Definition
An impending stall is the flight condition occurring just before the wing actually stalls, signaled by the first indications of an approaching stall — such as the stall warning horn, aerodynamic buffet, reduced control effectiveness, or a high pitch attitude that cannot be increased without losing altitude. Recovery is initiated at the first indication, before the wing reaches the critical angle of attack and an actual stall occurs.
Plain English
It's the moment when the airplane is about to stall but hasn't yet. The pilot recognizes the early warning signs and recovers right then, before the wing actually quits flying.
Context Anchor
Seen during stall training, slow flight, takeoff practice, climb practice, approach practice, and any situation where the airplane is flown near its minimum safe flying speed.
Derivation
Impending' comes from the Latin 'impendere,' meaning 'to hang over' or 'to be about to happen.' An impending stall is one that is hanging over the airplane — close, but not yet here. That captures the idea exactly: the pilot acts on the warning, not on the stall itself.
Why Pilots Care
Recognizing an impending stall lets the pilot recover with little altitude loss and avoids entering a full stall, which is especially important near the ground or during training.
Analogy
It is like feeling a car’s tires start to slide before the car fully skids. That early warning is the moment to correct, not the moment to wait and see what happens.
Intuition Check
Do not read “impending” as “already happening.” An impending stall is the warning stage before the full stall, not the completed stall.
Example Sentence 1
During the checkride, the examiner asked the applicant to demonstrate an impending stall in a power-off landing configuration and to recover at the first sign of buffet.
Example Sentence 2
In the traffic pattern the pilot watched for cues of an impending stall and reduced angle of attack before the airplane could enter a full stall.