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	A300	Airbus A300 twinjet
15	A310	Airbus A310 twinjet
16	A320	Airbus A320 family of twinjets
17	A330	Airbus A330 twinjet
18	A340	Airbus A340 quadjet
19	A350	Airbus A350 twinjet
20	A380	Airbus A380 quadjet
21	AAA	Airport Airspace Analysis
22	AAE	Above Aerodrome Elevation
23	AAF	Airway Facilities Service
24	AAF	Army Air Field
25	AAI	Arrival Aircraft Interval
26	AAI	Airports Authority of India
27	AAIB	Air Accidents Investigation Branch (UK)
28	AAIM	Aircraft Autonomous Integrity Monitoring
29	AAM	Advanced Air Mobility
30	AAMS	Aircraft Arrival Management System
31	AARTS	Army Aviation Radar Training System
32	AAO	Assumed Adverse Obstacle
33	AAS	Airport Advisory Service
34	AB	Air Base, Afterburner
35	ABI	Advanced Boundary Information
36	AC	Aircraft
37	ACAC	Arab Civil Aviation Conference
38	ACAM	Aircraft Continuing Airworthiness Monitoring
39	ACARS	Aircraft Communications Addressing and Reporting System
40	ACAS	Airborne Collision Avoidance System
41	ACC	Area Control Center
42	ACE	Airport airside Capacity Enhancement
43	ACI	Airports Council International
44	ACP	Accept
45	AD	Air Defence
46	ADAC	Abu Dhabi Airports
47	ADEP	Aerodrome of Departure
48	ADES	Aerodrome of Destination
49	ADF	Automatic Direction Finding
50	ADI	Automatic De-Ice and Inhibitor
51	ADIRS	Air Data and Inertial Reference System
52	ADIRU	Air Data Inertial Reference Unit
53	ADIZ	Air Defense Identification Zone
54	ADL	Aeronautical Data Link
55	ADLY	Arrival Delay
56	ADP	Aerodrome dé Paris (Charles de Gaulle)
57	ADP	Automated Data Processing
58	ADS	Automated Distribution System
59	ADS	Automatic Dependent Surveillance
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	RPM	Rotations per Minute
407	ROFZ	Runway Obstacle Free Zone
408	RMI	Radio Magnetic Indicator
409	RNAV	Area Navigation
410	RNP	Required Navigation Performance
411	ROC	Rate Of Climb
412	ROC	Required Obstacle Clearance
413	RPM	Revolutions Per Minute
414	RPS	Radar Position Symbol
415	RRPM	Rotor Rotations per Minute
416	RSA	Runway Safety Area
417	RSAF	Republic of Singapore Air Force
418	RSC	Runway Surface Condition
419	RSI	Remote Status Indicato
420	RSRS	Reduced Same Runway Separation
421	RTCA	Radio Technical Commission for Aeronautics
422	RVR	Runway Visual Range
423	RVSM	Reduced Vertical Separation Minimum
424	RWR	Radar Warning Receiver
425	RWY	Runway
426	SADL	Situational Awareness Data Link
427	SAF	Sustainable Aviation Fuel
428	SAR	Search and Rescue, Synthetic Aperture Radar
429	SARPS	Standards and Recommended Practices (ICAO)
430	SAT	Site Acceptance Test (see also FAT and RAT)
431	SATCO	Senior Air Traffic Control Officer
432	SATCOM	Satellite Communication
433	SATNAV	Satellite Navigation
434	SATSE	State Air Traffic Services Enterprise
435	SCN	Secondary Crash Net
436	SDD	Situation Data Display
437	SEOL	Simulated engine-off landing
438	SELCAL	Selective Calling System
439	SES	Single European Sky
440	SESAME	Single European Sky ATM Master Plan
441	SESAR	Single European Sky ATM Research
442	SFL	Sequencing Flashing Light
443	SFO	Simulated Flameout Operation
444	SI	Selective Interrogation
445	SIAP	Standard Instrument Approach Procedure
446	SID	Standard Instrument Departure
447	SIF	Selective Identification Friend or Foe
448	SIGMET	Significant Meteorological (Information) Report
449	SILs	Sector Inbound Lists
450	SIM	Simulator
451	SKYGUIDE	Air Traffic Control of Switzerland
452	SL	Sea Level
453	SLB	Side lobe Blanking
454	SLC	Side lobe Cancellation
455	SLOC	Slovenia Control
456	SM	Statute Mile
457	SMR	Surface Movement Radar
458	SOF	Supervisor of Flying
459	SOW	Statement of Work
460	SRC	Safety Regulation Commission (EUROCONTROL)
461	SRU	Safety Regulation Unit (EUROCONTROL)
462	SSR	Secondary Surveillance Radar
463	STAR	Standard Arrival Route or Standard Terminal Arrival Route
464	STARS	Standard Terminal Automation Replacement System
465	STB	Stop Bar
466	STCA	Short Term Conflict Alert
467	STD	Synthetic Training Device
468	STDMA	Self-organising Time Division Multiple Access (known as VHF digital link - Mode 4)
469	STNA	Service Technique de la Navigation Aerienne
470	STO	Short Take-Off
471	STOVL	Short Take-Off and Vertical Landing
472	STOL	Short Take-Off and Landing
473	STRATFOR	Eurocontrol Statistics and Forecasts Service
474	SUA	Special Use Airspace
475	SV	Supervisor
476	SVFR	Special Visual Flight Rules
477	SWT	Switch
478	SWY	Stopway
479	SYSCO	System Coordination – Data Exchange and Coordination
