Power Off Stall (POS) -Cont.

T-34C CONTACT

CHAPTER SIX

General. This stall might occur while you are descending in an actual or simulated

emergency or in any power-off situation when airspeed is not controlled. Recovery is made with

power off so that you will become proficient in recovering from a stall without power.

Enter this stall maneuver smoothly and without rushing to avoid over-controlling. The entry

glide simulates an actual flight condition and also provides a "measure" for the student pilot to

use in establishing the proper recovery attitude. Since the recovery is effected without power,

you cannot rely on thrust to "pull" you out of the stalled condition. You must utilize the force of

gravity to enable the aircraft to regain flying speed.

Procedures

CONFIGURATION: Position the aircraft at an appropriate altitude; in slow cruise

and the clean configuration.

CHECKLIST: Perform the Stall Checklist aloud to your instructor.

CLEARING TURN: Commence clearing turn using 45 angle of bank.

Roll wings level, then reduce the PCL to 200 ft-lbs. and adjust the nose attitude to

maintain altitude. Approaching 100 KIAS, set the 100-KIAS glide attitude (horizon

bisecting the windscreen). Retrim.

Once established in a 100-KIAS descent, smoothly raise the nose to a position 12-15

degrees above the normal cruise attitude by visually placing the exhaust stacks on the

horizon. Maintain this attitude with the wings level and the aircraft in balanced flight.

As the airspeed diminishes it will be necessary to increase backstick pressure

gradually in order to maintain nose attitude. Maintain heading with rudder. The stall

is recognized by airframe buffet and the nose pitching down slightly.

At the stall, decrease the angle of attack by releasing backstick pressure and allow the

nose to fall slightly below the 100-KIAS gliding attitude. Stop any rolling tendency

with rudder pressure applied opposite to the direction of roll and, as soon as aileron

effectiveness has been regained, smoothly level the wings with coordinated rudder

and ailerons. Hold the recovery attitude in balanced flight to permit the airspeed to

build up and as airspeed approaches 100 KIAS, raise the nose to resume the 100-

KIAS power-off attitude. The maneuver is complete when reestablished in the 100-

KIAS glide.

Common Errors

Lowering the nose too far, resulting in excessive loss of altitude.

Not trimming for 100-KIAS glide.

Not maintaining altitude during the clearing turn.

Early recovery resulting in secondary stall.

FLIGHT PROCEDURES 6-25