PROPELLER AUTOFEATHER SYSTEM
Power levers - IDLE.
Autofeather test switch - TEST. Check AUTOFEATHER
lights do not illuminate. If switch is held in TEST position,
Power levers - Advance to 500 ft-lb torque.
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.
Power lever - Return to 500 ft-lb torque.
Repeat steps 4 and 5 using the other power lever.
Both power levers - Advance to 88% to 92% N (observe
ITT and torque limits). Check both AUTOFEATHER lights
illuminated. Retard each power lever individually below 88%
to 92% N1.
Check both AUTOFEATHER lights
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
P-5 C 4