A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

Select the first letter of the word from the list above to jump to appropriate section of the glossary.

A

A
Autotuned NAVAID

A
At or Above (constrained altitude)

AA
American

AAATS
Australian Advanced Air Traffic Services

AAC
Aeronautical Administration Communication (a class of communication which supports administrative communication)

AAS
Advanced Automation System (the end systems for all FAA air traffic control, located at the ARTCCs)

AATT
Advanced Aviation Transportation Technology

ABM
Abeam

A/C
Aircraft

AC
Air Canada

ACARS
Aircraft Communications Addressing and Reporting System

ACARS
ARINC communications and address reporting system (digital communications system used primarily for aircraft-to-airline messages)

ACARS MU
ACARS Management Unit

ACAS
Airborne Collision and Avoidance System

ACF
Area Control Facility

ACFS
Advanced Concepts Flight Simulator (a generic "glass cockpit")

ACK
Acknowledge

ACMS
Aircraft Condition Monitoring System

ACT
Active

ADC
Air Data Computer

ADF
Automatic Direction Finder

ADI
Attitude Director lndicator

ADLP
Aircraft Data Link Processor (the Mode S subnetwork function onboard the aircraft that implements the OSI network layer protocols)

ADMA
Aviation Distributors and Manufactureres Association

ADS
Automatic Dependent Surveillance

AECB
Atomic Energy Control Board

AERA
Automated Enroute ATC

AFCS
Automatic Flight Control System

AFDS
Autopilot Flight Director System (also A/P F/D)

AFS
Automatic Flight System

AGATE
Advanced General Aviation Transport Experiments

AGL
Above Ground Level

AHRS
Attitude Heading Reference System

AIRS
Advanced Infrared Sounder

A/l
Anti-ice

AI
Artificial Intelligence

AL
Allegheny

Alert
Indicator (visual or auditory) which provides information to the flightcrew in a timely manner about an event requiring pilot awareness.

ALPA
Air Line Pilots Association

ALT
Altitude

ALT
Alternate

ALTN
Alternate

ALT HOLD
Altitude Hold Mode

AM
Amplitude Modulation

AM
Aeromexico

AMSS
Aeronautical Mobile Satellite Service

ANA
All Nippon Airways

AOA
Angle-of-Attack

AOA
Airport Operations Area

AOC
Aeronautical Operation Control (communications which support safety and regularity of flight that normally take place between aircraft and the operator)

AOCS
Attitude and Orbit Control System

AOM
Aircraft Operating Manual

AOPA
Aircraft Owners and Pilots Association

A/P
Autopilot

APA
Allied Pilots Association

APC
Aeronautical Passenger Communication (a class of communication which supports passenger communication)

APMS
Automated Performance Measurement System

APPR
Approach/Approach Mode

APR
April

APRT
Airport

APU
Auxiliary Power Unit

AQP
Advanced Qualification Program

ARAC
Aviation Rulemaking Advisory Committee

ARINC
Aeronautical Radio Incorporated

ARPA
Advanced Research Projects Agency

ARR
Arrival

ARTCC
Air Route Traffic Control Center

ARTS
Automated Radar Terminal System

ASCII
American Standard Code for Interface and Interchange

ASI
Air Speed Indicator

ASR
Airport Surveillance Radar

ASRS
Aviation Safety Reporting System (aviation incident reporting system run by NASA for FAA)

AT
At (an altitude)

A/T
Autothrottle

ATA
Air Transport Association

ATA
Actual Time of Arrival

ATC
Air Traffic Control (a generic term for a joint civil/military system for controlling traffic within a specific area)

ATCS
Advanced Train Control Systems

ATCSCC
Air Traffic Control System Command Center

ATHR
Autothrust System

ATIS
Automatic Terminal Information Service (recorded voice message that provides weather and airport services information)

ATM
Air Transportation Management

ATN
Aeronautical Telecommunications Network (the collection of ground subnetworks, air/ground subnetworks and airborne subnetworks interconnected by ATN routers that support computer-to-computer, internetwork communication and message transfer between host computers using the OSI ISO protocol architecture)

