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Aeronautical Information Manual (AIM), page 613

5/26/16
12/10/15

procedures forbid compliance with the clearance
issued. Pilots may also request clarification or
amendment, as appropriate, any time a clearance is
not fully understood, or considered unacceptable
because of safety of flight. Controllers should, in
such instances and to the extent of operational

practicality and safety, honor the pilot's request.

14 CFR Part 91.3(a) states: "The pilot in command

of an aircraft is directly responsible for, and is the

final authority as to, the operation of that aircraft."

THE PILOT IS RESPONSIBLE TO REQUEST AN

AMENDED CLEARANCE if ATC issues a

clearance that would cause a pilot to deviate from a
rule or regulation, or in the pilot's opinion, would
place the aircraft in jeopardy.

(See ATC INSTRUCTIONS.)

(See ICAO term AIR TRAFFIC CONTROL

CLEARANCE.)

AIR TRAFFIC CONTROL- A service operated by
appropriate authority to promote the safe, orderly and
expeditious flow of air traffic.
(See ICAO term AIR TRAFFIC CONTROL

SERVICE.)

AIR TRAFFIC CONTROL CLEARANCE [ICAO]-
Authorization for an aircraft to proceed under
conditions specified by an air traffic control unit.
Note 1: For convenience, the term air traffic control
clearance is frequently abbreviated to clearance
when used in appropriate contexts.

Note 2: The abbreviated term clearance may be
prefixed by the words taxi, takeoff, departure, en
route, approach or landing to indicate the particular
portion of flight to which the air traffic control clear-
ance relates.

AIR TRAFFIC CONTROL SERVICE-
(See AIR TRAFFIC CONTROL.)

AIR TRAFFIC CONTROL SERVICE [ICAO]- A
service provided for the purpose of:

a. Preventing collisions:

1. Between aircraft; and
2. On the maneuvering area between aircraft
and obstructions.

b. Expediting and maintaining an orderly flow of
air traffic.
Pilot/Controller Glossary

AIR TRAFFIC CONTROL SPECIALIST- A person
authorized to provide air traffic control service.
(See AIR TRAFFIC CONTROL.)
(See FLIGHT SERVICE STATION.)
(See ICAO term CONTROLLER.)

AIR TRAFFIC CONTROL SYSTEM COMMAND

CENTER (ATCSCC) - An Air Traffic Tactical

Operations facility responsible for monitoring and

managing the flow of air traffic throughout the NAS,

producing a safe, orderly, and expeditious flow of

traffic while minimizing delays. The following

functions are located at the ATCSCC:

a. Central Altitude Reservation Function
(CARF). Responsible for coordinating, planning,
and approving special user requirements under the

Altitude Reservation (ALTRV) concept.

(See ALTITUDE RESERVATION.)

b. Airport Reservation Office (ARO).
Responsible for approving IFR flights at designated
high density traffic airports (John F. Kennedy,
LaGuardia, and Ronald Reagan Washington

National) during specified hours.
(Refer to 14 CFR Part 93.)
(See CHART SUPPLEMENT U.S.)
c. U.S. Notice to Airmen (NOTAM) Office.
Responsible for collecting, maintaining, and distrib-
uting NOTAMs for the U.S. civilian and military, as
well as international aviation communities.
(See NOTICE TO AIRMEN.)
d. Weather Unit. Monitor all aspects of weather
for the U.S. that might affect aviation including cloud

cover, visibility, winds, precipitation, thunderstorms,
icing, turbulence, and more. Provide forecasts based
on observations and on discussions with meteorolo-
gists from various National Weather Service offices,
FAA facilities, airlines, and private weather services.
AIR TRAFFIC SERVICE- A generic term meaning:
a. Flight Information Service.
b. Alerting Service.

c. Air Traffic Advisory Service.
d. Air Traffic Control Service:

1. Area Control Service,
2. Approach Control Service, or
3. Airport Control Service.

AIR TRAFFIC SERVICE (ATS) ROUTES - The
term "ATS Route" is a generic term that includes
"VOR Federal airways," "colored Federal airways,"

PCG A-5

Page 613 of the Aeronautical Information Manual (AIM.pdf)
AIM: Official Guide to Basic Flight Information and ATC Procedures

Index   612 -- Page 613 -- 614