TM 55-1510-215-CL
PROPELLER AUTOFEATHER SYSTEM
1.
Power levers - IDLE.
2.
Autofeather test switch - TEST. Check AUTOFEATHER
lights do not illuminate. If switch is held in TEST position,
propellers will gradually feather.
3.
Power levers - Advance to 500 ft-lb torque.
4.
Autofeather test switch - TEST. Hold to test position and
check both AUTOFEATHER lights illuminated; retard one
power lever. At 350 to 450 ft-lb torque, check opposite
AUTOFEATHER light extinguished. At 160 to 290 ft-lb
torque, check both AUTOFEATHER lights extinguished;
check propeller starts to feather.
5.
Power lever - Return to 500 ft-lb torque.
6.
Repeat steps 4 and 5 using the other power lever.
7.
Propeller autofeather test switch - ARM.
8.
Both power levers - Advance to 88% to 92% N (observe
1
ITT and torque limits). Check both AUTOFEATHER lights
illuminated. Retard each power lever individually below 88%
to 92% N1.
Check both AUTOFEATHER lights
extinguished.
OVERSPEED GOVERNOR
Check by setting RPM to 2100. Hold PROP GOV TEST switches UP. RPM
should decrease TO 1980 to 2060. Release test switches. RPM should return
to 2100.
P-5 C 4
