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