ATS
Automatic Throttle System

ATSC
Air Traffic Service Communications (Communications related to air traffic services. This includes ATC, aeronautical and meteorological information, position reporting and services related to safety and regularity of flight)

AUG
August

AV
Avianca

AVAIL
Available

AVHRR
Advanced Very High-Resolution Radiometer

AWACS
Airborne Warning And Control System

AWAS
Automated Weather Advisory Station

AWIPS
Advanced Weather Interactive Processing System

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B

 

B
At or Below (constrained altitude)

BALPA
British Air Line Pilots Association

BASIS
British Airways Safety Information System

BF
MarkAir

BIT(E)
Built-ln-Test (Equipment)

BRG
Bearing

BRT
Brightness

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C

 

C
Centigrade

CAA
Civil Aviation Authority (Great Britain)

CAB
Civil Aeronautics Board

CAAC
Civil Aviation Authority of China

CAS
Calibrated (Computed) Air Speed

CASE
Computer Aided Software Engineering

CAT
Clear Air Turbulence

CAT
Computer Aided Testing

CAT I
Facility providing operation down to 200 feet decision height and runway visual range not less than 2600 feet.

CAT II
Facility providing operation down to 100 feet decision height and runway visual range not less than 1200 feet.

CAT II a
Facility providing operation with no decision height limit to and along the surface of the runway with external visual reference during final phase of landing and with a runway visual range not less than 700 feet.

CBT
Computer Based Training

CDI
Course Deviation Indicator

CDU
Control display unit (pilots' interface to the FMS)

CDTI
Cockpit Display of Traffic Information

CENA
Centred' Études de la Navigation Aérienne (France)

CFIT
Controlled Flight Into Terrain

CG
Center of Gravity

CGS
Centimeter-gram-second

Cl
Cost Index

CI
China Airlines

CIT
Compressor Inlet Temperature

CLB
Climb Detent of the Thrust Levers

CLR
Clear

CMC
Central Maintenance Computer

CNS
Communications Navigations and Surveillance

CO
Continetnal

COM
Cockpit Operating Manual

CON
Continuous

CO ROUTE
Company Route (also CO RTE)

COTR
Contracting Officer's Technical Representative

COTS
Commercial Off The Shelf

CP
Control Panel

CPCS
Cabin Pressure Control System

CPDLC
Controller Pilot Datalink Communications

CPU
Central Processing Unit

CRC
Cyclic Redundancy Check

CRITTER
Civil Rotorcraft IFR Terminal-Area Technology Enhancement Research

CRM
Cockpit Resource Management

CRM
Crew Research Management

CRS
Course

CRT
Cathode Ray Tube

CRZ
Cruise

CSD
Constant Speed Drive

CTA
Controlled-Time of Arrival

CTA
Control Area (ICAO Term)

CTAS
Center TRACON Automation System

CTC
Centralized Train Central

CTR
Center

CTR
Civil Tilt Rotor

CTRL
Control

CVSRF
Crew-Vehicle Simulation Research Facility (NASA Ames)

CWS
Control Wheel Steering

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D

 

D
Derated

DA
Descent Advisor

DBS
Direct Broadcast Satellite

DE-TO PR
Derated Takeoff Engine Pressure Ratio

D-TO Nl
Derated Takeoff Engine Fan Speed

DADC
Digital Air Data Computer

DATALINK
Digitized Information Transfer (air/ground)

DC
Direct Current Electricity

D/D
Drift Down

DEC
December

DEC
Digital Equipment Corporation

DECR
Decrement

DEL
Delete

DEP
Departure

DES
Descent

DEST
Destination

DEV
Deviation

DFDAU
Digital Flight Data Acquisition Unit

DFDR
Digital Flight Data Recorder

DFGS/C
Digital Flight Guidance System/Computer

DFW
Dallas Fort Worth International Airport

DGPS
Differential GPS

DH
Decision Height

DIR
Direct

DIR/INTC
Direct Intercept

DIS
Distance

DISCR
Discrepancy

DIST
Distance

DL
Delta

DLP
Data Link Processor (the FAA's ground automation system that supports the Mode S subnetwork (GDLP), internetwork (ATN router) and non-ATC data link application processes)

