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Aviation abbreviation dictionary
                                                 

I

IA — Inspection authorisation
IAC — Instrument approach chart
IAF — Initial approach fix
IAL — Instrument approach and landing chart
IAO — In and out of clouds
IAOA — Indicated angle of attack
IAP — Instrument approach plate
IAR — Intersection of air routes
IAS — Indicated airspeed
IATA — International Air Transport Association
IAW — In accordance with
IAWP — Initial approach waypoint
IBN — Identification beacon
IC — Ice crystals
ICA — Instructions for continuing airworthiness
ICAAS — Integrated control in avionics for air superiority
ICAO — International Civil Aviation Organization
ICE — Ice, icing
ICUS — In-command under supervision
ID — Identify, identifier
IDENT — Identification
IEPR — Integrated engine pressure ratio
IF — Instrument flight
IF — Intermediate approach fix
IF — Intermediate frequency
IFF — Identification friend/Foe
IFR — Instrument flight rules
IFRB — International Frequency Registration Board
IFSD — In-flight shutdown
IG — Implementation group
IGA — International general aviation
IGFET — Insulated gate field effect transistor
ILS — Instrument landing system
IM — Inner marker
IMC — Indirect maintenance cost
IMC — Instrument meteorological conditions
IMG — Immigration
IMI — Interrogation sign
IMPR — Improve, improving, improvement
IMT — Immediate, immediately
INA — Initial approach
INBD — Inbound
INC — In cloud
INCERFA — Uncertainty phase
INFO — Information
INIT — Initialization
INOP — Inoperative
INP — If not possible
INPR — In progress
INR — Image navigation and tegistration
INS — Inertial navigation system
INSTL — Install, installed, installation
INSTR — Instrument
INT — Intersection
INTC — Intercept
INTER — Intermittent, intermittently
INTL — International
INTRG — Interrogator
INTRP — Interrupt, interrupted, interruption
INTSF — Intensify, intensifying
INTST — Intensity
IOA — Instrument of appointment
IOC — Indirect operating cost
IOE — Initial operational experience
IPC — Illustrated parts catalogue
IPT — Integrated product team
IR — Ice on runway
IREX — Instrument training examination
IRM — Immediately reportable matters
IRS — Inertial reference system
IRS — Internal reporting system
IRU — Inertial reference unit
ISA — International standard atmosphere
ISB — Independent sideband
ISIM — Integrated safety investigation methodology
ISO — International Standards Organization
ISOL — Isolated
ITT — Interstage turbine temperature
ITU — International Telecommunications Union
IWI — Illuminated wind indicator
IWP — Intermediate waypoint

All times are UTC