PowerShell/data/abbr/aviation.csv

1	ABBR	MEANING
2	3P	Perceive, Process, Perform
3	5P	Plan, Plane, Pilot, Passengers, Programming
4	7500	Transponder code for Aircraft hijacking (ICAO)
5	7600	Transponder code for Radio failure (lost communications, ICAO)
6	7700	Transponder code for Emergency (ICAO)
7	A/A	Air to air TACAN function
8	A/C	Aircraft
9	A/D	Aerodrome
10	A/F	Autofeather
11	A/FD	Airport/Facility Directory
12	A/P	Autopilot
13	A/R	Altitude Rate
14	A-VDGS	Advanced Visual Docking Guidance System
15	A300	Airbus A300 twinjet
16	A310	Airbus A310 twinjet
17	A320	Airbus A320 family of twinjets
18	A330	Airbus A330 twinjet
19	A340	Airbus A340 quadjet
20	A350	Airbus A350 twinjet
21	A380	Airbus A380 quadjet
22	AAA	Airport Airspace Analysis
23	AAE	Above Aerodrome Elevation
24	AAF	Airway Facilities Service
25	AAF	Army Air Field
26	AAI	Arrival Aircraft Interval
27	AAI	Airports Authority of India
28	AAIB	Air Accidents Investigation Branch (UK)
29	AAIM	Aircraft Autonomous Integrity Monitoring
30	AAM	Advanced Air Mobility
31	AAMS	Aircraft Arrival Management System
32	AARTS	Army Aviation Radar Training System
33	AAO	Assumed Adverse Obstacle
34	AAS	Airport Advisory Service
35	AB	Air Base, Afterburner
36	ABI	Advanced Boundary Information
37	AC	Aircraft
38	ACAC	Arab Civil Aviation Conference
39	ACAM	Aircraft Continuing Airworthiness Monitoring
40	ACARS	Aircraft Communications Addressing and Reporting System
41	ACAS	Airborne Collision Avoidance System
42	ACC	Area Control Center
43	ACE	Airport airside Capacity Enhancement
44	ACI	Airports Council International
45	ACP	Accept
46	AD	Air Defence
47	ADAC	Abu Dhabi Airports
48	ADEP	Aerodrome of Departure
49	ADES	Aerodrome of Destination
50	ADF	Automatic Direction Finding
51	ADI	Automatic De-Ice and Inhibitor
52	ADIRS	Air Data and Inertial Reference System
53	ADIRU	Air Data Inertial Reference Unit
54	ADIZ	Air Defense Identification Zone
55	ADL	Aeronautical Data Link
56	ADLY	Arrival Delay
57	ADP	Aerodrome dé Paris (Charles de Gaulle)
58	ADP	Automated Data Processing
59	ADS	Automated Distribution System, Automatic Dependent Surveillance, Aircraft Docking System
60	ADS-B	Automatic Dependent Surveillance-Broadcast
61	AENA	Aeropuertos Españoles y Navegación Aérea
62	AEO	All Engines Operative
63	AERA	Automated En-Route Air Traffic Control
64	AEW	Airborne Early Warning
65	AF	Air Field
66	AFCS	Automatic Flight Control System
67	AFI	Air Force Instruction
68	AFIS	Aerodrome Flight Information Service
69	AFTN	Aeronautical Fixed Telecommunication Network
70	AFM	Aircraft Flight Manual
71	AGAS	Action Group for ATM Safety (EUROCONTROL)
72	AGL	Above Ground Level
73	AH	Acceleration Height
74	ahdg	alter heading
75	AICS	Aircraft Inventory and Charter System
76	AID	Airport Information Desk
77	AIDS	Aircraft Integrated Data System
78	AIG	Airbus Industries Group
79	AILS	Automatic Instrument Landing System
80	AIM	Aeronautical Information Manual
81	AIP	Aeronautical Information Publication
82	AIPA	Aeronautical Information Production Application
83	AIRAC	Aeronautical Information Regulation And Control
84	AIRMET	Airmen's Meteorological Information
85	AIRNAV	Airports and Navigation Aids Database System
86	AIRNET	Airport Network Simulation Model
87	AIRPAC	Advisor for the Intelligent Resolution of Predicted Aircraft