DLR
German Aerospace Research Establishment

DME
Distance Measuring Equipment (ground navigational aid that can provide display of distance to selected ground navigational radio transmitter)

DMU
Data Management Unit

DNTKFX
DownTrack Fix

DOT
Department of Transportation

DOD
Department of Defense

DRU
Data Retrival Unit

DSPY
Display (annunciation on CDU)

DTG
Distance-to-go

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E

 

E
East

EADI
Electronic Attitude Director Indicator

EAS
Equivalent Airspeed

ECAM
Electronic Centralized Aircraft Monitor

ECON
Economy (minimum cost speed schedule)

ECS
Environmental Control System

E/D
End-of-Descent

EDF
Electricité de France

EEC
Electronic Engine Control

EFC
Expected Further Clearance

EFIS
Electronic Flight Instrument System

EGT
Exhaust Gas Temperature

EHSI
Electronic Horizontal Situation Indicator

EICAS
Engine Indicating Crew Alerting System

EIU
Electronic Interface Unit

ELT
Emergency Locator Transmitter

EMP
Electromagnetic Pulse

EMS
Emergency Medical Services

ENG
Engine

E/O
Engine-Out

EPR
Engine Pressure Ratio

EPROM
Erasable Programmable Read-Only Memory

EST
Estimated

ETA
EstimatedTime of Arrival

ETX
End of Transmission

EXEC
Execute

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F

 

F
Fahrenheit

FA
Final Approach

FAA
Federal Aviation Administration

FADEC
Full Authority Digital Engine Control

FAIL
FMC Fail

Failure
The inability of a system, subsytem, unit or part to perform within previously specified limits.

FAF
Final Approach Fix

FANS
Future Air Navigation Systems

FAR
Federal Aviation Regulations (federal rules under which flight operations are conducted)

FAR
Federal Acquisition Regulation

FAST
Final Approach Spacing Tool

FBO
Fixed Based Operator

FCC
Flight Control Computer

FCU
Flight Control Unit

F/D (FD)
Flight Director

FDAMS
Flight Data Acquisition and Management System

FDC
Flight Data Company

FDR
Flight Data Recorder

FEATS
Future European Air Traffic System

FEB
February

FF
Fuel Flow

FGS/C
Flight Guidance System/Computer

FIR
Flight Information Region

Fix
Position in space usually on aircraft's flight plan

FL
Flight Level

FL 310
For example, FL310 is an altitude 31,000 ft. above sea level; used for altitudes above 18,000 ft

FLCH
Flight Level Change

FLIDRAS
Flight Data Replay and Analysis System

FLT
Flight

FMA
Flight Mode Annunciator: display on or near the PFDs of the current modes of autoflight system

FMC
Flight Management Computer (also FMCS - FMC System)

FMGC
Flight Management Guidance Computer

FMGS
Flight Management Guidance System

FMS
Flight Management System

FO
First officer

FOQA
Flight Operations Quality Assurance

FPA
Flight Path Angle

FPA
Focal Plane Array

FPM
Feet Per Minute

FQIS
Fuel Quantity Indicating System

FR
From

FRA
Flap Retraction Altitude

FRA
Federal Railroad Administration

FREQ
Frequency

FSF
Flight Safety Foundation

FT
Feet

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G

 

GA
Go-Around

GA
General Aviation

GAR
Go-Around

GCA
Ground-controlled Approach

GDLP
Ground Data Link Processor (the Mode S subnetwork function within the ground system that implements the OSI network layer protocols)

GHz
Gigahertz

GMT
Greenwich MeanTime

GNSS
Global Navigation Satellite System

GPS
Global Positioning System

GPWS
Ground Proximity Warning System (warns of inadequate separation from ground and excessive sink rate close to ground)

GRAF
Ground Replay and Analysis Facility

GRP
Geographical Reference Points

GS
Glide Slope

GS
Ground Speed

G/S
Glideslope

GSFC
Goddard Space Flight Center

GW
Gross Weight

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H

 

HAC
Hughes Aircraft Co.

