

ADF

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(See AUTOMATIC DIRECTION FINDER.) 

ADIZ

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(See AIR DEFENSE IDENTIFICATION ZONE.) 

ADLY

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(See ARRIVAL DELAY.) 

ADMINISTRATOR

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 The Federal Aviation Admin-

istrator or any person to whom he/she has delegated 
his/her authority in the matter concerned. 

ADR

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(See ADAPTED ROUTES.) 
(See AIRPORT DEPARTURE RATE.) 

ADS [ICAO]

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(See ICAO term AUTOMATIC DEPENDENT 

SURVEILLANCE.) 

ADS

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B

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(See AUTOMATIC DEPENDENT 

SURVEILLANCE

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BROADCAST.) 

ADS

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C

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(See AUTOMATIC DEPENDENT 

SURVEILLANCE

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CONTRACT.) 

ADVISE INTENTIONS

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 Tell me what you plan to 

do. 

ADVISORY

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 Advice and information provided to 

assist pilots in the safe conduct of flight and aircraft 
movement. 

(See ADVISORY SERVICE.) 

ADVISORY FREQUENCY

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 The appropriate fre-

quency to be used for Airport Advisory Service. 

(See LOCAL AIRPORT ADVISORY.) 
(See UNICOM.) 
(Refer to ADVISORY CIRCULAR NO. 90-66.) 
(Refer to AIM.) 

ADVISORY SERVICE

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 Advice and information 

provided by a facility to assist pilots in the safe 
conduct of flight and aircraft movement. 

(See ADDITIONAL SERVICES.) 
(See LOCAL AIRPORT ADVISORY.) 
(See RADAR ADVISORY.) 
(See SAFETY ALERT.) 
(See TRAFFIC ADVISORIES.) 
(Refer to AIM.) 

ADW

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(See ARRIVAL DEPARTURE WINDOW) 

AERIAL REFUELING

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 A procedure used by the 

military to transfer fuel from one aircraft to another 
during flight. 

(Refer to VFR/IFR Wall Planning Charts.) 

AERODROME

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 A defined area on land or water 

(including any buildings, installations and equip-
ment) intended to be used either wholly or in part for 
the arrival, departure, and movement of aircraft. 

AERODROME BEACON [ICAO]

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 Aeronautical 

beacon used to indicate the location of an aerodrome 
from the air. 

PCG A

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