88	ALO	Aviation Logistics Organization
89	ALP	Airport Layout Plan
90	ALPA	Airlines Pilots Association
91	ALS	Approach Lighting System
92	ALSF	Approach Lighting System With Sequenced Flashing Lights
93	ALSF1	ALS with Sequenced Flashers I
94	ALSF2	ALS with Sequenced Flashers II
95	ALSIP	Approach Lighting System Improvement Plan
96	ALTRV	Altitude Reservation
97	AM	Airfield Management
98	AMAN	Arrival Manager
99	AMASS	Airport Movement Area Safety System
100	AMCC	Air Route Traffic Control Center Maintenance Control Center
101	AMIC	Area Manager in Charge
102	AMIS	Aircraft Management Information System
103	AMOC	Alternative Methods of Compliance
104	AMOS	Automated Meteorological Observation Station
105	AMP	ARINC Message Processor (OR) Airport Master Plan
106	AMS	Acquisition Management System
107	AMT	Aviation Maintenance Technician
108	AMVER	Automated Mutual Assistance Vessel Rescue System
109	ANA	Administration of Air Navigation
110	ANC	Alternate Network Connectivity
111	ANCA	Airport Noise and Capacity Act
112	ANG	Air National Guard
113	ANGB	Air National Guard Base
114	ANMS	Automated Network Monitoring System
115	ANSL	Air Navigation Solutions Ltd. (UK)
116	ANSP	Air Navigation Service Provider
117	AOA	Angle of Attack, Air Operations Area, Airport Operating Area
118	AOB	Airfield Operations Board
119	AOC	Airline Operational Control Center
120	AOCC	Atlantic Operations Control Center
121	AODR	Authorizing Official Designated Representative
122	AOM	Airplane Operating Manual
123	AOPA	Aircraft Owners and Pilots Association
124	AOR	Area of Responsibility
125	AP	Acquisition Plan
126	APB	Acquisition Program Baselines
127	APM	Approach Path Monitor
128	APP	Approach
129	APS	Airport Planning Standard
130	APTS	Automated Personnel Tracking System
131	APU	Auxiliary Power Unit
132	AQAFO	Aeronautical Quality Assurance Field Office
133	AR	Aerial Refueling
134	AR	Aspect Ratio
135	ARAC	Army Radar Approach Control (AAF)
136	ARFOR	Area Forecast
137	ARLNO	Airline Office
138	ARP	Airport Reference Point
139	ARTCC	Air Route Traffic Control Centre
140	ASB	Airspace Block
141	ASDA	Accelerate Stop Distance Available
142	ASDE	Airport Surface Detection Equipment
143	ASDE-X	Airport Surface Detection Equipment, model X
144	ASOS	Automated Surface Observation System
145	ASR	Airport Surveillance Radar
146	ASTERIX	All Purpose Structured Eurocontrol Surveillance Information Exchange
147	ATA	Actual Time of Arrival
148	ATC	Air Traffic Control
149	ATCALS	Air Traffic Control and Landing Systems
150	ATCO	Air Traffic Control Officer
151	ATIS	Automatic Terminal Information Service
152	ATM	Air Traffic Management, Air Traffic Manager
153	ATO	Air Traffic Organization
154	ATPL	Airline Transport Pilot License
155	AURO	Autorotation (by helicopters)
156	AWACS	Airborne Warning And Control System
157	BC	Back Course
158	BAF	Belgian Air Force
159	BASH	Bird/Wildlife Aircraft Strike Hazard
160	BDOC	Base Defense Operations Center
161	BIRTAM	NOTAM on Bird Activity
162	BIT	Build-In Test
163	BITE	Build-In Test Equipment
164	BRNAV	Basic Area Navigation
165	BWB	Blended Wing Body
166	BWC	Bird Watch Condition
167	C2	Command and Control
168	C3	Communication, Command and Control
169	C4I	Communication, Command, Control, Computers and Intelligence
