Plain English Meaning

Whether the pilot is properly trained, current, and skilled enough to fly using only the instruments in clouds or low-visibility weather, instead of looking outside.

Full Definition

A pilot's qualification, currency, and proficiency to legally and safely conduct flight under Instrument Flight Rules (IFR). It includes holding a valid instrument rating on the appropriate pilot certificate, meeting recent instrument experience requirements (such as the approaches, holding, and tracking tasks required within the preceding six calendar months), and possessing the practical skill to fly the solely by to instruments in actual or .