|
Abbreviation/Acronym
|
Meaning
|
|
AAWU
|
Alaskan Aviation Weather Unit
|
|
AAS
|
Airport Advisory Service
|
|
AC
|
Advisory Circular
|
|
ACAR
|
Aircraft Communications Addressing and
Reporting System
|
|
ADCUS
|
Advise Customs
|
|
ADDS
|
Aviation Digital Data Service
|
|
ADF
|
Automatic Direction Finder
|
|
ADIZ
|
Air Defense Identification Zone
|
|
ADS-B
|
Automatic Dependent
Surveillance-Broadcast
|
|
AeroNav
|
Aeronautical Navigation Products
|
|
AFB
|
Air Force Base
|
|
AFCS
|
Automatic Flight Control System
|
|
A/FD
|
Airport/Facility Directory
|
|
AFIS
|
Automatic Flight Information Service
|
|
AFM
|
Aircraft Flight Manual
|
|
AGL
|
Above Ground Level
|
|
AHRS
|
Attitude Heading Reference System
|
|
AIM
|
Aeronautical Information Manual
|
|
AIRMET
|
Airmen's Meteorological Information
|
|
ALD
|
Available Landing Distance
|
|
ALS
|
Approach Light Systems
|
|
AMSL
|
Above Mean Sea Level
|
|
ANP
|
Actual Navigation Performance
|
|
AOCC
|
Airline Operations Control Center
|
|
AP
|
Autopilot System
|
|
APV
|
Approach with Vertical Guidance
|
|
AR
|
Authorization Required
|
|
ARENA
|
Areas Noted for Attention
|
|
ARFF IC
|
Aircraft Rescue and Fire Fighting Incident
Commander
|
|
ARINC
|
Aeronautical Radio Incorporated
|
|
ARO
|
Airport Reservations Office
|
|
ARSA
|
Airport Radar Service Area
|
|
ARSR
|
Air Route Surveillance Radar
|
|
ARTCC
|
Air Route Traffic Control Center
|
|
ARTS
|
Automated Radar Terminal System
|
|
ASDE-X
|
Airport Surface Detection Equipment -
Model X
|
|
ASOS
|
Automated Surface Observing System
|
|
ASR
|
Airport Surveillance Radar
|
|
ASRS
|
Aviation Safety Reporting System
|
|
ATC
|
Air Traffic Control
|
|
ATCRBS
|
Air Traffic Control Radar Beacon System
|
|
ATCSCC
|
Air Traffic Control System Command
Center
|
|
ATCT
|
Airport Traffic Control Tower
|
|
ATD
|
Along-Track Distance
|
|
ATIS
|
Automatic Terminal Information Service
|
|
ATT
|
Attitude Retention System
|
|
AWC
|
Aviation Weather Center
|
|
AWOS
|
Automated Weather Observing System
|
|
AWSS
|
Automated Weather Sensor System
|
|
AWTT
|
Aviation Weather Technology Transfer
|
|
AWW
|
Severe Weather Forecast Alert
|
|
BAASS
|
Bigelow Aerospace Advanced Space
Studies
|
|
BBS
|
Bulletin Board System
|
|
BC
|
Back Course
|
|
BECMG
|
Becoming group
|
|
C/A
|
Coarse Acquisition
|
|
CARTS
|
Common Automated Radar Terminal
System (ARTS) (to include ARTS IIIE and
ARTS IIE)
|
|
CAT
|
Clear Air Turbulence
|
|
CD
|
Controller Display
|
|
CDI
|
Course Deviation Indicator
|
|
CDR
|
Coded Departure Route
|
|
CERAP
|
Combined Center/RAPCON
|
|
CFA
|
Controlled Firing Area
|
|
CFIT
|
Controlled Flight into Terrain
|
|
CFR
|
Code of Federal Regulations
|
|
COA
|
Certificate of Waiver or Authorization
|
|
CPDLC
|
Controller Pilot Data Link
Communications
|
|
CTAF
|
Common Traffic Advisory Frequency
|
|
CVFP
|
Charted Visual Flight Procedure
|
|
CVRS
|
Computerized Voice Reservation System
|
|
CWA
|
Center Weather Advisory
|
