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A
|
| A |
At or Above (constrained altitude)
|
| A/C |
|
| A/P |
|
| A/T |
|
| AA |
|
| 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 |
|
| AC |
|
| 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 |
|
| ACAS |
Airborne Collision and Avoidance System
|
| ACF |
|
| ACFS |
Advanced Concepts Flight Simulator (a generic "glass cockpit")
|
| ACK |
|
| ACMS |
Aircraft Condition Monitoring System
|
| ACT |
|
| AD |
|
| ADC |
|
| 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 |
|
| AFCS |
Automatic Flight Control System
|
| AFDS |
Autopilot Flight Director System (also A/P F/D)
|
| AFS |
|
| AGATE |
Advanced General Aviation Transport Experiments
|
| AGL |
|
| AHRS |
Attitude Heading Reference System
|
| AI |
|
| 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 |
|
| ALT HOLD |
|
| ALTN |
|
| AM |
|
| AMSL |
|
| AMSS |
Aeronautical Mobile Satellite Service
|
| AOA |
|
| 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
|
| 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 |
|
| APRT |
|
| APU |
|
| AQP |
Advanced Qualification Program
|
| ARAC |
Aviation Rulemaking Advisory Committee
|
| ARINC |
Aeronautical Radio Incorporated
|
| ARPA |
Advanced Research Projects Agency
|
| ARR |
|
| ARTCC |
Air Route Traffic Control Center
|
| ARTS |
Automated Radar Terminal System
|
| ASCII |
American Standard Code for Interface and Interchange
|
| ASI |
|
| ASR |
Airport Surveillance Radar
|
| ASRS |
Aviation Safety Reporting System (aviation incident reporting system run by NASA for FAA)
|
| AT |
|
| ATA |
Air Transport Association
|
| 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 |
|
| 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 |
|
| 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 |
|
| BRT |
|
C
|
| C |
|
| CAA |
Civil Aviation Authority (Great Britain)
|
| CAAC |
Civil Aviation Authority of China
|
| CAB |
|
| CAS |
Calibrated (Computed) Air Speed
|
| CASE |
Computer Aided Software Engineering
|
| CAT |
|
| 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 |
|
| CDA |
Continuous Descent Approach (aka Optimized Profile Descent, OPD)
|
| 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 |
|
| CGS |
|
| CI |
|
| CIT |
Compressor Inlet Temperature
|
| CLB |
Climb Detent of the Thrust Levers
|
| CLR |
|
| CMC |
Central Maintenance Computer
|
| CNS |
Communications Navigations and Surveillance
|
| COM |
|
| CON |
|
| CO ROUTE |
Company Route (also CO RTE)
|
| COTR |
Contracting Officer's Technical Representative
|
| COTS |
|
| CP |
|
| CPCS |
Cabin Pressure Control System
|
| CPDLC |
Controller Pilot Datalink Communications
|
| CPU |
|
| CRC |
|
| CRM |
Cockpit Resource Management
|
| CRS |
|
| CRT |
|
| CRZ |
|
| CSD |
|
| CTA |
Controlled-Time of Arrival
|
| CTAS |
Center TRACON Automation System
|
| CTC |
Centralized Train Central
|
| CTOT |
Calculated Take Off Time (AKA Slot Time)
|
| CTR |
|
| CTRL |
|
| CWS |
|
D
|
| D |
|
| D-TO NI |
Derated Takeoff Engine Fan Speed
|
| D/D |
|
| DA |
|
| 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 |
|
| DEL |
|
| DEP |
|
| DES |
|
| DEST |
|
| DEV |
|
| DFDAU |
Digital Flight Data Acquisition Unit
|
| DFDR |
Digital Flight Data Recorder
|
| DFGS/C |
Digital Flight Guidance System/Computer
|
| DGPS |
|
| DH |
|
| DIR |
|
| DIR/INTC |
|
| DIS |
|
| DISCR |
|
| DIST |
|
| 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 |
|
| DNTKFX |
