TM 55-1510-215-MTF
PROCEDURE
TROUBLESHOOTING
REFERENCE
ENGINE RUNUP (CONT)
f.
Both power levers Advance to 88-
92% N1 (observe ITT and torque
limits). Check both AUTOFEATHER
lights illuminated. Retard each power
lever individually below 88-92% N1.
Check both AUTOFEATHE R
lights extinguished.
*13. Overspeed governor - Check by
F1-6
setting RPM to 2100. Hold PROP GOV
TEST
switches
UP.
RPM
should
DECREASE TO 1980 - 2060. Release
test switches. RPM should return to
2100.
*14. Engine ice vanes (Pull to EXT) - Check
operation by observing drop in torque
reading,
verify
that
handle
remains
extended when released, then push to
RET.
*15. Primary governor - Check. Set 1900
F1-6
RPM with power levers. Retard propeller
levers to detent position. Check for 1725
- 1775 RPM then advance propeller lever
to HIGH RPM.
*16. Propeller low pitch blade angle -
E4
Check on one engine at a time as follows:
a.
Read the corrected propeller torque in
ft-lb at 2000 RPM from Propeller
Torque Chart (figure 1).
2-18
