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ENGINE RUNUP | Up
TM-1-1510-225-MTF Army Model C-12 Aircraft Manual | Next
BLEED AIR VALVES switches |
TM 1-1510-225-MTF
PROCEDURE
TROUBLESHOOTING
REFERENCE
*5. Engine acceleration from LOW to
HIGH IDLE - Check approximately 4
seconds.
E5,15-20
*6. Engine HIGH IDLE speed - Check 69
E2
to 71% N1.
*7. N1 speed switch (air conditioning) -
Check as follows:
(a) Right engine CONDITION lever
- LOW IDLE.
(b) Right engine PROP lever -
FEATHER.
(c) CABIN TEMP MODE switch -
MANUAL COOL.
(d) AIR COND N1 LOW annuncia-
tor light - Verify illuminated.
(e) Right engine CONDITION lever
- Advance to increase N1 to
between 57 and 63%.
(f) AIR COND N1 LOW annunciator
light - Verify extinguished, and
that air conditioning compressor
begins operating in 8 to 12 sec-
onds, as evidenced by a sustained
increase in ITT on the right
engine.
(g) CABIN TEMP MODE switch -
AUTO.
*8. Pneumatics/vacuum/pressurization -
Check as follows:
(a) PNEUMATIC PRESSURE gage/
GYRO SUCTION gage - Check
in green arcs.
(b) Cabin controller - Set 500 feet
lower than field pressure altitude.
2-29
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