|
| DOD |
|
| DOT |
Department of Transportation
|
| DRU |
|
| DSPY |
Display (annunciation on CDU)
|
| DTG |
|
E
|
| E |
|
| E/D |
|
| E/O |
|
| EADI |
Electronic Attitude Director Indicator
|
| EAS |
|
| ECAM |
Electronic Centralized Aircraft Monitor
|
| ECON |
Economy (minimum cost speed schedule)
|
| ECS |
Environmental Control System
|
| EDF |
|
| EEC |
Electronic Engine Control
|
| EET |
|
| EFC |
Expected Further Clearance
|
| EFIS |
Electronic Flight Instrument System
|
| EGT |
|
| EHSI |
Electronic Horizontal Situation Indicator
|
| EICAS |
Engine Indicating Crew Alerting System
|
| EIU |
Electronic Interface Unit
|
| ELT |
Emergency Locator Transmitter
|
| EMP |
|
| EMS |
Emergency Medical Services
|
| ENG |
|
| EPR |
|
| EPROM |
Erasable Programmable Read-Only Memory
|
| EST |
|
| ETA |
Estimated Time of Arrival
|
| ETD |
Estimated Time of Departure
|
| ETE |
|
| ETO |
Estimated Time Over [...waypoint]
|
| ETX |
|
| EXEC |
|
F
|
| F |
|
| FA |
|
| FAA |
Federal Aviation Administration
|
| FADEC |
Full Authority Digital Engine Control
|
| FAF |
|
| 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 |
|
| FCC |
|
| FCU |
|
| FD (F/D) |
|
| FDAMS |
Flight Data Acquisition and Management System
|
| FDC |
|
| FDR |
|
| FEATS |
Future European Air Traffic System
|
| FF |
|
| FGS/C |
Flight Guidance System/Computer
|
| FIR |
Flight Information Region
|
| Fix |
Position in space usually on aircraft's flight plan
|
| FL |
|
| FL 310 |
For example, FL310 is an altitude 31,000 ft. above sea level; used for altitudes above 18,000 ft
|
| FLCH |
|
| FLIDRAS |
Flight Data Replay and Analysis System
|
| FLT |
|
| 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 |
|
| FO |
|
| FOP |
|
| FOQA |
Flight Operations Quality Assurance
|
| FPA |
|
| FPM |
|
| FQIS |
Fuel Quantity Indicating System
|
| FR |
|
| FRA |
|
| FREQ |
|
| FSF |
|
| FT |
|
G
|
| G/S |
|
| GA |
|
| GAR |
|
| 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 |
|
| GMC |
|
| GMT |
|
| 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 |
|
| GSFC |
Goddard Space Flight Center
|
| GW |
|
H
|
| H |
|
| HAI |
Helicopter Association International
|
| HBARO |
|
| HDG |
|
| HDG SEL |
|
| HDOT |
|
| HE |
|
| HF |
|
| Hg |
|
| 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 |
|
| hPa |
|
| HPRES |
|
| HS |
Hazardous locations on taxiways and/or runways where incidents have occurred
|
| HSI |
Horizontal Situation Indicator
|
| HUD |
|
I
|
| IA |
|
| IAF |
|
| IAOA |
Indicated Angle-of-Attack
|
| IAP |
Instrument Approach Procedure
|
| IAS |
|
| ICAAS |
Integrated Control in Avionics for Air Superiority
|
| ICAO |
International Civil Aviation Organization
|
| ID |
|
| IDENT |
|
| IEPR |
Integrated Engine Pressure Ratio
|
| IF |
|
| 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
|
| IMT |
|
| in.hg. |
|
| INBD |
|
| INFO |
|
| INIT |
|
| INR |
Image Navigation and Registration
|
| INS |
Inertial Navigation System
|
| INTC |
|
| IPT |
|
| IRS |
Inertial Reference System
|
| IRU |
|
| ISA |
International Standard Atmosphere
|
| ISO |
International Standards Organization
|
| ITT |
|
| ITU |
International Telecommunications Union
|
J
|
| JAL |
|
| JAR |
Joint Airworthiness Regulations
|
| JATO |
|
| JL |
|
| JSRA |
Joint Sponsored Research Agreement
|
K
|
| KG |
|
| kHz |
|
| KLM |
|
| km |
|
| KT (kts) |
|
| kW |
|
L
|
| L |
|
| LAT |
|
| LAX |
Identifier for Los Angeles
|
| LCN |
Local Communications Network.
