Aviation Maintenance Terms beginning with I

I.D.

Inner Diameter

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I/O

Input/Output

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IAPS

Integrated Avionics Processor System

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IAS

Indicated airspeed.

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ICA

Instructions for Continued Airworthiness

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ICAO

The International Civil Aeronautical Organization.

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ID

Identification

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IDG

Integrated drive generator. An AC generator installed on turbine engines. An IDG incorporates a brushless, three- phase AC generator and a constant-speed drive in a single component.

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IF

Intermediate Frequency

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IFR

Instrument flight rules.

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IGN

Ignition

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IHP

Indicated horsepower. The theoretical horse-power a reciprocating engine develops.

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IIS

Integrated Instrument System

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ILS

Instrument Landing System

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IMEP

Indicated mean effective pressure. The average pressure existing inside the cylinder of a reciprocating engine during its power stroke.

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INDL

Indicator Light

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INS

Inertial Navigation System.

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INST

Instrument

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INSTR

Instrument

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INTCON

Interconnect

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INTEC

Interface

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INTER

Interrogation

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INTPH

Interphone

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INV

Inverter

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IR ILS

Receiver

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IRS

Inertial Reference System.

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IRU

Inertial Reference Unit.

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ITP

In-Trail Procedure

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