Definition 1 of 2
Plain English Meaning
The lowest throttle position used while flying. The engine is still running and ready to respond, just producing very little power.
Full Definition
The minimum throttle setting used in flight, where the engine is producing the lowest power it is rigged to deliver while the airplane is airborne. It is set higher than ground idle so the engine continues to respond promptly when power is reapplied and supports systems such as the alternator, vacuum pump, and hydraulics during low-power flight phases like descents and approaches.
Context Anchor
Used during power-off accuracy approaches, descents, and landing when reduces power but keeps the engine running.