Plain English Meaning

If your radios stop working while flying on an instrument flight plan, you don't just guess what to do. There are specific rules that tell you what route to fly, what altitude to hold, and when to begin your approach, so controllers can predict where you'll be and keep other traffic clear of you.

Full Definition

The set of procedures a pilot must follow when flying under Instrument Flight Rules and experiencing a two-way radio communications failure. The pilot continues the flight using prescribed rules in 14 CFR 91.185 covering route, altitude, and timing of the approach, allowing ATC to anticipate the aircraft's intentions without further .