Intentional Feather While Airborne

CHAPTER SIX

T-34C CONTACT

Commencing the pullout too rapidly and/or too early, resulting in a secondary stall.

Not checking the oil pressure, late in adding power when level, and not reporting oil

pressure to the instructor.

Unintentionally placing the stick in the wrong position, either too far forward or aft.

Unintentionally placing the stick in neutral or slightly aft of neutral.

620.

INTENTIONAL FEATHER WHILE AIRBORNE

Description. The propeller will be feathered while airborne to demonstrate the actual

feathering characteristics compared with the simulated condition. This maneuver will not be

performed by the student.

General. In order to extend the aircraft glide during an actual engine failure (with torque

less than 205 ft-lbs.), the propeller may be feathered. This increases the blade angle to a

maximum pitch of +87.5, streamlining the propeller and thereby increasing glide range.

At 100 KIAS, the propeller will continue to turn at approximately 200-300 RPM irrespective of

engine operation. Throughout this maneuver, you must maintain a minimum of 5000 feet AGL

over a hard surface runway.

Procedure

Simulate feather. Trim the aircraft for 100-KIAS glide (torque at 205 ft-lbs.).

Note the rate of descent and nose attitude.

Reduce the PCL to idle. Note the deceleration and increased rate of descent.

Place the condition lever to feather. Note the acceleration effect and decreased rate of

descent.

Return the condition lever to full increase. Note the time it takes for the propeller to

return to governing range, and deceleration at flat pitch.

The maneuver is complete once the propeller is in normal operating range.

Common Errors. N/A

6-36 FLIGHT PROCEDURES