Spiral Demo

T-34C OUT-OF-CONTROL FLIGHT

CHAPTER TWO

vi.

Hold this attitude until the aircraft departs controlled flight, characterized by a

rapid roll to the left.

vii. IUT will assume control of the aircraft and recover in accordance with OCF

Recovery Procedures.

NOTE

The Standardization Instructor will raise the flap handle as the

aircraft departs.

CAUTION

Care must be taken not to overspeed the flaps and/or landing gear.

Spiral Demo

Discussion: This maneuver is demonstrated by the Standardization Instructor to

familiarize the IUT with the cockpit indications and flight characteristics of a spiral in

the T-34C. During the maneuver, the Standardization Instructor will execute Normal

Spin Entry Procedures up to the point of stall. Immediately after the stall, full rudder

and full back stick shall be applied. As the aircraft enters the post-stall gyration 3/4

(and up to full) aileron will be applied in the direction of spiral with stick slightly

forward of neutral. The aircraft will do a "Barrel Roll" type entry and initially "feel"

like a spin. Altitude, AOA, airspeed, and turn needle are scanned to differentiate

between a spin and a spiral and are called out by the IUT. Airspeed will continue to

build unless OCF Recovery Procedures are initiated. The Standardization Instructor

should maintain pro-spiral control inputs until the airspeed reaches at least 120 knots

(no greater than 150 knots) to allow the IUT ample opportunity to recognize the

aircraft is not in a Steady-State Spin. If the maneuver is performed to the left, the

AOA will be fully pegged (if performed to the right, AOA will indicate

approximately 20 units) and the turn needle pegged in the direction of rotation,

strongly resembling a Steady-State Spin. However, the airspeed will accelerate

rapidly through 80 - 100 knots. Minimum entry altitude for the Spiral Demo is 9000

feet AGL and OCF recovery will be initiated by 7000 feet AGL or 150 knots,

whichever occurs first. Test pilots have found that rates of descent associated with a

spiral can be as high as 27,000 fpm. The aircraft will typically recover within 1/4

turn, once OCF recovery inputs are initiated.

Procedures

Perform procedures to enter a normal erect spin to the left.

ii.

As the aircraft begins the "Barrel Roll" departure to the left, feed in 3/4 left

aileron and position stick slightly forward of neutral while maintaining full left

rudder deflection.

2-18 UNUSUAL ATTITUDES AND OUT-OF-CONTROL FLIGHT