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