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 TM 55-1510-218-MTF
PROCEDURE
TROUBLESHOOTING
REFERENCE
ENGINE RUNUP (CONT)
d. Turn generators on one at a
time to ensure that each gener-
ator comes on Iine.
e. Voltmeters must read within 1
volt of each other.
f. Load paralleling must be with-
in 1 increment on the load-
meter scale.
*12. Inverter volt-frequency meters -
C42-43
Check voltage between 110 and
120 volts and frequency between
390 and 410 Hz.
* 13. Autofeather system - Check as fol-
F4-15
lows:
a. Condition levers - LOW IDLE.
b. Autofeather switch - Hold to
TEST (ARM lights should re-
main extinguished).
c. Power levers - Advance to ap-
proximately 22% torque, then
move autofeather switch to test
mode. Both ARM lights should
illuminate.
d. Left power lever - Retard.
(1) 16 to 21% torque, check
right
AUTOFEATHER
light extinguished.
(2) At 9 to 14% torque, check
left AUTOFEATHER light
extinguished (propeller
starts to feather).
e. Left power lever - Set approxi-
mately 22% torque.
2-42
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