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ENGINE RUNUP (CONT) - TM-55-1510-218-MTF0049
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TM-55-1510-218-MTF Maintenance Test Flight Manual Army Model C-12C C-12D and C-12F Aircraft
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ENGINE RUNUP (CONT) - TM-55-1510-218-MTF0051
TM 55-1510-218-MTF
PROCEDURE
TROUBLESH00TING
REFERENCE
ENGINE RUNUP (CONT)
i. Left bleed air valve switch
OPEN. Check L BL AIR OFF
and L&R BL AIR FAIL Iights
off and pneumatic pressure at
12 to 20 PSI.
j. Right bleed air valve switch -
OPEN.
k. Right bleed air off Iight - Check
extinguished.
*10. Pressurization system - Check as
follows:
a.
Condition
Ievers
-
HIGH
IDLE.
b. Bleed air valve switches (2) -
PNEU AND ENVIRO OFF.
c. Pneumatic pressure gage -
Check. Pressure should drop to
zero.
d.
Bleed  air  warning
lights
-
Check illuminated
NOTE
Setting either bleed air valve switch to the
PNEU AND ENVIRO OFF position will
cause the bleed air warning lights to extin-
guish.
e. Cabin altitude controller - Set
500 feet lower than field eleva-
tion.
f. Cabin pressurization rate con-
trol - Set to maximum.
2-40

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