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VNAV . . . . . . Vertical Navigation
VNE . . . . . . . Never exceed speed
VNEI . . . . . . . Instrument flight never exceed speed,
utilized instead of VNE for compliance with
maximum limit speed requirements for
instrument flight
VOR . . . . . . . Very High Frequency Omni−directional
Range
VORTAC . . . VHF Omni−directional Range/Tactical Air
Navigation
VOT . . . . . . . VOR Test Facility
VR . . . . . . . . VFR Military Training Route
VREF . . . . . . . . . The reference landing approach speed,
usually about 1.3 times Vso plus 50 percent
of the wind gust speed in excess of the
mean wind speed.
VSO . . . . . . . . . . The stalling speed or the minimum steady
flight speed in the landing configuration at
maximum weight.
VTF . . . . . . . Vector to Final
VV . . . . . . . . Vertical Visibility
VY . . . . . . . . Speed for best rate of climb
VYI . . . . . . . . Instrument climb speed, utilized instead of
VY for compliance with the climb
requirements for instrument flight
WA . . . . . . . . AIRMET
WAAS . . . . . Wide Area Augmentation System
WAC . . . . . . . World Aeronautical Chart
WFO . . . . . . . Weather Forecast Office
WGS−84 . . . . World Geodetic System of 1984
WMO . . . . . . World Meteorological Organization
WMS . . . . . . Wide−Area Master Station
WMSC . . . . . Weather Message Switching Center
WMSCR . . . . Weather Message Switching Center
Replacement
WP . . . . . . . . Waypoint
WRS . . . . . . . Wide−Area Ground Reference Station
WS . . . . . . . . SIGMET
WSO . . . . . . Weather Service Office
WSP . . . . . . . Weather System Processor
WST . . . . . . . Convective Significant Meteorological
Information
WW . . . . . . . Severe Weather Watch Bulletin
2/17/05 Pilot/Controller Glossary
PCG−1
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 DEPENDENT SURVEILLANCE (ADS) [ICAO]
AUTOMATIC DEPENDENT SURVEILLANCE−CONTRACT (ADS−C)
MAN PORTABLE AIR DEFENSE SYSTEMS (MANPADS)
NAVIGATION REFERENCE SYSTEM (NRS)
b. Terms Modified:
CONTROLLED AIRSPACE
LOCAL AIRPORT ADVISORY (LAA)
REMOTE AIRPORT ADVISORY (RAA)
UNRELIABLE
c. Editorial/format changes were made where necessary. Revision bars were not used due to the insignificant
nature of the changes.

8/5/04 Pilot/Controller Glossary
PCG A−1
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]−
　
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