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