ENE East-northeast
ENR En-route (AIP Publication)
ENRT En-route
EOBT Estimated off-block time
EQPT Equipment
Es Spanish
ESE East-southeast
EST Estimate or estimated
ETA Estimated time of arrival or estimating arrival
ETD Estimated time of departure or estimating departure
ETO Estimated time over significant point
EUR European Region
Ev Every
EXC Except
EXER Exercise(s) or exercising or to exercise
EXP Expect or expected or expecting
EXTD Extend or extending
F
FAC Facilities
FAF French Air Force
FAF Final Approach Fix
FAL Facilitation of international air transport
FAP Final approach point
FATO Final approach and take-off area
FAWP Final approach waypoint
FBL Light (used to qualify icing, turbulence, interference or static reports)
FC Funnel cloud
FCST Forecast
FEB February
FG Fog
FIC Flight information centre
FIR Flight information region
FIS Flight information service
FL Flight level
FLG Flashing
FLT Flight
FLTCK Flight check
FLW Follow(s) or following
FLY Fly or flying
FM From
FNA Final approach
FLP Filed flight plan message
FPM Feet per minute
Fr French
FREQ Frequency
Fri Friday
FRNG Firing
FSL Full stop landing
FSS Flight service station
Ft Feet (dimensional unit)
FU Smoke
FZ Feezing
FZDZ Freezing drizzle
FZFG Freezing fog
FZRA Freezing rain
G
G Green
G/A Ground-to-air
G/A/G Ground-to-air and air-to-ground
GAF German Air Force
GCA Ground controlled approach system or ground controlled approach
GAFOR General Aviation forecast
GAMET Area forecast for low-level flights
GAT General Aviation Terminal
Ge German
GEN General
GEO Geographic or true
GLD Glider
GND Ground
GNDCK Ground check
GP Glide path
GPS Global Positioning System
GR Hail or soft hail
GRIB Processed meteorological data in the form of grid point values expressed in binary form (aeronautical meteorological code)
GS Ground speed
H
H24 Continuous day and night service
HBN Hazard beacon
HDF High frequency direction finding station
HDG Heading
HEL Helicopter
HF High frequency (3000 to 30000 kHz)
HGT Height or height above
HJ Sunrise to sunset
HLDG Holding
HN Sunset to sunrise
HOL Holiday
HPa Hectopascal
HR Hours
HS Service available during hours of schedule operation
HVY Heavy (used to qualify weather phenomena such as rain, e.g. heavy hail = HVYGR)
HX Not permanently active, no specific working hours
Hz Hertz (cycle per second)
I
IAC Instrument approach chart
IAF Initial approach fix
IAL Instrument approach and landing chart
IAS Indicated air speed
IAWP Intitial approach waypoint
IBN Identification beacon
IC Ice crystals (very small ice crystals in suspension, also known as diamond dust)
ICAO International Civil Aviation Organisation
ICE Icing
ID Identifier or identification or identify
Ident Identification
IF Intermediate approach fix
IFF Identification friend/foe
IFPS Integrated Initial Flight Plan Processing System
IFPZ Integrated Initial Flight Plan Processing Zone
IFR Instrument flight rules
IGA International general aviation
ILS Instrument landing system
IM Inner marker
IMC Instrument meteorological condition
IMPR Improve or improved
IMT Immediate or immediately
INA Initial approach
INBD Inbound
INCERFA Uncertainty phase
INFOBRIEF Information
INOP Inoperative
INS Inch(es) (dimensional unit)
INT Intersection
INTL International
INTST Intensity
IR Ice on runway
IWP Intermediate approach waypoint
J