170	CAAC	Civil Aviation Administration of China
171	CAAS	Civil Aviation Authorization of Singapore
172	CAL	Computer Assisted Learning
173	CAMACA	Common Agreed Methodology for Airport airside Capacity Assessment
174	CANAC	Computer Assisted National Air Traffic Control Centre (Belgium)
175	CANSO	Civil Air Navigation Services Organization
176	CARMA	CATC Radar Simulator Allahabad
177	CAS	Calibrated Airspeed
178	CASE	Controlled Airspace Synthetic Environment (Simulator of Alenia Marconi)
179	CAT	Category of Aircraft, Clear Air Turbulence
180	CATC	Civil Air Traffic Control
181	CAVOK	Clouds And Visibility OK
182	C/S	Callsign
183	CBT	Computer-based Training
184	CC	Commander
185	CCBC	Community College Baltimore County
186	CCIS	Closed Circuit Information System
187	CCTLR	Chief Controller
188	CDA	Continuous Descent Approach
189	CDI	Course Deviation Indicator
190	CDM	Collaborative Decision Making
191	CDTI	Cockpit Display of Traffic Information
192	CDU	Cockpit Display Unit
193	CEATS	Central European Air Traffic Services
194	CESC	Chief Executive Standing Conference
195	CFIT	Controlled Flight Into Terrain
196	CFMU	Central Flow Management Unit
197	CFR	Code of Federal Regulations
198	COG	Center of Gravity
199	CON	Control
200	CGD	Combined Graphic Display
201	CISM	Critical Incident Stress Management
202	CLC	Course Line Computer
203	CLNC	Clearance
204	CMA	Controlled Movement Area
205	CMIC	Civil/Military Interface Standing Committee
206	CNS	Communication, Navigation, Surveillance
207	CODA	Central Office for Delay Analysis
208	ConOps	Concept of Operations
209	COPS	Changeover Point(s)
210	CORA	Conflict Resolution Advisory
211	COTS	Commercial Of-The-Shelf
212	CPA	Closest Point of Approach
213	CPDLC	Controller Pilot Data Link Communication
214	CPI	Crash Position Indicator
215	CPL	Commercial Pilot License
216	CRC	Control and Reporting Centre
217	CRDA	Converging Runway Display Aid
218	CREDOS	Crosswind Reduced Separations for Departure Operations
219	CTA	Controlled Area, Controlled Time of Arrival
220	CTAF	Common Traffic Advisory Frequency
221	CTOT	Calculated Take-Off Time
222	CTR	Control Zone or Controlled Traffic Region
223	CV	Vice Commander
224	CVFR	Controlled Visual Flight Rule (flight)
225	CVSM	Conventional Vertical Separation Minimum
226	CW	Continous Wave
227	CW	Cold Weather
228	CWS	Collision Warning System
229	CWP	Controller Working Position
230	CWY	Clearway
231	DA	Density Altitude
232	DAS	DFS Aviation Services (DFS subcompany for services outside Germany)
233	DCIA	Dependent Converging Instrument Approach
234	DECIDE	Detect, Estimate, Choose, Identify, Do, and Evaluate
235	DEL	Delivery
236	DER	Departure End of Runway
237	DFS	Deutsche Flugsicherung (ATC in Germany)
238	DGAC	Direction Générale de l'Aviation Civile
239	DLA	Defense Logistics Agency
240	DP	Departure Procedure
241	DSNA	Direction des Services de la Navigation Aérienne
242	DTI	Direction Technique Innovation
243	DVA	Diverse Vector Area
244	DW	Downwind
245	EAS	Equivalent Airspeed
246	EAVA	Estonian Aviation Academy
247	ECAC	European Civil Aviation Conference
248	eCTOL	Electric Conventional Take-off and Landing
249	ECP	Entry Control Point
250	EFM	Gesellschaft für Enteisen und Flugzeugschleppen
251	EICAS	Engine Instrument Crew Alerting System
252	ELEV	Field Elevation
