PowerShell/Data/Abbr/aviation.csv

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