Plain English Meaning

It is the slow-flight zone where flying slower actually takes more power, not less, because the wing has to work much harder to keep the airplane in the air.

Full Definition

The region of slow flight in which more power is required to maintain level flight as airspeed decreases, because induced drag rises sharply at low airspeeds and high angles of attack. In this region, the normal relationship between throttle and speed is reversed: reducing airspeed requires adding power, not reducing it.

Context Anchor

Encountered during slow flight, approach-to- , and discussions of how an airplane behaves near .