Abbreviation/ Meaning
Acronym
DH . . . . . . . . Decision Height
DME . . . . . . . Distance Measuring Equipment
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

Abbreviation/ Meaning
Acronym
FSDO . . . . . . Flight Standards District Office
FSS . . . . . . . . Flight Service Station
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