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