PowerShell/data/dicts/aviation.csv

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