480	TA	Terminal Airspace
481	TAA	Terminal Arrival Area
482	TAAM	Total Airspace and Airport Modeller
483	TACAN	Tactical Air Navigation (System)
484	TACS	Theater Air Control System
485	TACTICOS	Tactical Information and Command System
486	TAF	Terminal Aerodrome/Area Forecast
487	TAIS	Tactical Airspace Integration System (US Army)
488	TAIS	Tactical Air Intelligence System
489	TAP	Target Acquisition Protocol
490	TARMAC	Taxi and Ramp Management and Control
491	TAS	Terminal Airspace System
492	TAS	True Air Speed
493	TAWS	Terrain Avoidance and Warning System
494	TCAS	Traffic alert and Collision Avoidance System
495	TCDS	Type Certificate Data Sheet
496	TCH	Threshold Crossing Height
497	TCL	Thrust Control Lever or Taxi Center Lights
498	TDW	Tower Display Workstation
499	TDZ	Runway Touchdown Zone Lighting
500	TDZE	Touch Down Zone Elevation
501	TERPS	US Standard for Terminal Instrument Procedures
502	TFDM	Terminal Flight Data Management
503	TFDPS	Tower Flight Data Processing System
504	TFM	Traffic Flow Management
505	TFR	Temporary Flight Restriction
506	TH	True Heading
507	TID	Touch Input Device
508	TIS	Traffic Information System
509	TLOF	Touchdown and Lift-off Area
510	TM	Traffic Management
511	TMA	Terminal Control Area
512	TOC	Top Of Climb
513	TOD	Top Of Descent
514	TODA	Take-off Distance Available
515	TODAH	Take-off Distance Available for Helicopter
516	TOP	Take-Off Power
517	TOR	Terms of Reference, or Tornado aircraft
518	TORA	Takeoff Run Available
519	TOWSIM	Tower Simulator
520	TRACON	Terminal Radar Approach Control
521	TRH	Thrust Reduction Height
522	TSO	Technical Standard Order
523	TSTC	Texas State Technical College
524	TT	True Track
525	TVOR	Terminal VOR
526	TWEB	Transcribed Weather Broadcast (USA for ATIS)
527	TWR	Control Tower or Thrust to Weight Ratio
528	TWY	Taxiway
529	TXC	Taxiway Centreline Lights
530	TXE	Taxiway Edge Lights
531	UA	Unmanned Aircraft
532	UAC	Upper Area Control Centre
533	UAM	Urban Air Mobility
534	UAS	Unmanned Aircraft Systems
535	UAT	Universal Access Transceiver
536	UAV	Unmanned Aerial Vehicle
537	UCAV	Unmanned Combat Aerial Vehicle
538	UDF	Ultra High Frequency Direction Finding
539	UEI	Units, Equipment, Installations
540	UFA	UFA, Inc., the world's premier developer of Air Traffic Control simulation systems
541	UHF	Ultra High Frequency (300MHz to 3 GHz)
542	UIR	Upper Flight Information Region
543	UKCAA	United Kingdom Civil Aviation Authority
544	UMASS	University of Massachusetts
545	URET	User Request Evaluation Tool
546	USAF	United States Air Force
547	UTA	Upper Traffic Area
548	V2	Takeoff speed. The speed at which the aircraft may safely be climbed with one engine inoperative
549	VAR	Magnetic Variation
550	VASI	Visual Approach Slope Indicator
551	VASIS	Visual Approach Slope Indicator System
552	VCS	Voice Communication System
553	VCCS	Voice Communication Control System
554	VCOA	Visual Climb Over Airport
555	VDF	Very High Frequency Direction Finding
556	VDGS	Visual Database Generation System
557	VDL-4	VHF digital link Mode 4 (see also STDMA)
558	VDU	Visual Display Unit
559	VFS	Vertical Flight Society
560	VFOW	Vertical Field of View
561	VFR	Visual Flight Rules
562	VHF	Very High Frequency (3 to 300MHz)
563	VLF	Very Low Frequency
564	VMC	Visual Meteorological Conditions
565	VOLMET	Meteorological Information for Aircraft in Flight
566	VOR	VHF Omni-directional Receiver
567	VORTAC	VOR -TACAN combination
568	VREF	1.3 times the stalling speed of the aircraft in the stated landing configuration and at the prevailing aircraft weight
569	VRS	Vortex Ring State
570	VS	Stall speed, defined as the minimum steady flight speed at which the airplane is controllable
571	VSBY	Visibility
572	VSP	Vertical Speed
573	VSTOL	Vertical Short Take-Off and Landing
574	VTC	Visual Terminal Chart
575	VTC	Virtual Training Centre
576	VTOL	Vertical Take-Off and Landing
577	VTOSL	Vertical Take-Off and Short Landing
578	VTS	Vehicle Tracking System
579	Vtoss	Take-off safety speed
580	Vy	Optimimum climbing speed
581	Vz	Rate-of-climb
582	WA	Wind Angle
583	WAAS	Wide Area Augmentation System
584	WAM	Wide Area Multilateration
585	WBS	Work Break-down Structure
586	WCA	Wind Correction Angle
587	WDI	Wind Direction Indicator
588	WGS	World Geodetic System
589	WIAS	Wetter Informations- und Anzeigesystem (German)
590	WP	Waypoint
591	WS	Work Station
592	WTC	Wake Turbulence Category
593	WTWS	Wake Turbulence Warning System
594	WX	Weather
595	WXR	Weather Radar Transceiver