HAI
Helicopter Association International

HBARO
Barometric Altitude

HDG
Heading

HDG SEL
Heading Select

HDOT
Inertial Vertical Speed

HE
Altitude Error

HF
High Frequency

Hl
High

HIRS
High-Resolution Infrared Sounder

Host Computer
Facility located at the ARTCC which operates user application software, as well as certain peer network layer protocols required to communicate with adjacent ATN routers.

Host Processor
"End system" as defined by ISO that includes the OSI upper layer protocols (i.e., transport layer and above) and application processes

HP
Holding Pattern

HPRES
Pressure Altitude

HSI
Horizontal Situation Indicator

HUD
Head-Up Display

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I

 

IA
Inspection Authorization

IAOA
Indicated Angle-of-Attack

IAS
Indicated Airspeed

ICAAS
Integrated Control in Avionics for Air Superiority

ICAO
International Civil Aviation Organization

ID
Identifier

IDENT
Identification

IEPR
Integrated Engine Pressure Ratio

IF
Intermediate Frequency

IFR
Instrument Flight Rules

IFRB
International Frequency Registration Board

IGFET
Insulated Gate Field Effect Transistor

ILS
Instrument Landing System (uses precision localizer and glide-slope radio transmitters near a runway to provide landing approach guidance)

IMC
Instrument Meteorological Conditions

INBD
Inbound

INFO
Information

in.hg.
inches of mercury

INIT
Initialization

INR
Image Navigation and Registration

INS
Inertial Navigation System

INTC
Intercept

IPT
Integrated Product Team

IRS
Inertial Reference System

IRU
Inertial Reference Unit

ISA
International Standard Atmosphere

ISO
International Standards Organization

ITU
International Telecommunications Union

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J

 

JAL
Japan Air Lines

JAN
January

JAR
Joint Airworthiness Regulations

JATO
Jet Assisted Takeoff

JL
Japan Air Lines

JSRA
Joint Sponsored Research Agreement

JUL
July

JUN
June

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K

 

KG
Kilogram

kHz
kilohertz

KLM
Royal Dutch Airlines

km
Kilometer

KT (kts)
Knots

kW
Kilowatt

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L

 

L Left

LAT
Latitude

LAX
Identifier for Los Angeles

LCN
Local Communications Network.

LDGPS
Local DGPS

LFR
Low-frequency Radio Range

LIM
Limit

LMM
Compass locator at the middle marker

LNAV
Lateral Navigation (provides computer description of aircraft's planned lateral flight path that can be tracked by the autoflight system; lateral path can be shown on map display.)

LO
Low

LOC
Localizer Beam

LOE
Line Oriented Evaluation

LOFT
Line Oriented Flight Training

LOM
Compass Locator at the Outer Marker

LON
Longitude

LORAN
Long Range Navigation

LOS
Line-Oriented Simulation

LRC
Long Range Cruise

LRU
Line Replaceable Unit

LVL CHG
Level Change

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M

 

M
Mach Number

M
Manual Tuned NAVAID

MAA
Maximum Authorized IFR Altitude

MAG
Magnetic

MAINT
Maintenance

MAN
Manual

MAP
Missed Approach

MAR
March

M/ASI
Mach/Airspeed Indicator

MAX
Maximum

MAX CLB
Maximum engine thrust for two-engine climb

MAX CRZ
Maximum engine thrust for two-engine cruise

MCA
Minimum Crossing Altitude

MCDU
Multipurpose Control Display Unit

MCP
Mode Control Panel (pilots' interface to the autoflight system; usually located centrally just below cockpit glare shield)

MCT
Maximum Continuous Thrust

MCW
Modulated Continuous Wave

MDA
McDonnell-Douglas Aerospace

MDA
Minimum Descent Altitude

MDL
Multipurpose Data Link

MEA
Minimum Enroute Altitude

MEL
Minimum Equipment List

MIDAS
Man-Machine Integration Design and Analysis System (NASA Ames)

