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(See ICAO term AREA CONTROL CENTER.)
ACCELERATE-STOP DISTANCE AVAILABLE−
The runway plus stopway length declared available
and suitable for the acceleration and deceleration of
an airplane aborting a takeoff.
ACCELERATE-STOP DISTANCE AVAILABLE
[ICAO]− The length of the take-off run available plus
the length of the stopway if provided.
ACDO−
(See AIR CARRIER DISTRICT OFFICE.)
ACKNOWLEDGE− Let me know that you have
received my message.
(See ICAO term ACKNOWLEDGE.)
ACKNOWLEDGE [ICAO]− Let me know that you
have received and understood this message.
ACL−
(See AIRCRAFT LIST.)
ACLS−
(See AUTOMATIC CARRIER LANDING
SYSTEM.)
ACLT−
(See ACTUAL CALCULATED LANDING TIME.)
ACROBATIC FLIGHT− An intentional maneuver
involving an abrupt change in an aircraft’s attitude, an
abnormal attitude, or abnormal acceleration not
necessary for normal flight.
(See ICAO term ACROBATIC FLIGHT.)
(Refer to 14 CFR Part 91.)
ACROBATIC FLIGHT [ICAO]− Maneuvers intentionally
performed by an aircraft involving an abrupt
change in its attitude, an abnormal attitude, or an
abnormal variation in speed.
ACTIVE RUNWAY−
(See RUNWAY IN USE/ACTIVE RUNWAY/DUTY
RUNWAY.)
ACTUAL CALCULATED LANDING TIME−
ACLT is a flight’s frozen calculated landing time. An
actual time determined at freeze calculated landing
time (FCLT) or meter list display interval (MLDI) for
the adapted vertex for each arrival aircraft based upon
runway configuration, airport acceptance rate, airport
arrival delay period, and other metered arrival
aircraft. This time is either the vertex time of arrival
(VTA) of the aircraft or the tentative calculated
landing time (TCLT)/ACLT of the previous aircraft
plus the arrival aircraft interval (AAI), whichever is
later. This time will not be updated in response to the
aircraft’s progress.
ACTUAL NAVIGATION PERFORMANCE
(ANP)−
(See REQUIRED NAVIGATION
PERFORMANCE.)
ADS-B−
(See AUTOMATIC DEPENDENT
SURVEILLANCE-BROADCAST.)
ADDITIONAL SERVICES− 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.
Pilot/Controller Glossary 2/17/05
PCG A−2
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−
(See AUTOMATIC DIRECTION FINDER.)
ADIZ−
(See AIR DEFENSE IDENTIFICATION ZONE.)
ADLY−
(See ARRIVAL DELAY.)
ADMINISTRATOR− The Federal Aviation Administrator
or any person to whom he/she has delegated
his/her authority in the matter concerned.
ADR−
(See AIRPORT DEPARTURE RATE.)
ADS [ICAO]−
(See ICAO term AUTOMATIC DEPENDENT
SURVEILLANCE.)
ADS−B−
(See AUTOMATIC DEPENDENT
SURVEILLANCE−BROADCAST.)
ADS−C−
(See AUTOMATIC DEPENDENT
SURVEILLANCE−CONTRACT.)
ADVISE INTENTIONS− Tell me what you plan to
do.
ADVISORY− Advice and information provided to
assist pilots in the safe conduct of flight and aircraft
movement.
(See ADVISORY SERVICE.)
ADVISORY FREQUENCY− The appropriate frequency
to be used for Airport Advisory Service.
(See LOCAL AIRPORT ADVISORY.)
(See UNICOM.)
(Refer to ADVISORY CIRCULAR NO. 90-42.)
(Refer to AIM.)
ADVISORY SERVICE− Advice and information
provided by a facility to assist pilots in the safe
　
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