|
| LDGPS |
|
| LFR |
Low-frequency Radio Range
|
| LIFR |
|
| LIM |
|
| 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 |
|
| LOC |
|
| LOE |
|
| LOFT |
Line Oriented Flight Training
|
| LOM |
Compass Locator at the Outer Marker
|
| LON |
|
| LORAN |
|
| LOS |
|
| LRC |
|
| LRU |
|
| LT |
Left Turn
Often used in SIDs
|
| LVL CHG |
|
M
|
| M |
|
| M/ASI |
|
| MAA |
Maximum Authorized IFR Altitude
|
| MAG |
|
| MAINT |
|
| MAN |
|
| MAP |
|
| MAX |
|
| 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 |
|
| MDL |
|
| MEA |
|
| MEF |
|
| MEL |
|
| METAR |
Meteorological Aviation Report / Meteorological Terminal Aviation Routine Weather Report
|
| MHA |
|
| MILSPEC |
|
| MIN |
|
| MIT |
Massachusetts Institute of Technology
|
| MLA |
|
| MLE |
Landing Gear Extended Placard Mach Number
|
| MLS |
|
| MMO |
|
| MN |
|
| MOA |
|
| MOCA |
Minimum Obstruction Clearance Altitude
|
| MOD |
|
| 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
|
| MORA |
Minimum off route altitude
|
| MRA |
Minimum Reception Altitude
|
| MSA |
Minimum Safe Altitude (not an ICAO term)
|
| MSG |
|
| MSL |
|
| MTBF |
Mean Time Between Failures
|
| MU |
|
| MVFR |
|
| MWP |
Meteorological Weather Processor
|
N
|
| N |
|
| N/A |
|
| 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 Aircraft Standard
|
| NASA |
National Aeronautics and Space Administration
|
| NAT-OTS |
North Atlantic Organised Track System
|
| NATCA |
National Air Traffic Controllers Association
|
| NAV |
|
| NAVAID |
|
| NBAA |
National Business Aircraft Association
|
| ND |
|
| NDB |
Nondirectional Radio Beacon
|
| NESDIS |
National Environmental Satellite, Data, and Information Service
|
| NGATM |
New Generation Air Traffic Manager
|
| NLM |
|
| NLR |
National Research Laboratory (The Netherlands)
|
| NM |
|
| NMC |
National Meteorological Center
|
| NOAA |
National Oceanic and Atmospheric Administration
|
| NoPT |
|
| NOSIG |
No significant change expected
|
| NOTAM |
|
| NRP |
|
| NTSB |
National Transportation Safety Board
|
| NW |
|
| NWS |
|
O
|
| O-QAR |
Optical Quick Access Recorder
|
| OAG |
|
| OAT |
|
| OATS |
Orbit and Attitude Tracking
|
| OBS |
|
| 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 |
|
| OO |
|
| OP |
|
| OPT |
|
| 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 |
|
| PAWES |
Performance Assessment and Workload Evaluation
|
| PBD |
Place Bearing/Distance (way point)
|
| PD |
|
| PDB |
|
| PDC |
|
| PERF |
|
| PF |
|
| PFD |
|
| PHARE |
Program for Harmonized ATC Research in Europe
|
| PHIBUF |
|
| PHINOM |
|
| PIREPS |
|
| PMS |
Performance Management System
|
| PND |
Primary Navigation Display
|
| PNF |
|
| POS |
|
| POS INIT |
|
| POS REF |
|
| PPI |
|
| PPOS |
|
| PREV |
|
| PROC |
|
| PROF |
|
| PROG |
|
| PROV |
