TM 1-1510-225-MTF
10. Climb - Continue. At between 12,000 and 12,500 feet
ALT WARN annunciator light will illuminate, oxy-
gen masks should drop, and cabin lights and no
smoking sign should illuminate.
11. CABIN PRESS switch - PRESS.
12. CABIN CONTROLLER - Set to 0 feet.
13. Climb - Continue to between 15,000 and 16,000 feet.
14. Cabin controller RATE knob - Set to 0 feet.
15. Cabin controller RATE knob - Set to maximum.
Monitor the cabin rate of climb for a descent rate of
less than 1500 to 2500 feet per minute.
16. Cabin controller RATE knob - Set to mid position.
Monitor the cabin rate of climb for a descent rate of
350 to 650 feet per minute.
17. Cabin controller RATE knob - Set to minimum.
Monitor the cabin rate of climb for a descent rate of
50 to 300 feet per minute.
18. Cabin altimeter - Check that the cabin altimeter
needle stabilizes and remains at -250 to +250 feet
until the maximum differential pressure of 6.5 ±.1
PSI is reached. At this point (approximately 15,300
feet pressure altitude), verify that cabin altitude
increases and differential presure remains constant.
19. With the cabin at maximum differential pressure,
place both BLEED AIR VALVES switches to
ENVIR OFF. As the cabin differential pressure
decreases from 6.1 to 5.7 PSI, the cabin rate of climb
shall not exceed 2200 feet per minute.
20. BLEED AIR VALVES switches - OPEN and
re-establish maximum differential pressure.
21. Left BLEED AIR VALVES switch - ENVIR OFF.
22. Slowly retard the right POWER lever to flight idle
and determine the minimum N1 required to maintain
cabin pressure. Verify that cabin pressurization is
maintained down to flight idle N1..
23. Left BLEED AIR VALVES switch - OPEN.
24. Right BLEED AIR VALVES switch - ENVIR OFF.
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