7/31/08 Pilot/Controller Glossary
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PILOT/CONTROLLER
GLOSSARY
PURPOSE
a. This Glossary was compiled to promote a common understanding of the terms used in the Air Traffic
Control system. It includes those terms which are intended for pilot/controller communications. Those terms
most frequently used in pilot/controller communications are printed in bold italics. The definitions are primarily
defined in an operational sense applicable to both users and operators of the National Airspace System. Use of
the Glossary will preclude any misunderstandings concerning the system's design, function, and purpose.
b. Because of the international nature of flying, terms used in the Lexicon, published by the International
Civil Aviation Organization (ICAO), are included when they differ from FAA definitions. These terms are
followed by “[ICAO].” For the reader's convenience, there are also cross references to related terms in other parts
of the Glossary and to other documents, such as the Code of Federal Regulations (CFR) and the Aeronautical
Information Manual (AIM).
c. This Glossary will be revised, as necessary, to maintain a common understanding of the system.
EXPLANATION OF CHANGES
a. Terms Added:
AUTOMATIC FLIGHT INFORMATION SERVICE (AFIS) - ALASKA FSS ONLY
b. Editorial/format changes were made where necessary. Revision bars were not used due to the insignificant
nature of the changes.

2/14/08 Pilot/Controller Glossary
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A
AAI-
(See ARRIVAL AIRCRAFT INTERVAL.)
AAR-
(See AIRPORT ARRIVAL RATE.)
ABBREVIATED IFR FLIGHT PLANS- An
authorization by ATC requiring pilots to submit only
that information needed for the purpose of ATC. It
includes only a small portion of the usual IFR flight
plan information. In certain instances, this may be
only aircraft identification, location, and pilot
request. Other information may be requested if
needed by ATC for separation/control purposes. It is
frequently used by aircraft which are airborne and
desire an instrument approach or by aircraft which are
on the ground and desire a climb to VFR‐on‐top.
(See VFR‐ON‐TOP.)
(Refer to AIM.)
ABEAM- An aircraft is “abeam” a fix, point, or
object when that fix, point, or object is approximately
90 degrees to the right or left of the aircraft track.
Abeam indicates a general position rather than a
precise point.
ABORT- To terminate a preplanned aircraft
maneuver; e.g., an aborted takeoff.
ACC [ICAO]-
(See ICAO term AREA CONTROL CENTER.)
ACCELERATE‐STOP DISTANCE AVAILABLEThe
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 TIMEACLT
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.)
ADDITIONAL SERVICES- Advisory information
provided by ATC which includes but is not limited to
the following:
　
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