253	ELT	Emergency Locator Transmitter
254	EOL	Engine-off landing
255	ERPM	Engine Rotations per Minute
256	eSTOL	Electric Short Take-off and Landing
257	ETA	Estimated Time of Arrival, East Transition Area
258	ETL	Effective Translational Lift (for helicopters)
259	ETOPS	Extended-range Twin-engine Operational Performance Standards
260	ETVS	Electronic Terminal Voice Switch
261	eVTOL	Electric Vertical Take-off and Landing
262	FAA	U.S. Federal Aviation Administration
263	FAR	Fuel Air Ratio, Federal Aviation Regulations
264	FAS	Final Approach Segment
265	FAS	Final Approach Speed
266	FAST	Future Aviation Safety Team
267	FAT	Factory Acceptance Test (see also SAT and RAT)
268	FAT	Final Approach Track
269	FATO	Final Approach and Take-off Area
270	FAWP	Final Approach Waypoint
271	FAWS	Flight Advisory Weather Service
272	FBO	Fixed-Base Operator
273	FBW	Fly-by-Wire
274	FCA	Final Cruise Altitude
275	FCC	Federal Communications Commission (USA)
276	FCC	Flight Control Computer
277	FCI	Flight Command Indicator
278	FCL	Flight Crew Licensing
279	FCLP	Field Carrier Landing Practice
280	FCLT	Freeze Calculated Landing Time
281	FCLTP	Flight Crew Licensing and Training Panel (ICAO)
282	FCOM	Flight Crew Operating Manual
283	FCOM	Flight Crew Operations Manual
284	FCPC	Flight Control Primary Computer
285	FE	Field Elevation (highest point of an airport’s usable runways and is measured in height above mean sea level)
286	FIA	Flight Information Area
287	FIR	Flight Information Region
288	FIS	Federal Inspection Services
289	FL	Flight Level
290	FLIP	Flight Information Publication
291	FMG	Flughafen München GmbH
292	FMS	Flight Management System
293	FOD	Foreign Object Debris
294	FOV	Field of View
295	FWC	Flight Warning Computer
296	GA	General Aviation, Go Around (VFR)
297	GND	Ground
298	GP	Glide Path
299	GPS	Global Positioning System
300	GS	Ground Speed or Glideslope
301	HEMS	Helicopter Emergency Medical Services
302	HKIA	Hong Kong International Airport
303	HOGE	Hover Out of Ground Effect
304	HOTS	Higher-Order Thinking Skills
305	IAA	Israeli Airport Authority
306	IAF	Israeli Air Force
307	IAS	Indicated airspeed
308	IATA	International Air Transport Association, HQ in Montreal, Canada
309	ICA	Initial Climb Area
310	IFE	In-flight Emergency
311	IFR	Instrument Flight Rules
312	IG	Image Generator
313	IGE	In Ground Effect
314	IGLR	Integrated Ground Lighting and Radar
315	ILS	Instrument Landing System
316	ISA	International Standard Atmosphere
317	IMC	Instrument Meteorological Conditions
318	KAT	Kaufbeuren ATM Training (DFS subcompany)
319	KCAS	Calibrated AirSpeed in Knots
320	KIAS	Indicated Airspeed in Knots
321	KTAS	True AirSpeed in Knots
322	LAA	Lappland Aviation Academy
323	LDA	Landing Distance Available
324	LDAH	Landing Distance Available for Helicopter
325	LH	Lufthansa
326	LITAS	Low Intensity Two Colour Approach System
327	LL	Lower Limit
328	LMUK	Lockheed Martin UK
329	LOD	Level of Detail
330	LTA	Lower Traffic Area
331	LUAW	Line up and wait
332	LVNL	Luchtverkeersleiding Nederland (Air Traffic Control the Netherlands)
333	LVP	Low Visibility Procedures
334	LWINS	Lightweight Inertial Navigation System
335	MA	Missed Approach (IFR)
336	MATS	Malta Air Traffic Services
337	MEA	Minimum En-route Altitude
338	METAR	Meteorological Aerodrome Report