|
| PS |
Pacific Southwest Airways
|
| PT |
|
| PTH |
|
| PVD |
|
Q
|
| QAR |
|
| QDM |
|
| QDR |
Reciprocal Magnetic Bearing (opposite of QDM)
|
| QRH |
The barometric pressure as reported by a particular station
|
| QTY |
|
| QUAD |
|
R
|
| R |
|
| R/C |
|
| RAD |
|
| RAPS |
Recovery Access Presentation System
|
| RASCAL |
Rotorcraft Air Crew Systems Concepts Airborne Laboratory
|
| RCP |
|
| RDIS |
|
| RDP |
Radar Data Processing (system)
|
| REF |
|
| REQ |
|
| RESTR |
|
| RESYNCING |
|
| rf |
|
| RMK |
|
| RMPs |
|
| 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 |
|
| RTCA |
Radio Technical Committee on Aeronautics
|
| RTE |
|
| RVR |
|
| RW |
|
| RWY |
|
S
|
| S |
|
| S/C |
|
| SA |
|
| SAS |
Scandinavian Airlines System
|
| SAT |
|
| SATCOM |
|
| SBIR |
Small Business Innovative Research
|
| SEA/TAC |
Seattle/Tacoma International Airport
|
| SEL |
|
| SESMA |
Special Event Search and Master Analysis
|
| SFC |
|
| SID |
Standard Instrument Departure
|
| SIGMET |
Significant Meteorological Information
|
| SITA |
Société Internationale Télécommunique Aéronautique
|
| SO |
|
| SOP |
Standard Operating Procedure
|
| SOPA |
Standard Operating Procedure Amplified
|
| SP |
|
| SPD |
|
| SPS |
Sensor Processing Subsystem
|
| SQL |
Structured Query Language
|
| SRP |
|
| SSFDR |
Solid-State Flight Data Recorder
|
| SSM |
|
| STAB |
|
| STAR |
StandardTerminal Arrival Route
|
| STEPCLB |
|
| STOL |
Short Takeoff and Landing
|
| SUA |
|
| SWAP |
Severe Weather Avoidance Program
|
T
|
| T/C (TOC) |
|
| T/D (TOD) |
|
| T/O (TO) |
|
| TAA |
Terminal Arrival Altitude
|
| TACAN |
|
| TACH |
|
| TAF |
|
| TAI |
|
| TAP |
Terminal Area Productivity
|
| TAS |
|
| TAT |
|
| TATCA |
Terminal Air Traffic Control Automaiton
|
| TBD |
|
| TBO |
|
| TBS |
|
| TCA |
|
| TCAS |
Traffic Alert & Collision Avoidance System
|
| TCU |
|
| TDV |
|
| 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 |
|
| TFM |
|
| TGT |
|
| THDG |
|
| THR |
|
| THR HOLD |
|
| TI |
|
| TIAS |
|
| TKE |
|
| TMA |
Traffic Management Advisor
|
| TMC |
Thrust Management Computer
|
| TMF |
Thrust Management Function
|
| TMI |
Track Message Identification (in connection with the North Atlantic track system)
|
| TMU |
|
| TN |
|
| TOC |
|
| TOD |
|
| TO EPR |
Takeoff Engine Pressure Ratio
|
| TOGA |
|
| TO NI |
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| TORA |
Take off Run Available (see also https://aviationthrust.com/clearway-stopway-tora-toda-asda-ldadeclared-runway-distances/)
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| TOT |
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| TRA |
Thrust Reduction Altitude
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| TRACON |
Terminal Radar Approach Control Facility.
