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Engine acceleration
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TM-1-1510-223-MTF Maintenance Test Flight Manual Army Model RC-12
Next
CABIN CLIMB indicator
TM 1-1510-223-MTF
PROCEDURE
TROUBLESHOOTING
REFERENCE
f.
Verify that AIR COND N1 LOW annunciator light
is extinguished with N1 above 62%.
g.
CABIN AIR MODE SELECT switch - AUTO.
* 8.
Pneumatics/Vacuum/Pressurization - Check as
follows:
a.
PNEUMATIC
PRESSURE
gage/GYRO
SUCTION gage - Check in green arcs.
b.
CABIN ALT controller - Set 500 feet lower than
field pressure altitude.
c.
Cabin pressurization RATE control - Set to
maximum.
d.
ENVIRO & PNEU BLEED AIR valve switches (2)
- ENVIRO & PNEU off.
e.
PNEUMATIC
PRESSURE
gage/GYRO
SUCTION gage - Check. Pressure should drop
to zero.
f.
BL  AIR  OFF
annunciators
(2)
-
Check
illuminated.
g.
BL  AIR  FAIL
annunciators
(2)
-
Check
illuminated.
h.
CABIN PRESS switch - TEST (hold).
i.
LEFT PNEU & ENVIRO BLEED AIR valve switch
- ON.
j.
L BL AIR OFF annunciator - Check extinguished.
k.
BL  AIR  FAIL
annunciators
(2)
-
Check
extinguished.
2-45

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