339	MCP	Maximum Continuous Power
340	MGTOW	Maximum Gross Take-off Weight
341	MLW	Maximum Landing Weight
342	MMR	Multi-Mode Receiver
343	MSA	Minimum Safe Altitude
344	MSL	Median Sea Level
345	MSTA	Minimum Safe Turning Altitude
346	MTOW	Maximum Take-Off Weight
347	NATCA	National Air Traffic Controllers Association
348	NATOPS	Naval Aviation Training and Operating Procedures Standardization
349	NATS	National Air Traffic Services (UK)
350	NAVAIDS	Navigational Aids
351	NCOIC	Non-Commissioned Officer in Charge
352	NIMA	National Imagery Mapping Agency
353	NLFS	Night Low Flying System
354	NM	Nautical Mile
355	NORDO	No Radio
356	NOTAM	Notice to Airmen or Notice to Air Missions
357	NUAIR	Northeast UAS Airspace Integration Research (a New York based nonprofit organization)
358	OCS	Obstacle Clearance Surfaces
359	OCTA	Outside Control Areas
360	OEI	One Engine Inoperative
361	ODP	Obstacle Departure Procedure
362	OGE	Out of Ground Effect
363	OFZ	Obstacle Free Zone
364	OJT	On the Job Training
365	OODA	Observation, Orientation, Decision, and Action
366	PA	Pressure Altitude
367	PAPI	Precision Approach Path Indicator
368	PAR	Precision Approach Radar
369	PCAS	Primary Crash Alarm System
370	PIC	Pilot in Command
371	PNF	Pilot Not Flying
372	POH	Pilot's Operating Handbook
373	PPL	Private Pilot's License
374	PMI	Preventative Maintenance Inspection
375	POFZ	Precision Obstacle Free Zone
376	PTAC	Position, Turn, Altitude, Clearance (also known as Approach Clearance)
377	PtF	Permit to Fly
378	QFE	the altimeter setting that will cause the altimeter to read the height above a specific aerodrome or ground level, and therefore read zero on landing
379	QNE	pressure altitude at the landing runway threshold
380	QNH	atmospheric pressure adjusted to mean sea level
381	RADAR	Radio Detection And Ranging
382	RADNET	Radar Network
383	RAIM	Receiver Autonomous Integrity Monitoring (GPS)
384	RAPCON	Radar Approach Control
385	RAT	Reliability Acceptance Test (see also FAT and SAT)
386	RAM	Royal Air Maroc
387	RAP	Recognised Air Picture
388	RASP	Recognised Air and Surveillance Picture
389	RB	Relative Bearing
390	RBI	Relative Bearing Indicator
391	RBAF	Royal Belgium Armed Forces
392	RCAF	Royal Canadian Air Force
393	RCC	Rescue Co-ordination Centre
394	RCL	Runway Centre Line Lighting
395	RCR	Runway Condition Reading
396	RCS	Radar Cross Section
397	RESA	Runway End Safety Area
398	RET	Rapid Exit Taxiways
399	RF	Radio Frequency
400	RFFS	Rescue and Fire Fighting Services
401	RFM	Rotorcraft Flight Manual
402	RIMCAS	Runway Incursion Monitoring and Conflict Alert System
403	RJAF	Royal Jordanian Air Force
404	RJC	Reject
405	RPI	Runway Point of Intercept
406	ROFZ	Runway Obstacle Free Zone
407	RMI	Radio Magnetic Indicator
408	RNAV	Area Navigation
409	RNP	Required Navigation Performance
410	ROC	Rate Of Climb
411	ROC	Required Obstacle Clearance
412	RPS	Radar Position Symbol
413	RRPM	Rotor Rotations per Minute
414	RSA	Runway Safety Area
415	RSAF	Republic of Singapore Air Force
416	RSC	Runway Surface Condition
417	RSI	Remote Status Indicato
418	RSRS	Reduced Same Runway Separation
419	RTCA	Radio Technical Commission for Aeronautics
420	RVR	Runway Visual Range
421	RVSM	Reduced Vertical Separation Minimum
422	RWR	Radar Warning Receiver