|
CWSU
|
Center Weather Service Unit
|
|
DA
|
Decision Altitude
|
|
DCA
|
Ronald Reagan Washington National
Airport
|
|
DCP
|
Data Collection Package
|
|
DER
|
Departure End of Runway
|
|
DH
|
Decision Height
|
|
DME/N
|
Standard DME
|
|
DME/P
|
Precision DME
|
|
DOD
|
Department of Defense
|
|
DP
|
Instrument Departure Procedure
|
|
DPU
|
Data Processor Unit
|
|
DRT
|
Diversion Recovery Tool
|
|
DRVSM
|
Domestic Reduced Vertical Separation
Minimum
|
|
DUATS
|
Direct User Access Terminal System
|
|
DVA
|
Diverse Vector Area
|
|
DVFR
|
Defense Visual Flight Rules
|
|
DVRSN
|
Diversion
|
|
EDCT
|
Expect Departure Clearance Time
|
|
EFAS
|
En Route Flight Advisory Service
|
|
EFV
|
Enhanced Flight Visibility
|
|
EFVS
|
Enhanced Flight Vision System
|
|
ELT
|
Emergency Locator Transmitter
|
|
EMAS
|
Engineered Materials Arresting System
|
|
EPE
|
Estimate of Position Error
|
|
ESV
|
Expanded Service Volume
|
|
ETA
|
Estimated Time of Arrival
|
|
ETD
|
Estimated Time of Departure
|
|
ETE
|
Estimated Time En Route
|
|
EWINS
|
Enhanced Weather Information System
|
|
EWR
|
Newark International Airport
|
|
FA
|
Area Forecast
|
|
FAA
|
Federal Aviation Administration
|
|
FAF
|
Final Approach Fix
|
|
FAROS
|
Final Approach Runway Occupancy Signal
|
|
FAWP
|
Final Approach Waypoint
|
|
FB
|
Fly-by
|
|
FCC
|
Federal Communications Commission
|
|
FD
|
Flight Director System
|
|
FDC
|
Flight Data Center
|
|
FDE
|
Fault Detection and Exclusion
|
|
FIR
|
Flight Information Region
|
|
FIS
|
Flight Information Service
|
|
FISDL
|
Flight Information Services Data Link
|
|
FLIP
|
Flight Information Publication
|
|
FMS
|
Flight Management System
|
|
FMSP
|
Flight Management System Procedure
|
|
FO
|
Fly-over
|
|
FPA
|
Flight Path Angle
|
|
FPV
|
Flight Path Vector
|
|
FPNM
|
Feet Per Nautical Mile
|
|
FSDO
|
Flight Standards District Office
|
|
FSS
|
Flight Service Station
|
|
DME
|
Distance Measuring Equipment
|
|
GBAS
|
Ground Based Augmentation System
|
|
GEO
|
Geostationary Satellite
|
|
GLS
|
GBAS Landing System
|
|
GNSS
|
Global Navigation Satellite System
|
|
GNSSP
|
Global Navigation Satellite System Panel
|
|
GPS
|
Global Positioning System
|
|
GRI
|
Group Repetition Interval
|
|
GSD
|
Geographical Situation Display
|
|
GUS
|
Ground Uplink Station
|
|
HAT
|
Height Above Touchdown
|
|
HDTA
|
High Density Traffic Airports
|
|
HEMS
|
Helicopter Emergency Medical Services
|
|
HIRL
|
High Intensity Runway Lights
|
|
HIWAS
|
Hazardous Inflight Weather Advisory
Service
|
|
HRR
|
Helicopter Rapid Refueling Procedures
|
|
HUD
|
Head-Up Display
|
|
Hz
|
Hertz
|
|
IAF
|
Initial Approach Fix
|
|
IAP
|
Instrument Approach Procedure
|
|
IAS
|
Indicated Air Speed
|
|
IAWP
|
Initial Approach Waypoint
|
|
ICAO
|
International Civil Aviation Organization
|
|
IF
|
Intermediate Fix
|
|
IFIM
|
International Flight Information Manual
|
|
IFR
|
Instrument Flight Rules
|
|
ILS
|
Instrument Landing System
|
|
ILS/PRM
|
