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What is the meaning of the abbreviation "IFR"?

  • A

    Instrument Meteorological Conditions.

  • B

    Commercial Flight Rules.

  • C

    Bad Weather Flight Rules.

  • D

    Instrument Flight Rules.

Instrument Flight Rules (IFR) and Visual Flight Rules (VFR) are the two primary sets of regulations governing civil aviation aircraft operations.

IFR is used when flying under conditions where reliance on outside visual references is not safe or possible. This typically includes conditions such as low visibility due to weather, flying at night, or flying through clouds. Under IFR, pilots navigate and control the aircraft primarily by reference to instruments within the cockpit, often with the assistance of air traffic control.

In contrast, VFR is used when flying under conditions where the pilot can see and avoid obstacles and other aircraft by reference to the ground and other visual cues. VFR flight is conducted in clear weather conditions and requires visual contact with the ground and other aircraft at all times.

Both sets of rules serve to ensure the safe and orderly conduct of flight operations, with IFR primarily addressing situations where visual references are limited or not available.

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