PowerShell/data/dicts/aviation.csv

1	TERM	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	LAHSO	Land and Hold Short Operations
326	LDA	Landing Distance Available
327	LDAH	Landing Distance Available for Helicopter
328	LH	Lufthansa
329	LITAS	Low Intensity Two Colour Approach System
330	LL	Lower Limit
331	LMUK	Lockheed Martin UK
332	LOD	Level of Detail
333	LTA	Lower Traffic Area
334	LUAW	Line up and wait
335	LVNL	Luchtverkeersleiding Nederland (Air Traffic Control the Netherlands)
336	LVP	Low Visibility Procedures
337	LWINS	Lightweight Inertial Navigation System
338	MA	Missed Approach (IFR)
339	MATS	Malta Air Traffic Services
340	MEA	Minimum En-route Altitude
341	METAR	Meteorological Aerodrome Report
342	MCP	Maximum Continuous Power
343	MGTOW	Maximum Gross Take-off Weight
344	MLW	Maximum Landing Weight
345	MMR	Multi-Mode Receiver
346	MSA	Minimum Safe Altitude
347	MSL	Median Sea Level
348	MSTA	Minimum Safe Turning Altitude
349	MTOW	Maximum Take-Off Weight
350	NATCA	National Air Traffic Controllers Association
351	NATOPS	Naval Aviation Training and Operating Procedures Standardization
352	NATS	National Air Traffic Services (UK)
353	NAVAIDS	Navigational Aids
354	NCOIC	Non-Commissioned Officer in Charge
355	NIMA	National Imagery Mapping Agency
356	NLFS	Night Low Flying System
357	NM	Nautical Mile
358	NORDO	No Radio
359	NOTAM	Notice to Airmen or Notice to Air Missions
360	NUAIR	Northeast UAS Airspace Integration Research (a New York based nonprofit organization)
361	OCS	Obstacle Clearance Surfaces
362	OCTA	Outside Control Areas
363	OEI	One Engine Inoperative
364	ODP	Obstacle Departure Procedure
365	OGE	Out of Ground Effect
366	OFZ	Obstacle Free Zone
367	OJT	On the Job Training
368	OODA	Observation, Orientation, Decision, and Action
369	PA	Pressure Altitude
370	PADS	Parallax Aircraft Docking System
371	PAPA	Parallax Aircraft Parking Aid (docking system)
372	PAPI	Precision Approach Path Indicator
373	PAR	Precision Approach Radar
374	PCAS	Primary Crash Alarm System
375	PIC	Pilot in Command
376	PNF	Pilot Not Flying
377	POH	Pilot's Operating Handbook
378	PPL	Private Pilot's License
379	PMI	Preventative Maintenance Inspection
380	POFZ	Precision Obstacle Free Zone
381	PTAC	Position, Turn, Altitude, Clearance (also known as Approach Clearance)
382	PtF	Permit to Fly
383	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
384	QNE	pressure altitude at the landing runway threshold
385	QNH	atmospheric pressure adjusted to mean sea level
386	RADAR	Radio Detection And Ranging
387	RADNET	Radar Network
388	RAIM	Receiver Autonomous Integrity Monitoring (GPS)
389	RAPCON	Radar Approach Control
390	RAT	Reliability Acceptance Test (see also FAT and SAT)
391	RAM	Royal Air Maroc
392	RAP	Recognised Air Picture
393	RASP	Recognised Air and Surveillance Picture
394	RB	Relative Bearing
395	RBI	Relative Bearing Indicator
396	RBAF	Royal Belgium Armed Forces
397	RCAF	Royal Canadian Air Force
398	RCC	Rescue Co-ordination Centre
399	RCL	Runway Centre Line Lighting
400	RCR	Runway Condition Reading
401	RCS	Radar Cross Section
402	RESA	Runway End Safety Area
403	RET	Rapid Exit Taxiways
404	RF	Radio Frequency
405	RFFS	Rescue and Fire Fighting Services
406	RFM	Rotorcraft Flight Manual
407	RIMCAS	Runway Incursion Monitoring and Conflict Alert System
408	RJAF	Royal Jordanian Air Force
409	RJC	Reject
410	RPI	Runway Point of Intercept
411	ROFZ	Runway Obstacle Free Zone
412	RMI	Radio Magnetic Indicator
413	RNAV	Area Navigation
414	RNP	Required Navigation Performance
