Tuesday, February 10, 2009

Approaches To Stalls (Imminent Stalls)—Power-On Or Power-Off

An imminent stall is one in which the airplane is
approaching a stall but is not allowed to completely

stall. This stall maneuver is primarily for practice in
retaining (or regaining) full control of the airplane
immediately upon recognizing that it is almost in a stall
or that a stall is likely to occur if timely preventive
action is not taken.

The practice of these 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 with the
airplane approaching a stall, and recovery initiated
before a stall occurs. As in all maneuvers that involve
significant changes in altitude or direction, the pilot
must ensure that the area is clear of other air traffic
before executing the maneuver.

These stalls may be entered and performed in the
attitudes and with the same configuration of the basic
full stalls or other maneuvers described in this chapter.
However, instead of allowing a complete stall, when
the first buffeting or decay of control effectiveness is
noted, the angle of attack must be reduced immediately
by releasing the back-elevator pressure and applying
whatever additional power is necessary. Since the
airplane will not be completely stalled, the pitch
attitude needs to be decreased only to a point where
minimum controllable airspeed is attained or until
adequate control effectiveness is regained.

The pilot must promptly recognize the indication of a
stall and take timely, positive control action to prevent
a full stall. Performance 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.

No comments:

Post a Comment