Aviation Glossary
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IAS
Definition of: IAS
Indicated airspeed
IFR
Definition of: IFR
Instrument Flight Rules, governing the conduct of flight under instrument meteorological conditions.
ILS
Definition of: ILS
Instrument Landing System. A radar-based system allowing ILS-equipped aircraft to find a runway and land when clouds may be as low as 200 feet (or lower for special circumstances).
INDICATED AIRSPEED (IAS)
Definition of: INDICATED AIRSPEED (IAS)
A direct instrument reading obtained from an airspeed indicator uncorrected for altitude, temperature, atmospheric density, or instrument error. Compare CALIBRATED AIRSPEED and TRUE AIRSPEED.
INSTRUMENT METEOROLOGICAL CONDITIONS (IMC)
Definition of: INSTRUMENT METEOROLOGICAL CONDITIONS (IMC)
Meteorological conditions expressed in terms of visibility, distance from clouds, and ceiling less than minima specified for visual meteorological conditions (VMC).
IRON COMPASS
Definition of: IRON COMPASS
Railroad tracks, as favored by pilots of yore as a dependable aid to surface navigation.
