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An impending
stall occurs when the airplane is approaching,
but does not exceed the critical AOA. The purpose
of practicing impending stalls is to learn to
retain or regain full control of the airplane
immediately upon recognizing that it is nearing
a stall, or that a stall is likely to occur
if the pilot does not take appropriate action.
Pilot training should emphasize teaching the
same recovery technique for impending stalls
and full stalls.
The practice of impending stalls is of particular
value in developing the pilot’s sense of
feel for executing maneuvers in which maximum
airplane performance is required. These maneuvers
require flight in which the airplane approaches
a stall, but the pilot initiates recovery at
the first indication, such as by a stall warning
device activation.
Impending stalls may be entered and performed
in the same attitudes and configurations as
the full stalls or other maneuvers described
in this chapter. However, instead of allowing
the airplane to reach the critical AOA, the
pilot must immediately reduce AOA once the stall
warning device goes off, if installed, or recognizes
other cues such as buffeting. Hold the nose
down control input as required to eliminate
the stall warning. Then level the wings maintain
coordinated flight, and then apply whatever
additional power is necessary to return to the
desired flightpath. The pilot will have recovered
once the airplane has returned to the desired
flightpath with sufficient airspeed and adequate
flight control effectiveness and no stall warning.
Performance of the impending stall maneuver
is unsatisfactory if a full stall occurs, if
an excessively low pitch attitude is attained,
or if the pilot fails to take timely action
to avoid excessive airspeed, excessive loss
of altitude, or a spin.
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