Pilot/Controller Glossary 

4/20/23 

ACTUAL NAVIGATION PERFORMANCE (ANP)

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(See REQUIRED NAVIGATION PERFORMANCE.) 

ADAPTED ROUTES

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 Departure and/or arrival routes that are adapted in ARTCC ERAM computers to 

accomplish inter/intrafacility controller coordination and to ensure that flight data is posted at the proper control 

positions. Adapted routes are automatically applied to flight plans where appropriate. When the workload or 

traffic situation permits, controllers may provide radar vectors or assign requested routes to minimize circuitous 

routing. Adapted routes are usually confined to one ARTCC’s area and are referred to by the following names 

or abbreviations: 

a. 

Adapted Arrival Route (AAR). A specific arrival route from an appropriate en route point to an airport or 

terminal area. It may be included in a Standard Terminal Arrival (STAR) or a Preferred IFR Route. 

b. 

Adapted Departure Route (ADR). A specific departure route from an airport or terminal area to an en route 

point where there is no further need for flow control. It may be included in an Instrument Departure Procedure 

(DP) or a Preferred IFR Route. 

c. 

Adapted Departure and Arrival Route (ADAR). A route between two terminals which are within or 

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 services 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 Administrator 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.) 

PCG A

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