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| TRANS |
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| TRK |
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| TRP |
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| TRU |
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| TSRV |
Transport Systems Research Facility
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| TT |
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| TURB |
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U
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| UA |
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| UHF |
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| US |
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| USAF |
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V
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| V |
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| V/S |
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| V/TRK |
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| V1 |
Critical Engine Failure Velocity (Takeoff Decision Speed)
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| V2 |
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| Va |
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| VA |
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| VAR |
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| VASI |
Visual Approach Slope Indicator
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| VBF(LO) |
Flaps up minimum buffet speed at current maneuver load factor minus altitude dependent variable
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| VBFNG(HI) |
High speed CAS at N g's to buffet onset
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| VBFNG(LO) |
Low speed CAS at N g's to buffet onset
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| Vc |
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| VCMAX |
Active Maximum Control Speed
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| VCMIN |
Active Minimum Control Speed
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| Vd |
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| VD |
Heading to a DME distance
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| Vf |
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| Vfe |
Maximum Flap Extended Speed
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| VFR |
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| VFXR(R) |
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| VFXR(X) |
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| VG |
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| VGND |
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| VGSI |
Visual Glide Slope Indicator
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| Vh |
Maximum Level-flight Speed with Continuous Power
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| VHF |
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| VHRR |
Very High-Resolution Radiometer
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| VI |
Heading to a course intercept
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| VISSR |
Visible Infrared Spin Scan Radiometer
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| Vle |
Landing Gear Extended Placard Airspeed
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| Vlo |
Maximum Landing Gear of Operating Speed
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| Vlof |
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| VM |
Heading to a manual termination
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| VM(LO) |
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| VMAX |
Basic Clean Aircraft Maximum CAS
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| Vmc |
Minimum Control Speed with Critical Engine Out
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| VMC |
Visual Meteorological Conditions
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| VMIN |
Basic Clean Aircraft Minimum CAS
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| Vmin |
Lowest Selectable Airspeed
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| VMO |
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| VNAV |
Vertical Navigation (provides computer description of aircraft's speed and altitude that can be tracked by autopilot system)
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| VNE |
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| VNO |
Maximum Structural Cruising Speed
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| VOM |
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| VOR |
VHF OmniRange Navigatgion System (ground navigational aid that can provide display of aircraft position relative to course through selected ground navigational radio transmitter)
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| VORTAC |
VHF Omni Range Radio/Tactical Air Navagation
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| VPATH |
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| VR |
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| Vr |
Takeoff Rotation Velocity
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| VRB |
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| VREF |
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| VS |
Design Speed for Maximum Gust Intensity
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| VSCS |
Voice Switching and Control System
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| VSI |
Stalling Speed in a Specified Flight Configuration
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| VSO |
Stalling Speed in the Landing Configuration
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| VSTOL |
Vertical or Short Takeoff and Landing
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| VTK |
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| VTOL |
Vertical Takeoff and Landing
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| VTR |
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| VU |
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| VX |
Speed for Best Angle of Climb
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| VY |
Speed for Best Rate of Climb
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W
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| W |
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| W/MOD |
With Modification of Vertical Profile
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| W/STEP |
With Step Change in Altitude
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| WAAS |
Wide Area Augmentation System
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| Waypoint |
Position in space usually on aircraft's flight plan
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| WBC |
Weight and Balance Computer
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| WINDMG |
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| WINDR |
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| WMSC |
Weather Message Switching Center
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| WMSCR |
Weather Message Switching Center Replacement
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| WO |
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| WPT |
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| WT |
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| WX |
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| WXR |
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X
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| X-BAND |
The frequency range between 8000 and 12500 MHz
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| XCVR |
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| XFR |
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| XLTR |
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| XM |
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| XMIT |
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| XMITR |
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| XPD |
ATC Transponder (also XPDR, XPNDR, TPR)
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| XTK |
Crosstrack (cross track error)
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| XY |
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Y
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| YD |
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| YSAS |
Yaw Stability Augmentation System
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Z
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| Z |
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| ZFW |
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| ZNY |
New York Air Route Traffic Control Center
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