Instrument Landing System/Precision
Runway Monitor
|
|
IM
|
Inner Marker
|
|
IMC
|
Instrument Meteorological Conditions
|
|
InFO
|
Information For Operators
|
|
INS
|
Inertial Navigation System
|
|
IOC
|
Initial Operational Capability
|
|
IR
|
IFR Military Training Route
|
|
IRU
|
Inertial Reference Unit
|
|
ITWS
|
Integrated Terminal Weather System
|
|
JFK
|
John F. Kennedy International Airport
|
|
kHz
|
Kilohertz
|
|
LAA
|
Local Airport Advisory
|
|
LAAS
|
Local Area Augmentation System
|
|
LAHSO
|
Land and Hold Short Operations
|
|
LAWRS
|
Limited Aviation Weather Reporting
Station
|
|
LDA
|
Localizer Type Directional Aid
|
|
LDA/PRM
|
Localizer Type Directional Aid/Precision
Runway Monitor
|
|
LGA
|
LaGuardia Airport
|
|
LIRL
|
Low Intensity Runway Lights
|
|
LLWAS
|
Low Level Wind Shear Alert System
|
|
LLWAS NE
|
Low Level Wind Shear Alert System
Network Expansion
|
|
LLWAS-RS
|
Low Level Wind Shear Alert System
Relocation/Sustainment
|
|
LNAV
|
Lateral Navigation
|
|
LOC
|
Localizer
|
|
LOP
|
Line-of-position
|
|
LORAN
|
Long Range Navigation System
|
|
LP
|
Localizer Performance
|
|
LPV
|
Localizer Performance with Vertical
Guidance
|
|
LUAW
|
Line Up and Wait
|
|
LZ
|
Landing Zone
|
|
MAHWP
|
Missed Approach Holding Waypoint
|
|
MAP
|
Missed Approach Point
|
|
MAWP
|
Missed Approach Waypoint
|
|
MDA
|
Minimum Descent Altitude
|
|
MEA
|
Minimum En Route Altitude
|
|
MEARTS
|
Micro En Route Automated Radar
Tracking System
|
|
METAR
|
Aviation Routine Weather Report
|
|
MHz
|
Megahertz
|
|
MIRL
|
Medium Intensity Runway Lights
|
|
MLS
|
Microwave Landing System
|
|
MM
|
Middle Marker
|
|
MOA
|
Military Operations Area
|
|
MOCA
|
Minimum Obstruction Clearance Altitude
|
|
MRA
|
Minimum Reception Altitude
|
|
MRB
|
Magnetic Reference Bearing
|
|
MSA
|
Minimum Safe Altitude
|
|
MSAW
|
Minimum Safe Altitude Warning
|
|
MSL
|
Mean Sea Level
|
|
MTI
|
Moving Target Indicator
|
|
MTOS
|
Mountain Obscuration
|
|
MTR
|
Military Training Route
|
|
MVA
|
Minimum Vectoring Altitude
|
|
MWA
|
Mountain Wave Activity
|
|
MWO
|
Meteorological Watch Office
|
|
NAS
|
National Airspace System
|
|
NASA
|
National Aeronautics and Space
Administration
|
|
NAVAID
|
Navigational Aid
|
|
NAVCEN
|
Coast Guard Navigation Center
|
|
NCWF
|
National Convective Weather Forecast
|
|
NDB
|
Nondirectional Radio Beacon
|
|
NEXRAD
|
Next Generation Weather Radar
|
|
NFDC
|
National Flight Data Center
|
|
NGA
|
National Geospatial-Intelligence Agency
|
|
NM
|
Nautical Mile
|
|
NMAC
|
Near Midair Collision
|
|
NOAA
|
National Oceanic and Atmospheric
Administration
|
|
NOPAC
|
North Pacific
|
|
NoPT
|
No Procedure Turn Required
|
|
NOTAM
|
Notice to Airmen
|
|
NPA
|
Nonprecision Approach
|
|
NRS
|
Navigation Reference System
|
|
NSA
|
National Security Area
|
|
NSW
|
No Significant Weather
|
|
NTAP
|
Notices to Airmen Publication
|
|
NTSB
|
National Transportation Safety Board
|
|
NTZ
|
No Transgression Zone
|
|
NWS
|
National Weather Service