415	ROC	Rate Of Climb
416	ROC	Required Obstacle Clearance
417	RPS	Radar Position Symbol
418	RRPM	Rotor Rotations per Minute
419	RSA	Runway Safety Area
420	RSAF	Republic of Singapore Air Force
421	RSC	Runway Surface Condition
422	RSI	Remote Status Indicato
423	RSRS	Reduced Same Runway Separation
424	RTCA	Radio Technical Commission for Aeronautics
425	RVR	Runway Visual Range
426	RVSM	Reduced Vertical Separation Minimum
427	RWR	Radar Warning Receiver
428	RWY	Runway
429	SADL	Situational Awareness Data Link
430	SAF	Sustainable Aviation Fuel
431	SAR	Search and Rescue, Synthetic Aperture Radar
432	SARPS	Standards and Recommended Practices (ICAO)
433	SAT	Site Acceptance Test (see also FAT and RAT)
434	SATCO	Senior Air Traffic Control Officer
435	SATCOM	Satellite Communication
436	SATNAV	Satellite Navigation
437	SATSE	State Air Traffic Services Enterprise
438	SCN	Secondary Crash Net
439	SDD	Situation Data Display
440	SEOL	Simulated engine-off landing
441	SELCAL	Selective Calling System
442	SES	Single European Sky
443	SESAME	Single European Sky ATM Master Plan
444	SESAR	Single European Sky ATM Research
445	SFL	Sequencing Flashing Light
446	SFO	Simulated Flameout Operation
447	SI	Selective Interrogation
448	SIAP	Standard Instrument Approach Procedure
449	SID	Standard Instrument Departure
450	SIF	Selective Identification Friend or Foe
451	SIGMET	Significant Meteorological (Information) Report
452	SILs	Sector Inbound Lists
453	SIM	Simulator
454	SKYGUIDE	Air Traffic Control of Switzerland
455	SL	Sea Level
456	SLB	Side lobe Blanking
457	SLC	Side lobe Cancellation
458	SLOC	Slovenia Control
459	SM	Statute Mile
460	SMR	Surface Movement Radar
461	SOF	Supervisor of Flying
462	SOW	Statement of Work
463	SRC	Safety Regulation Commission (EUROCONTROL)
464	SRU	Safety Regulation Unit (EUROCONTROL)
465	SSR	Secondary Surveillance Radar
466	STAR	Standard Arrival Route or Standard Terminal Arrival Route
467	STARS	Standard Terminal Automation Replacement System
468	STB	Stop Bar
469	STCA	Short Term Conflict Alert
470	STD	Synthetic Training Device
471	STDMA	Self-organising Time Division Multiple Access (known as VHF digital link - Mode 4)
472	STNA	Service Technique de la Navigation Aerienne
473	STO	Short Take-Off
474	STOVL	Short Take-Off and Vertical Landing
475	STOL	Short Take-Off and Landing
476	STRATFOR	Eurocontrol Statistics and Forecasts Service
477	SUA	Special Use Airspace
478	SV	Supervisor
479	SVFR	Special Visual Flight Rules
480	SWT	Switch
481	SWY	Stopway
482	SYSCO	System Coordination – Data Exchange and Coordination
483	TA	Terminal Airspace
484	TAA	Terminal Arrival Area
485	TAAM	Total Airspace and Airport Modeller
486	TACAN	Tactical Air Navigation (System)
487	TACS	Theater Air Control System
488	TACTICOS	Tactical Information and Command System
489	TAF	Terminal Aerodrome/Area Forecast
490	TAIS	Tactical Airspace Integration System (US Army)
491	TAIS	Tactical Air Intelligence System
492	TAP	Target Acquisition Protocol
493	TARMAC	Taxi and Ramp Management and Control
494	TAS	Terminal Airspace System
495	TAS	True Air Speed
496	TAWS	Terrain Avoidance and Warning System
497	TCAS	Traffic alert and Collision Avoidance System
498	TCDS	Type Certificate Data Sheet
499	TCH	Threshold Crossing Height
500	TCL	Thrust Control Lever or Taxi Center Lights
501	TDW	Tower Display Workstation
502	TDZ	Runway Touchdown Zone Lighting
503	TDZE	Touch Down Zone Elevation
504	TERPS	US Standard for Terminal Instrument Procedures
505	TFDM	Terminal Flight Data Management
