Glossary "I"

IFR (Instrument Flight Rules)

Rules governing the procedures for conducting instrument flight. Also a term used by pilots and controllers to indicate type of flight plan.

IFR Conditions

"Weather conditions below the minimums allowed for flight under visual flight rules." (14 CFR part 1)


A welding striker, piezo sparker, matches, or other means used to ignite the balloon pilot flame.



An occurrence other than an accident, associated with the operation of an aircraft, which affects or could affect the safety of operations.

Indicated Altitude

The altitude shown on a properly calibrated altimeter. Inoperative Not functioning or not working.


Instructions for Continued Airworthiness

A manual published by an aircraft manufacturer specifying procedures for inspection, maintenance, repair, and mandatory replacement times for life-limited parts.


"A device using an internal mechanism to show visually or aurally the attitude, altitude, or operation of an aircraft or aircraft part." (14 CFR part 1) There are only two instruments required in a hot air balloon: vertical speed indicator (VSI) and altimeter.


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