|
|
OAT
|
Outside Air Temperature
|
|
OBS
|
Omni-bearing Selector
|
|
ODP
|
Obstacle Departure Procedure
|
|
OIS
|
Operational Information System
|
|
OIS
|
Obstacle Identification Surface
|
|
OM
|
Outer Marker
|
|
ORD
|
Chicago O'Hare International Airport
|
|
PA
|
Precision Approach
|
|
PAPI
|
Precision Approach Path Indicator
|
|
PAR
|
Precision Approach Radar
|
|
PAR
|
Preferred Arrival Route
|
|
PC
|
Personal Computer
|
|
P/CG
|
Pilot/Controller Glossary
|
|
PDC
|
Pre-departure Clearance
|
|
PFD
|
Personal Flotation Device
|
|
PinS
|
Point-in-Space
|
|
PIREP
|
Pilot Weather Report
|
|
POB
|
Persons on Board
|
|
POFZ
|
Precision Obstacle Free Zone
|
|
POI
|
Principal Operations Inspector
|
|
PPS
|
Precise Positioning Service
|
|
PRM
|
Precision Runway Monitor
|
|
PT
|
Procedure Turn
|
|
QICP
|
Qualified Internet Communications
Provider
|
|
RA
|
Resolution Advisory
|
|
RAA
|
Remote Advisory Airport
|
|
RAIM
|
Receiver Autonomous Integrity Monitoring
|
|
RAIS
|
Remote Airport Information Service
|
|
RBDT
|
Ribbon Display Terminals
|
|
RCAG
|
Remote Center Air/Ground
|
|
RCC
|
Rescue Coordination Center
|
|
RCLS
|
Runway Centerline Lighting System
|
|
RCO
|
Remote Communications Outlet
|
|
RD
|
Rotor Diameter
|
|
REIL
|
Runway End Identifier Lights
|
|
REL
|
Runway Entrance Lights
|
|
RFM
|
Rotorcraft Flight Manual
|
|
RIL
|
Runway Intersection Lights
|
|
RLIM
|
Runway Light Intensity Monitor
|
|
RMI
|
Radio Magnetic Indicator
|
|
RNAV
|
Area Navigation
|
|
RNP
|
Required Navigation Performance
|
|
ROC
|
Required Obstacle Clearance
|
|
RPAT
|
RNP Parallel Approach Runway
Transitions
|
|
RVR
|
Runway Visual Range
|
|
RVSM
|
Reduced Vertical Separation Minimum
|
|
RWSL
|
Runway Status Light
|
|
SAFO
|
Safety Alerts For Operators
|
|
SAM
|
System Area Monitor
|
|
SAR
|
Search and Rescue
|
|
SAS
|
Stability Augmentation System
|
|
SBAS
|
Satellite-based Augmentation System
|
|
SCAT-1
DGPS
|
Special Category I Differential GPS
|
|
SDF
|
Simplified Directional Facility
|
|
SFL
|
Sequenced Flashing Lights
|
|
SFR
|
Special Flight Rules
|
|
SIAP
|
Standard Instrument Approach Procedure
|
|
SID
|
Standard Instrument Departure
|
|
SIGMET
|
Significant Meteorological Information
|
|
SM
|
Statute Mile
|
|
SMGCS
|
Surface Movement Guidance Control
System
|
|
SNR
|
Signal-to-noise Ratio
|
|
SOIA
|
Simultaneous Offset Instrument
Approaches
|
|
SOP
|
Standard Operating Procedure
|
|
SPC
|
Storm Prediction Center
|
|
SPS
|
Standard Positioning Service
|
|
STAR
|
Standard Terminal Arrival
|
|
STARS
|
Standard Terminal Automation
Replacement System
|
|
STMP
|
Special Traffic Management Program
|
|
SWSL
|
Supplemental Weather Service Locations
|
|
TA
|
Traffic Advisory
|
|
TAA
|
Terminal Arrival Area
|
|
TAC
|
Terminal Area Chart
|
|
TACAN
|
Tactical Air Navigation
|
|
TAF
|
Aerodrome Forecast
|
|
TAS
|
True Air Speed
|
|
TCAS
|
Traffic Alert and Collision Avoidance
System
|
|
TCH
|
Threshold Crossing Height
