1.    ACAS   =   Airborne collision avoidance system
2.    ACC     =   Area control center or area control
3.    ADF     =   Automatic direction finding equipment
4.    ADGS   =   Aircraft Docking Guidance System
5.    ADIZ     =   Air defense identification zone (to be pronounced    “ADIZ”)
6.    AFS      =   Aeronautical fixed service
7.    AFTN    =   Aeronautical fixed telecommunication network
8.    APAPI  =   Abbreviated precision approach path indicator
9.    AIC       =   Aeronautical information circular
10.   AIP       =   Aeronautical information publication
11.   AIS       =   Aeronautical information services
12.   AMS     =   Aeronautical mobile service
13.   AMSC   =   Aeronautical Message Switching Centre
14.   AMOS  =   Automatic meteorological abbreviation system
15.   AOC     =   Aerodrome obstacle chart
16.   APP     =   Approach control office or approach control or approach control service
17.   ARO     =   Air traffic services reporting office
18.   ATA      =   Actual time of arrival
19.   ATC      =   Air traffic control (in general)
20.   ATD      =   Actual time of departure
21.   ATIS     =   Automatic Terminal Information Service
22.   AIRAC  =   Aeronautical information regulation and control
23.   ATM     =   Air traffic management
24.   ATN      =   Aeronautical telecommunication network
25.   ATS      =   Air traffic service
26.   ATZ      =   Aerodrome traffic Zone
27.   CAT      =   Category or clear air turbulance
28.   CNS     =   Communications, navigation and surveillance
29.   COM     =   Communication
30.   CTA      =   Control area
31.   CTR      =   Control zone
32.   DA       =   Decesion altitude
33.   DS       =   Direct speech
34.   DGAC   =   Directorate General of Air Communication
35.   DME     =   Distance measuring equipment
36.   DVOR   =   Doppler VOR
37.   EAT      =   Expected approach time
38.   EET      =   Estimated elapsed time
39.   ELBA    =   Emergency location beacon – aircraft

40.   EOBT   =   Estimate off-block time
41    ETA      =   Estimated time of arrival or estimating arrival
42.   ETD      =   Estimate time of departure or estimating departured
43.   FA        =   Flight approval
44.   FIC       =   Flight information Centre
45.   FIR       =   Flight information Region
46.   FIS       =   Flight Information Service
47.   FISA     =   Automated flight information service
48.   FL        =   Flight level
49.   GCA     =   Ground Controlled approach system or ground controlled approach
50.   GNSS   =   Global navigation satellite system
51.   GP       =   Glide path
52.   GPS     =   Global positioning system
53.   HF        =   High frequency (3000 to 30,000 KHz)
54.   HIAL     =   High intensity approach and runway lighting
55.   IAF       =   Indonesia air force
56.   ICAO    =   International civil aviation organization
57.   IDENT   =   Identification
58.   IFR       =   Instrument flight rules
59    ILS       =   Instrument landing system
60.   IMC      =   Instrument meteorological conditions
61.   INS       =   Inertial Navigation system
62.   LC        =   Landing chart
63.   LDA      =   Landing distance available
64.   LF        =   Low frequency (30 to 300 KHz)
65.   LLZ       =   Localizer
66.   LORAN =   LORAN (Long range air navigation System)
67.   MWARA    =          Major world air route area
68.   NAV     =   Navigation
69.   NDB     =   Non-directional beacon
70.   NM       =   Nautical miles
71.   NOTAM =   Notice to Airmen
72.   PALS    =   Precision approach lighting system (specipy category)
73.   PAPI     =   Precision approach path indicator
74.   PIB       =   Pre-flight information bulletin
75.   PSR     =   Primary surveillance radar
76.   RADAR =   Radio detection and ranging
77.   RAF      =   Royal air force
78.   RCC     =   Rescue co-ordination centre
79.   RDARA =   Regional domestic air route area
80.   RLLS    =   Runway lead-in lighting system (to be pronounce “AR-NAV”)
81.   RNAV   =   Area navigation
82.   RPI       =   Radar position indication
83.   RVR     =   Runway visual range
84.   SAR     =   Search and Rescue
85.   SELCAL    =          Selective calling system
86.   SID       =   Standard Instrument Departure
87.   SMC     =   Surface movement control
88.   SMR     =   Surface movement radar
89.   SSR     =   Secondary surveillance radar
90.   STAR    =   Standard Instrument arrival
91.   TMA     =   Terminal control area
92.   TODA   =   Take-off distance available
93.   TORA   =   Take-off run available
94.   TWR     =   Aerodrome control tower or aerodrome control
95.   UHF      =   Ultra high frequency (300 to 3000 MHz)
96.   UIR       =   Upper flight information region
97.   UTA      =   Upper control area
98.   VFR      =   Visual flight rules
99.   VHF      =   Very high frequency
100. VLF      =   Very low frequency (3 to 30 MHz)
101. VOR     =   VHF omnidirectional radio range
102. VORTAC=  VOR and TACAN combination
103. VSCS   =   Voice Switching and Control System
104. WAC     =   World Aeronautical Chart ICAO 1:1,000.000
105. WDI      =   Wind direction indicator

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