506	TFDPS	Tower Flight Data Processing System
507	TFM	Traffic Flow Management
508	TFR	Temporary Flight Restriction
509	TH	True Heading
510	TID	Touch Input Device
511	TIS	Traffic Information System
512	TLOF	Touchdown and Lift-off Area
513	TM	Traffic Management
514	TMA	Terminal Control Area
515	TOC	Top Of Climb
516	TOD	Top Of Descent
517	TODA	Take-off Distance Available
518	TODAH	Take-off Distance Available for Helicopter
519	TOP	Take-Off Power
520	TOR	Terms of Reference, or Tornado aircraft
521	TORA	Takeoff Run Available
522	TOWSIM	Tower Simulator
523	TRACON	Terminal Radar Approach Control
524	TRH	Thrust Reduction Height
525	TSO	Technical Standard Order
526	TSTC	Texas State Technical College
527	TT	True Track
528	TVOR	Terminal VOR
529	TWEB	Transcribed Weather Broadcast (USA for ATIS)
530	TWR	Control Tower or Thrust to Weight Ratio
531	TWY	Taxiway
532	TXC	Taxiway Centreline Lights
533	TXE	Taxiway Edge Lights
534	UA	Unmanned Aircraft
535	UAC	Upper Area Control Centre
536	UAM	Urban Air Mobility
537	UAS	Unmanned Aircraft Systems
538	UAT	Universal Access Transceiver
539	UAV	Unmanned Aerial Vehicle
540	UCAV	Unmanned Combat Aerial Vehicle
541	UDF	Ultra High Frequency Direction Finding
542	UEI	Units, Equipment, Installations
543	UFA	UFA, Inc., the world's premier developer of Air Traffic Control simulation systems
544	UHF	Ultra High Frequency (300MHz to 3 GHz)
545	UIR	Upper Flight Information Region
546	UKCAA	United Kingdom Civil Aviation Authority
547	UMASS	University of Massachusetts
548	URET	User Request Evaluation Tool
549	USAF	United States Air Force
550	UTA	Upper Traffic Area
551	V2	Takeoff speed. The speed at which the aircraft may safely be climbed with one engine inoperative
552	VAR	Magnetic Variation
553	VASI	Visual Approach Slope Indicator
554	VASIS	Visual Approach Slope Indicator System
555	VCS	Voice Communication System
556	VCCS	Voice Communication Control System
557	VCOA	Visual Climb Over Airport
558	VDF	Very High Frequency Direction Finding
559	VDGS	Visual Docking Guidance System, Visual Database Generation System
560	VDL-4	VHF digital link Mode 4 (see also STDMA)
561	VDU	Visual Display Unit
562	VFS	Vertical Flight Society
563	VFOW	Vertical Field of View
564	VFR	Visual Flight Rules
565	VHF	Very High Frequency (3 to 300MHz)
566	VLF	Very Low Frequency
567	VMC	Visual Meteorological Conditions
568	VOLMET	Meteorological Information for Aircraft in Flight
569	VOR	VHF Omni-directional Receiver
570	VORTAC	VOR -TACAN combination
571	VREF	1.3 times the stalling speed of the aircraft in the stated landing configuration and at the prevailing aircraft weight
572	VRS	Vortex Ring State
573	VS	Stall speed, defined as the minimum steady flight speed at which the airplane is controllable
574	VSBY	Visibility
575	VSP	Vertical Speed
576	VSTOL	Vertical Short Take-Off and Landing
577	VTC	Visual Terminal Chart
578	VTC	Virtual Training Centre
579	VTOL	Vertical Take-Off and Landing
580	VTOSL	Vertical Take-Off and Short Landing
581	VTS	Vehicle Tracking System
582	Vtoss	Take-off safety speed
583	Vy	Optimimum climbing speed
584	Vz	Rate-of-climb
585	WA	Wind Angle
586	WAAS	Wide Area Augmentation System
587	WAM	Wide Area Multilateration
588	WBS	Work Break-down Structure
589	WCA	Wind Correction Angle
590	WDI	Wind Direction Indicator
591	WGS	World Geodetic System
592	WIAS	Wetter Informations- und Anzeigesystem (German)
593	WP	Waypoint
594	WS	Work Station
595	WTC	Wake Turbulence Category
596	WTWS	Wake Turbulence Warning System
597	WX	Weather
598	WXR	Weather Radar Transceiver