423	RWY	Runway
424	SADL	Situational Awareness Data Link
425	SAF	Sustainable Aviation Fuel
426	SAR	Search and Rescue, Synthetic Aperture Radar
427	SARPS	Standards and Recommended Practices (ICAO)
428	SAT	Site Acceptance Test (see also FAT and RAT)
429	SATCO	Senior Air Traffic Control Officer
430	SATCOM	Satellite Communication
431	SATNAV	Satellite Navigation
432	SATSE	State Air Traffic Services Enterprise
433	SCN	Secondary Crash Net
434	SDD	Situation Data Display
435	SEOL	Simulated engine-off landing
436	SELCAL	Selective Calling System
437	SES	Single European Sky
438	SESAME	Single European Sky ATM Master Plan
439	SESAR	Single European Sky ATM Research
440	SFL	Sequencing Flashing Light
441	SFO	Simulated Flameout Operation
442	SI	Selective Interrogation
443	SIAP	Standard Instrument Approach Procedure
444	SID	Standard Instrument Departure
445	SIF	Selective Identification Friend or Foe
446	SIGMET	Significant Meteorological (Information) Report
447	SILs	Sector Inbound Lists
448	SIM	Simulator
449	SKYGUIDE	Air Traffic Control of Switzerland
450	SL	Sea Level
451	SLB	Side lobe Blanking
452	SLC	Side lobe Cancellation
453	SLOC	Slovenia Control
454	SM	Statute Mile
455	SMR	Surface Movement Radar
456	SOF	Supervisor of Flying
457	SOW	Statement of Work
458	SRC	Safety Regulation Commission (EUROCONTROL)
459	SRU	Safety Regulation Unit (EUROCONTROL)
460	SSR	Secondary Surveillance Radar
461	STAR	Standard Arrival Route or Standard Terminal Arrival Route
462	STARS	Standard Terminal Automation Replacement System
463	STB	Stop Bar
464	STCA	Short Term Conflict Alert
465	STD	Synthetic Training Device
466	STDMA	Self-organising Time Division Multiple Access (known as VHF digital link - Mode 4)
467	STNA	Service Technique de la Navigation Aerienne
468	STO	Short Take-Off
469	STOVL	Short Take-Off and Vertical Landing
470	STOL	Short Take-Off and Landing
471	STRATFOR	Eurocontrol Statistics and Forecasts Service
472	SUA	Special Use Airspace
473	SV	Supervisor
474	SVFR	Special Visual Flight Rules
475	SWT	Switch
476	SWY	Stopway
477	SYSCO	System Coordination – Data Exchange and Coordination
478	TA	Terminal Airspace
479	TAA	Terminal Arrival Area
480	TAAM	Total Airspace and Airport Modeller
481	TACAN	Tactical Air Navigation (System)
482	TACS	Theater Air Control System
483	TACTICOS	Tactical Information and Command System
484	TAF	Terminal Aerodrome/Area Forecast
485	TAIS	Tactical Airspace Integration System (US Army)
486	TAIS	Tactical Air Intelligence System
487	TAP	Target Acquisition Protocol
488	TARMAC	Taxi and Ramp Management and Control
489	TAS	Terminal Airspace System
490	TAS	True Air Speed
491	TAWS	Terrain Avoidance and Warning System
492	TCAS	Traffic alert and Collision Avoidance System
493	TCDS	Type Certificate Data Sheet
494	TCH	Threshold Crossing Height
495	TCL	Thrust Control Lever or Taxi Center Lights
496	TDW	Tower Display Workstation
497	TDZ	Runway Touchdown Zone Lighting
498	TDZE	Touch Down Zone Elevation
499	TERPS	US Standard for Terminal Instrument Procedures
500	TFDM	Terminal Flight Data Management
501	TFDPS	Tower Flight Data Processing System
502	TFM	Traffic Flow Management
503	TFR	Temporary Flight Restriction
504	TH	True Heading
505	TID	Touch Input Device
506	TIS	Traffic Information System
507	TLOF	Touchdown and Lift-off Area
