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Aviation Acronyms & Abbreviations

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A

A
Autotuned NAVAID

At or Above (constrained altitude)
A/C
Aircraft
A/P
Autopilot
A/T
Autothrottle
AA
American Airlines
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
AC
Air Canada
ACARS
Aircraft Communications Addressing and Reporting System / 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
AD
Aerodrome
ADC
Aerodrome Chart

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
AI
Artificial Intelligence
AIRS
Advanced Infrared Sounder
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

Alternate
ALT HOLD
Altitude Hold Mode
ALTN
Alternate
AM
Amplitude Modulation
AMSL
Above Mean Sea Level
AMSS
Aeronautical Mobile Satellite Service
AOA
Angle-of-Attack

Airport Operations Area
AOC
Aerodrome Obstacle Chart

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
APA
Allied Pilots Association
APC
Aeronautical Passenger Communication
A class of communication which supports passenger communication
APDC
Aircraft Parking and Docking Chart
APMS
Automated Performance Measurement System
APPR
Approach/Approach Mode
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)
ATA
Air Transport Association

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)
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

B

B
At or Below (constrained altitude)
BALPA
British Air Line Pilots Association
BASIS
British Airways Safety Information System
BIT(E)
Built-ln-Test (Equipment)
BRG
Bearing
BRT
Brightness

C

C
Centigrade
CAA
Civil Aviation Authority (Great Britain)
CAAC
Civil Aviation Authority of China
CAB
Civil Aeronautics Board
CAS
Calibrated (Computed) Air Speed
CASE
Computer Aided Software Engineering
CAT
Clear Air Turbulence

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.
CAVOK
Ceiling And Visibility OK
CBT
Computer Based Training
CDI
Course Deviation Indicator
CDTI
Cockpit Display of Traffic Information
CDU
Control display unit (pilots' interface to the FMS)
CFIT
Controlled Flight Into Terrain
CG
Center of Gravity
CGS
Centimeter-gram-second
CI
Cost Index
CIT
Compressor Inlet Temperature
CLB
Climb Detent of the Thrust Levers
CLR
Clear
CMC
Central Maintenance Computer
CNS
Communications Navigations and Surveillance
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
CRM
Cockpit Resource Management

Crew Research Management
CRS
Course
CRT
Cathode Ray Tube
CRZ
Cruise
CSD
Constant Speed Drive
CTA
Controlled-Time of Arrival

Control Area (ICAO Term)
CTAS
Center TRACON Automation System
CTC
Centralized Train Central
CTR
Center

Civil Tilt Rotor
CTRL
Control
CWS
Control Wheel Steering

D

D
Derated
D-TO NI
Derated Takeoff Engine Fan Speed
D/D
Drift Down
DA
Decision Altitude

Descent Advisor
DADC
Digital Air Data Computer
DATALINK
Digitized Information Transfer (air/ground)
DBS
Direct Broadcast Satellite
DC
Direct Current Electricity
DCT
Direct (from one waypoint to another)
DE-TO PR
Derated Takeoff Engine Pressure Ratio
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
DGPS
Differential GPS
DH
Decision Height
DIR
Direct
DIR/INTC
Direct Intercept
DIS
Distance
DISCR
Discrepancy
DIST
Distance
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
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
DOD
Department of Defense
DOT
Department of Transportation
DRU
Data Retrival Unit
DSPY
Display (annunciation on CDU)
DTG
Distance-to-go

E

E
East
E/D
End-of-Descent
E/O
Engine-Out
EADI
Electronic Attitude Director Indicator
EAS
Equivalent Airspeed
ECAM
Electronic Centralized Aircraft Monitor
ECON
Economy (minimum cost speed schedule)
ECS
Environmental Control System
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
EPR
Engine Pressure Ratio
EPROM
Erasable Programmable Read-Only Memory
EST
Estimated
ETA
Estimated Time of Arrival
ETD
Estimated Time of Departure
ETE
Estimated Time Enroute
ETX
End of Transmission
EXEC
Execute

F

F
Fahrenheit
FA
Final Approach
FAA
Federal Aviation Administration
FADEC
Full Authority Digital Engine Control
FAF
Final Approach Fix
FAIL
FMC Fail
Failure
The inability of a system, subsytem, unit or part to perform within previously specified limits.
FANS
Future Air Navigation Systems
FAR
Federal Aviation Regulations (federal rules under which flight operations are conducted)