MIDAS
Multi-discipline Data Analysis System

MILSPEC
Military Specifications

MIN
Minutes

MIN
Minimum

MIT
Massachusetts Institute of Technology

MLA
ManeuverLimited Altitude

MLE
Landing Gear Extended Placard Mach Number

MLS
Microwave Landing System

MMO
Mach Max Operating

MN
Magnetic North

MOA
Memorandum of Agreement

MOCA
Minimum Obstruction Clearance Altitude

MOD
Modified/Modification

Mode S
Type of secondary surveillance radar (SSR) equipment which provides Mode A and Mode C interrogations, discrete address (Mode S) interrogations from the ground or air, and a data link capability

MODIS
Moderate-resolution Imaging Spectrometer

MRA
Minimum Reception Altitude

MSG
Message

MSL
Mean Sea Level

MTBF
Mean Time Between Failures

MU
Management Unit

MWP
Meteorological Weather Processor

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N

 

N
North

NACA
National Advisory Committee for Aeronautics

NADIN II
National Airspace Data Interchange Network II (the national digital message switching network for aeronautical data)

NAS
National Airspace System

NAS
National Aircraft Standard

NASA
National Aeronautics and Space Administration

N/A
Not Applicable

NATCA
National Air Traffic Controllers Association

NAV
Navigation

NAVAID
Navigational Aid

NBAA
National Business Aircraft Association

NGATM
New Generation Air Traffic Manager

ND
Navigation Display

NDB
Nondirectional Radio Beacon

NESDIS
National Environmental Satellite, Data, and Information Service

NLM
Network Loadable Module

NLR
National Research Laboratory (The Netherlands)

NM
Nautical Mile

NMC
National Meteorological Center

NOAA
National Oceanic and Atmospheric Administration

NOTAM
Notice for Airman

NOV
November

NRP
National Route Program

NTSB
National Transportation Safety Board

NW
Northwest Airlines

NWS
National Weather Service

Nl
Engine Revolutions per Minute (percent)

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O

 

OAG
Official Airline Guide

OAT
Outside AirTemperature

OATS
Orbit and Attitude Tracking

OBTEX
Offboard Targeting Experiments

OCT
October

ODAPS
Operational OGE Data Acquisition and Patch Subsystem

OFST
Lateral Offset Active Light

OGE
Operational Ground Equipment

OIS
OGE Input Simulator

OO
SkyWest Airlines

OP
Operational

OPT
Optimum

O-QAR
Optical Quick Access Recorder

OSI
Open Sytem Interconnection (ISO defined communications architecture used in data link to permit heterogeneous data communication systems to be interconnected in order to allow the reliable exchange of messages without regard to the implementation of the networks and physical media through which the messages pass)

OTFP
Operational Traffic Flow Planning

OV
Overseas National Airways

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P

 

P
Procedure-Required Tuned NAVAID

PA
Pan Am

PAR
Precision Approach Radar

PAWES
Performance Assessment and Workload Evaluation

PBD
Place Bearing/Distance (way point)

PD
Profile Descent

PDB
Performance Data Base

PDC
Pre Departure Clearance

PERF
Performance

PF
Pilot Flying

PFD
Primary Flight Display

PHARE
Program for Harmonized ATC Research in Europe

PHIBUF
Performance Buffet Limit

PHINOM
Nominal Bank Angle

PIREPS
Pilot Reports

PMS
Performance Management System

PND
Primary Navigation Display

PNF
Pilot Not Flying

POS
Position

POS INIT
Position Initialization

POS REF
Position Reference

PPI
Plan Position Indicator

PPOS
Present Position

PREV
Previous

PROC
Procedure

PROF
Profile

PROG
Progress Page on MCDU

PROV
Provisional

PS
Pacific Southwest Airways

PT
Total Pressure

PTH
Path

PVD
Plan View Display

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Q

 

