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TM-1-1510-223-MTF Maintenance Test Flight Manual Army Model RC-12
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CABIN CONTROLLER
TM 1-1510-223-MTF
SECTION IV. SPECIAL PROCEDURES
General. This section contains the special procedures that were
referenced in Section II.
1.
Before takeoff:
a.
CABIN CONTROLLER - Set for a 5000 foot cabin
altitude.
b.
CABIN CONTROLLER RATE knob - Set to the 1 to 3
o'clock position.
c.
ENVIRO & PNEU BLEED AIR valve switches (2) - ON.
d.
CABIN PRESS DUMP switch - OFF.
2.
After takeoff - Initiate a climb to 10,000 to 12,000 feet
pressure altitude.
3.
Cabin rate-of-climb indicator - Monitor for a smooth transition
from an unpressurized to a pressurized cabin.
4.
CABIN CONTROLLER RATE knob - Set to minimum.
Monitor the cabin rate of climb for a rate of less than 200 feet
per minute.
5.
CABIN CONTROLLER RATE knob - Set 1 to 3 o'clock
position. Monitor the cabin rate of climb for a rate of 350 to
650 feet per minute.
6.
CABIN CONTROLLER RATE knob - Set to maximum. Monitor
the cabin rate of climb for a rate of 1500 to 2500 feet per
minute.
7.
Cabin altimeter - Check that the cabin altimeter needle
stabilizes at 4600 to 5400 feet while the cabin differential
pressure needle continues to increase.
8.
CABIN CONTROLLER - Set to 10,000 feet.
9.
CABIN PRESS DUMP switch - DUMP, when cabin altitude
approaches aircraft altitude.
4-1

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