Federal Acquisition Regulation
FAST
Final Approach Spacing Tool
FBO
Fixed Based Operator
FCC
Flight Control Computer
FCU
Flight Control Unit
FD (F/D)
Flight Director
FDAMS
Flight Data Acquisition and Management System
FDC
Flight Data Company
FDR
Flight Data Recorder
FEATS
Future European Air Traffic System
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 autopilot 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

Focal Plane Array
FPM
Feet Per Minute
FQIS
Fuel Quantity Indicating System
FR
From
FRA
Flap Retraction Altitude
FREQ
Frequency
FSF
Flight Safety Foundation
FT
Feet

G

G/S
Glideslope
GA
General Aviation

Go-Around
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
GMC
Ground Movement Chart
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
Ground Speed

Glide Slope
GSFC
Goddard Space Flight Center
GW
Gross Weight

H

H
Height (over ground)
HAI
Helicopter Association International
HBARO
Barometric Altitude
HDG
Heading
HDG SEL
Heading Select
HDOT
Inertial Vertical Speed
HE
Altitude Error
HF
High Frequency
Hg
Inches of mercury
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
hPa
Hectopascals
HPRES
Pressure Altitude
HS
Hazardous locations on taxiways and/or runways where incidents have occurred
HSI
Horizontal Situation Indicator
HUD
Head-Up Display

I

IA
Inspection Authorization
IAF
Initial Approach Fix
IAOA
Indicated Angle-of-Attack
IAP
Instrument Approach Procedure
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 Fix

Intermediate Frequency
IFR
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
in.hg.
inches of mercury
INBD
Inbound
INFO
Information
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

J

JAL
Japan Air Lines
JAR
Joint Airworthiness Regulations
JATO
Jet Assisted Takeoff
JL
Japan Air Lines
JSRA
Joint Sponsored Research Agreement

K

KG
Kilogram
kHz
kilohertz
KLM
Royal Dutch Airlines
km
Kilometer
KT (kts)
Knots
kW
Kilowatt

L

L
Left
LAT
Latitude
LAX
Identifier for Los Angeles
LCN
Local Communications Network.
LDGPS
Local DGPS
LFR
Low-frequency Radio Range
LIFR
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 autopilot 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
LT
Left Turn
Often used in SIDs
LVL CHG
Level Change

M

M
Mach Number

Manual Tuned NAVAID
M/ASI
Mach/Airspeed Indicator
MAA
Maximum Authorized IFR Altitude
MAG
Magnetic
MAINT
Maintenance
MAN
Manual
MAP
Missed Approach
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 autopilot system; usually located centrally just below cockpit glare shield)
MCT
Maximum Continuous Thrust
MCW
Modulated Continuous Wave
MDA
Minimum Descent Altitude
MDL
Multipurpose Data Link
MEA
Minimum Enroute Altitude
MEF
Maximum Elevation Figure
MEL
Minimum Equipment List
METAR
Meteorological Aviation Report / Meteorological Terminal Aviation Routine Weather Report
MILSPEC
Military Specifications
MIN
Minutes

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
MSA
Minimum Sector Altitude

Minimum Safe Altitude (not an ICAO term)
MSG
Message
MSL
Mean Sea Level
MTBF
Mean Time Between Failures
MU
Management Unit
MVFR
MWP
Meteorological Weather Processor

N

N
North
N/A
Not Applicable
N1
Engine Revolutions per Minute (percent)
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

National Aircraft Standard
NASA
National Aeronautics and Space Administration
NATCA
National Air Traffic Controllers Association
NAV
Navigation
NAVAID
Navigational Aid
NBAA
National Business Aircraft Association
ND
Navigation Display
NDB
Nondirectional Radio Beacon
NESDIS
National Environmental Satellite, Data, and Information Service
NGATM
New Generation Air Traffic Manager
NLM
Network Loadable Module
NLR
National Research Laboratory (The Netherlands)
NM
Nautical Mile
NMC
National Meteorological Center
NOAA
National Oceanic and Atmospheric Administration
NoPT
No Procedure Turn
NOSIG
No significant change expected
NOTAM
Notice for Airman
NRP
National Route Program
NTSB
National Transportation Safety Board
NW
Northwest Airlines
NWS
National Weather Service

O

O-QAR
Optical Quick Access Recorder
OAG
Official Airline Guide
OAT
Outside AirTemperature
OATS
Orbit and Attitude Tracking
OBTEX
Offboard Targeting Experiments
OCA
Obstacle Clearance Altitude
OCH
Obstacle Clearance Height
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
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