QAR
Quick Access Recorder

QRH
The barometric pressure as reported by a particular station

QTY
Quantity

QUAD
Quadrant

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R

 

R
Right

R
Route Tuned NAVAID

RAD
Radial

RAD
Radio

RAPS
Recovery Access Presentation System

RASCAL
Rotorcraft Air Crew Systems Concepts Airborne Laboratory

RCP
Radio Control Panel

R/C
Rate of Climb

RDP
Radar Data Processing (system)

REF
Reference

REQ
Required/Requirement

REQ
Request

RESTR
Restriction

RESYNCING
Resynchronizing

rf
radio frequency

RMPs
Radio Management Panels

RNAV
Area Navigation (generic acronym for any device capable of aircraft guidance between pilot-defined waypoints

RNP
Required Navigation Performance

Router
An ATN network layer gateway which performs the relaying and routing of data packets across interconnecting subnetworks based on the source and destination network layer addresses and the desired quality of network service

RTA
Required Time of Arrival

RTCA
Radio Technical Committee on Aeronautics

RTE
Route

RVR
Runway Visual Range

RW
Runway

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S

 

S
South

SA
Situation Awareness

SAS
Scandinavian Airlines System

SAT
Static Air Temperature

SATCOM
Satellite Communications

SBIR
Small Business Innovative Research

S/C
Step Climb

SEA/TAC
Seattle/Tacoma International Airport

SEL
Selected

SEP
September

SESMA
Special Event Search and Master Analysis

SID
Standard Instrument Departure

SIGMET
Significant Meteorological Information

SITA
Société Internationale Télécommunique Aéronautique

SO
Southern Airways

SOP
Standard Operating Procedure

SOPA
Standard Operating Procedure Amplified

SP
Space

SPD
Speed Mode

SPS
Sensor Processing Subsystem

SQL
Structured Query Language

SRP
Selected Reference Point

SSFDR
Solid-State Flight Data Recorder

SSM
Sign Status Matrix

STAB
Stabilizer

STAR
StandardTerminal Arrival Route

STEPCLB
StepClimb

STOL
Short Takeoff and Landing

STTR
Small Business Technology Transfer Resources

SUA
Special Use Airspace

SWAP
Severe Weather Avoidance Program

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T

 

TACAN
Tactical Air Navigation

TACH
Tachometer

TAI
Thermal Anti-lce

TAP
Terminal Area Productivity

TAS
True Airspeed

TAT
Total AirTemperature

TATCA
Terminal Air Traffic Control Automaiton

TBD
To Be Determined

TBO
Time between Overhauls

TBS
To Be Specified

TCA
Terminal Control Area

TCAS
Traffic Alert & Collision Avoidance System

T/C (TOC)
Top-of-Climb

T/D (TOD)
Top of-Descent

TDWR
Terminal Doppler Weather Radar (TDWR located and classifies windshear conditions and provides advisories in the terminal area. These data are available through the DLP.)

TEMP
Temperature

TFM
Traffic Flow Management

TGT
Target

THDG
True Heading

THR
Thrust

THR HOLD
Throttle Hold

TI
Texas International

TIAS
True Indicated Airspeed

TKE
TrackAngle Error

TMA
Traffic Management Advisor

TMC
Thrust Management Computer

TMF
Thrust Management Function

TMU
Traffic Management Unit

TN
True North

T/O (TO)
Takeoff

TOD
Top of Descent

TO EPR
Takeoff Engine Pressure Ratio

TO Nl
Takeoff Engine Fan Speed

TOGA
Takeoff/Go-Around

TOT
Total

TRA
Thrust Reduction Altitude

TRACON
Terminal Radar Approach Control Facility.