|
|
TD
|
Time Difference
|
|
TDLS
|
Tower Data Link System
|
|
TDWR
|
Terminal Doppler Weather Radar
|
|
TDZ
|
Touchdown Zone
|
|
TDZE
|
Touchdown Zone Elevation
|
|
TDZL
|
Touchdown Zone Lights
|
|
TEC
|
Tower En Route Control
|
|
THL
|
Takeoff Hold Lights
|
|
TIBS
|
Telephone Information Briefing Service
|
|
TIS
|
Traffic Information Service
|
|
TIS-B
|
Traffic Information Service-Broadcast
|
|
TLS
|
Transponder Landing System
|
|
TPP
|
Terminal Procedures Publications
|
|
TRSA
|
Terminal Radar Service Area
|
|
TSO
|
Technical Standard Order
|
|
TWEB
|
Transcribed Weather Broadcast
|
|
TWIB
|
Terminal Weather Information for Pilots
System
|
|
UA
|
Unmanned Aircraft
|
|
UAS
|
Unmanned Aircraft System
|
|
UAV
|
Unmanned Aerial Vehicle
|
|
UFO
|
Unidentified Flying Object
|
|
UHF
|
Ultrahigh Frequency
|
|
U.S.
|
United States
|
|
USCG
|
United States Coast Guard
|
|
UTC
|
Coordinated Universal Time
|
|
UWS
|
Urgent Weather SIGMET
|
|
VAR
|
Volcanic Activity Reporting
|
|
VASI
|
Visual Approach Slope Indicator
|
|
VCOA
|
Visual Climb Over the Airport
|
|
VDA
|
Vertical Descent Angle
|
|
VDP
|
Visual Descent Point
|
|
VFR
|
Visual Flight Rules
|
|
VGSI
|
Visual Glide Slope Indicator
|
|
VHF
|
Very High Frequency
|
|
VIP
|
Video Integrator Processor
|
|
VMC
|
Visual Meteorological Conditions
|
|
VMINI
|
Instrument flight minimum speed, utilized
in complying with minimum limit speed
requirements for instrument flight
|
|
VNAV
|
Vertical Navigation
|
|
VNE
|
Never exceed speed
|
|
VNEI
|
Instrument flight never exceed speed,
utilized instead of VNE for compliance with
maximum limit speed requirements for
instrument flight
|
|
VOR
|
Very High Frequency Omni-directional
Range
|
|
VORTAC
|
VHF Omni-directional Range/Tactical Air
Navigation
|
|
VOT
|
VOR Test Facility
|
|
VR
|
VFR Military Training Route
|
|
VREF
|
The reference landing approach speed,
usually about 1.3 times Vso plus 50 percent
of the wind gust speed in excess of the
mean wind speed.
|
|
VSO
|
The stalling speed or the minimum steady
flight speed in the landing configuration at
maximum weight.
|
|
VTF
|
Vector to Final
|
|
VV
|
Vertical Visibility
|
|
VVI
|
Vertical Velocity Indicator
|
|
VY
|
Speed for best rate of climb
|
|
VYI
|
Instrument climb speed, utilized instead of
VY for compliance with the climb
requirements for instrument flight
|
|
WA
|
AIRMET
|
|
WAAS
|
Wide Area Augmentation System
|
|
WAC
|
World Aeronautical Chart
|
|
WFO
|
Weather Forecast Office
|
|
WGS-84
|
World Geodetic System of 1984
|
|
WMO
|
World Meteorological Organization
|
|
WMS
|
Wide-Area Master Station
|
|
WMSC
|
Weather Message Switching Center
|
|
WMSCR
|
Weather Message Switching Center
Replacement
|
|
WP
|
Waypoint
|
|
WRS
|
Wide-Area Ground Reference Station
|
|
WS
|
SIGMET
|
|
WSO
|
Weather Service Office
|
|
WSP
|
Weather System Processor
|
|
WST
|
Convective Significant Meteorological
Information
|
|
WW
|
Severe Weather Watch Bulletin
|