Aeronautical Terms beginning with I
IAF
Initial Approach Fix
IAP
Instrument Approach Procedure
IAS
Indicated Air Speed
IAWP
Initial Approach Waypoint
ICAO
International Civil Aviation Organization
IF
Intermediate Fix
IFR
Instrument Flight Rules
ILS
Instrument Landing System
ILS/PRM
Instrument Landing System/Precision Runway Monitor
IM
Inner Marker
IMC
Instrument Meteorological Conditions
INS
Inertial Navigation System
IR
IFR Military Training Route
IRU
Inertial Reference Unit
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