TRANS
Transition

TRK
Track (to a NAVAID)

TRU
True

TSRV
Transport Systems Research Facility

TT
Total Temperature

TURB
Turbulence

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U

 

UA
United

UHF
Ultra-high Frequency

US
USAir

USAF
United States Air Force

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V

 

V
Velocity

VA
Heading to an Altitude

VA
Design Maneuvering Speed

VAR
Variation

VAR
Volt-amps Reactive

VAR
Visual-aural Radio Range

VASI
Visual Approach Slope Indicator

VBF(LO)
Flaps up minimum buffet speed at current maneuver load factor minus altitude dependent variable

VBFNG(HI)
High speed CAS at N g's to buffet onset

VBFNG(LO)
Low speed CAS at N g's to buffet onset

VCMAX
Active Maximum Control Speed

VCMIN
Active Minimum Control Speed

VC
Design Cruising Speed

VD
Design Diving Speed

VD
Heading to a DME distance

VF
Design Flap Speed

VFE
Flaps Extended Placard Speed

VFR
Visual Flight Rules

VFXR(R)
Flap Retraction Speed

VFXR(X)
Flap Extension Speed

VG
Ground Velocity

VGND
Ground Velocity

VH
Maximum Level-flight Speed with Continuous Power

VHF
Very-high Frequency

VHRR
Very High-Resolution Radiometer

VISSR
Visible Infrared Spin Scan Radiometer

Vl
Heading to a course intercept

Vls
Lowest Selectable Airspeed

VLE
Landing Gear Extended Placard Airspeed

VLO
Maximum Landing Gear of Operating Speed

VLOF
Lift-off Speed

VM
Heading to a manual termination

VMC
Visual Meteorological Conditions

VMC
Minimum Control Speed with Critical Engine Out

VM(LO)
Minimum Maneuver Speed

VMAX
Basic Clean Aircraft Maximum CAS

VMIN
Basic Clean Aircraft Minimum CAS

VMO
Velocity Max Operating

VNAV
Vertical Navigation (provides computer description of aircraft's speed and altitude that can be tracked by autoflight system)

VNE
Never-exceed Speed

VNO
Maximum Structural Cruising Speed

VOM
Volt-ohm-milliammeter

VOR
VHF OmniRange Navigatgion System (ground navigational aid that can provide display of aircraft position relative to course through selected ground navigational radio transmitter)

VORTAC
VHF Omni Range Radio/Tactical Air Navagation

VPATH
Vertical Path

VR
Heading to a radial

VR
Takeoff Rotation Velocity

VREF
Reference Velocity

VS
Design Speed for Maximum Gust Intensity

V/S
Vertical Speed/Vertical

VSCS
Voice Switching and Control System

VSI
Stalling Speed in a Specified Flight Configuration

VSO
Stalling Speed in the Landing Configuration

VSTOL
Vertical or Short Takeoff and Landing

VTK
Vertical Track Distance

VTOL
Vertical Takeoff and Landing

V/TRK
Vertical Track

VTR
Variable Takeoff Rating

VU
Utility Speed

VX
Speed for Best Angle of Climb

VY
Speed for Best Rate of Climb

Vl
Critical Engine Failure Velocity (Takeoff Decision Speed)

V2
Takeoff Climb Velocity

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W

 

W
West

WAAS
Wide Area Augmentation System

Waypoint
Position in space usually on aircraft's flight plan

WBC
Weight and Balance Computer

WINDR
Wind Direction

WINDMG
Wind Magnitude

WPT
Way point

W/MOD
With Modification of Vertical Profile

WMSC
Weather Message Switching Center

WMSCR
Weather Message Switching Center Replacement

WO
World Airways

W/STEP
With Step Change in Altitude

WT
Weight

WX
Weather

WXR
Weather Radar

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X

X-BAND
The frequency range between 8000 and 12500 MHz

XCVR Transceiver

XFR
Transfer

XLTR
Translater

XM
External Master

XMIT
Transmit

XMITR
Transmitter

XPD
ATC Transponder (also XPDR, XPNDR, TPR)

XTK
Crosstrack (cross track error)

XY
Ryan Air

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Y

YSAS
Yaw Stability Augmentation System

 

YD
Yaw Damper

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Z

 

Z
Zulu (GMTtime)

ZFW
Zero Fuel Weight

ZNY
New York Air Route Traffic Control Center

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