Aeronautical Terms beginning with I

IAF

Initial Approach Fix

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IAP

Instrument Approach Procedure

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IAS

Indicated Air Speed

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IAWP

Initial Approach Waypoint

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ICAO

International Civil Aviation Organization

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IF

Intermediate Fix

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IFIM

International Flight Information Manual

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IFR

Instrument Flight Rules

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ILS

Instrument Landing System

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ILS/PRM

Instrument Landing System/Precision Runway Monitor

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IM

Inner Marker

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IMC

Instrument Meteorological Conditions

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INS

Inertial Navigation System

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IOC

Initial Operational Capability

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IR

IFR Military Training Route

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IRU

Inertial Reference Unit

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ITWS

Integrated Terminal Weather System

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