P

P
Procedure-Required Tuned NAVAID
PAPI
Precision Approach Path Indicator
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

Q

QAR
Quick Access Recorder
QRH
The barometric pressure as reported by a particular station
QTY
Quantity
QUAD
Quadrant

R

R
Right

Route Tuned NAVAID
R/C
Rate of Climb
RAD
Radial

Radio
RAPS
Recovery Access Presentation System
RASCAL
Rotorcraft Air Crew Systems Concepts Airborne Laboratory
RCP
Radio Control Panel
RDP
Radar Data Processing (system)
REF
Reference
REQ
Required/Requirement

Request
RESTR
Restriction
RESYNCING
Resynchronizing
rf
radio frequency
RMK
Remarks
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
RT
Right Turn
Often used in SIDs
RTA
Required Time of Arrival
RTCA
Radio Technical Committee on Aeronautics
RTE
Route
RVR
Runway Visual Range
RW
Runway
RWY
Runway

S

S
South
S/C
Step Climb
SA
Situation Awareness
SAS
Scandinavian Airlines System
SAT
Static Air Temperature
SATCOM
Satellite Communications
SBIR
Small Business Innovative Research
SEA/TAC
Seattle/Tacoma International Airport
SEL
Selected
SESMA
Special Event Search and Master Analysis
SFC
Surface
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
SUA
Special Use Airspace
SWAP
Severe Weather Avoidance Program

T

T/C (TOC)
Top-of-Climb
T/D (TOD)
Top-of-Descent
T/O (TO)
Takeoff
TAA
Terminal Arrival Altitude
TACAN
Tactical Air Navigation
TACH
Tachometer
TAF
Terminal Area Forecast
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
TCU
Towering cumulus
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.)
TEC
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
TOC
Top-of-Climb
TOD
Top-of-Descent
TO EPR
Takeoff Engine Pressure Ratio
TOGA
Takeoff/Go-Around
TO NI
Takeoff Engine Fan Speed
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

U

UA
United
UHF
Ultra-high Frequency
US
USAir
USAF
United States Air Force

V

V
Velocity
V/S
Vertical Speed
V/TRK
Vertical Track
V1
Critical Engine Failure Velocity (Takeoff Decision Speed)
V2
Takeoff Climb Velocity
Va
Design Maneuvering Speed
VA
Heading to an Altitude
VAR
Variation

Volt-amps Reactive

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
Vc
Design Cruising Speed
VCMAX
Active Maximum Control Speed
VCMIN
Active Minimum Control Speed
Vd
Design Diving Speed
VD
Heading to a DME distance
Vf
Design Flap Speed
Vfe
Maximum Flap Extended Speed
VFR
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
VI
Heading to a course intercept
VISSR
Visible Infrared Spin Scan Radiometer
Vle
Landing Gear Extended Placard Airspeed
Vlo
Maximum Landing Gear of Operating Speed
Vlof
Lift-off Speed
VM
Heading to a manual termination
VM(LO)
Minimum Maneuver Speed
VMAX
Basic Clean Aircraft Maximum CAS
Vmc
Minimum Control Speed with Critical Engine Out
VMC
Visual Meteorological Conditions
VMIN
Basic Clean Aircraft Minimum CAS
Vmin
Lowest Selectable Airspeed
VMO
Velocity Max Operating
VNAV
Vertical Navigation (provides computer description of aircraft's speed and altitude that can be tracked by autopilot 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
VRB
Variable
VREF
Reference Velocity
VS
Design Speed for Maximum Gust Intensity
VSCS
Voice Switching and Control System
VSI
Vertical Speed Indicator

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
VTR
Variable Takeoff Rating
VU
Utility Speed
VX
Speed for Best Angle of Climb
VY
Speed for Best Rate of Climb

W

W
West
W/MOD
With Modification of Vertical Profile
W/STEP
With Step Change in Altitude
WAAS
Wide Area Augmentation System
Waypoint
Position in space usually on aircraft's flight plan
WBC
Weight and Balance Computer
WINDMG
Wind Magnitude
WINDR
Wind Direction
WMSC
Weather Message Switching Center
WMSCR
Weather Message Switching Center Replacement
WO
World Airways
WPT
Way point
WT
Weight
WX
Weather
WXR
Weather Radar

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

Y

YD
Yaw Damper
YSAS
Yaw Stability Augmentation System

Z

Z
Zulu (GMTtime)
ZFW
Zero Fuel Weight
ZNY
New York Air Route Traffic Control Center
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