508	TM	Traffic Management
509	TMA	Terminal Control Area
510	TOC	Top Of Climb
511	TOD	Top Of Descent
512	TODA	Take-off Distance Available
513	TODAH	Take-off Distance Available for Helicopter
514	TOP	Take-Off Power
515	TOR	Terms of Reference, or Tornado aircraft
516	TORA	Takeoff Run Available
517	TOWSIM	Tower Simulator
518	TRACON	Terminal Radar Approach Control
519	TRH	Thrust Reduction Height
520	TSO	Technical Standard Order
521	TSTC	Texas State Technical College
522	TT	True Track
523	TVOR	Terminal VOR
524	TWEB	Transcribed Weather Broadcast (USA for ATIS)
525	TWR	Control Tower or Thrust to Weight Ratio
526	TWY	Taxiway
527	TXC	Taxiway Centreline Lights
528	TXE	Taxiway Edge Lights
529	UA	Unmanned Aircraft
530	UAC	Upper Area Control Centre
531	UAM	Urban Air Mobility
532	UAS	Unmanned Aircraft Systems
533	UAT	Universal Access Transceiver
534	UAV	Unmanned Aerial Vehicle
535	UCAV	Unmanned Combat Aerial Vehicle
536	UDF	Ultra High Frequency Direction Finding
537	UEI	Units, Equipment, Installations
538	UFA	UFA, Inc., the world's premier developer of Air Traffic Control simulation systems
539	UHF	Ultra High Frequency (300MHz to 3 GHz)
540	UIR	Upper Flight Information Region
541	UKCAA	United Kingdom Civil Aviation Authority
542	UMASS	University of Massachusetts
543	URET	User Request Evaluation Tool
544	USAF	United States Air Force
545	UTA	Upper Traffic Area
546	V2	Takeoff speed. The speed at which the aircraft may safely be climbed with one engine inoperative
547	VAR	Magnetic Variation
548	VASI	Visual Approach Slope Indicator
549	VASIS	Visual Approach Slope Indicator System
550	VCS	Voice Communication System
551	VCCS	Voice Communication Control System
552	VCOA	Visual Climb Over Airport
553	VDF	Very High Frequency Direction Finding
554	VDGS	Visual Database Generation System
555	VDL-4	VHF digital link Mode 4 (see also STDMA)
556	VDU	Visual Display Unit
557	VFS	Vertical Flight Society
558	VFOW	Vertical Field of View
559	VFR	Visual Flight Rules
560	VHF	Very High Frequency (3 to 300MHz)
561	VLF	Very Low Frequency
562	VMC	Visual Meteorological Conditions
563	VOLMET	Meteorological Information for Aircraft in Flight
564	VOR	VHF Omni-directional Receiver
565	VORTAC	VOR -TACAN combination
566	VREF	1.3 times the stalling speed of the aircraft in the stated landing configuration and at the prevailing aircraft weight
567	VRS	Vortex Ring State
568	VS	Stall speed, defined as the minimum steady flight speed at which the airplane is controllable
569	VSBY	Visibility
570	VSP	Vertical Speed
571	VSTOL	Vertical Short Take-Off and Landing
572	VTC	Visual Terminal Chart
573	VTC	Virtual Training Centre
574	VTOL	Vertical Take-Off and Landing
575	VTOSL	Vertical Take-Off and Short Landing
576	VTS	Vehicle Tracking System
577	Vtoss	Take-off safety speed
578	Vy	Optimimum climbing speed
579	Vz	Rate-of-climb
580	WA	Wind Angle
581	WAAS	Wide Area Augmentation System
582	WAM	Wide Area Multilateration
583	WBS	Work Break-down Structure
584	WCA	Wind Correction Angle
585	WDI	Wind Direction Indicator
586	WGS	World Geodetic System
587	WIAS	Wetter Informations- und Anzeigesystem (German)
588	WP	Waypoint
589	WS	Work Station
590	WTC	Wake Turbulence Category
591	WTWS	Wake Turbulence Warning System
592	WX	Weather
593	WXR	Weather Radar Transceiver