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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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Pressurization and Oxygen System.
TM 55-1510-218-MTF
SECTION IV. SPECIAL PROCEDURES
General. This section contains the special procedures
that were referenced in section II.
*A. Pressurization and Oxygen System. Check as
follows:
1. Bleed air valve switches (2) - OPEN.
2. After takeoff - Establish a climb.
3. Cabin altimeter - After takeoff the cabin altime-
ter needle should stabilize at selected altitude
250 feet and the cabin differential pressure
needle should continue climbing. The cabin al-
timeter needle should remain at selected altitude
until the maximum pressure differential of 6.
0.1 is reached. At this point (approximately 16,
600 feet pressure altitude) the cabin altitude
should increase while the differential pressure
remains constant.
a. Cabin pressurization leak rate - Check with-
in limits as follows:
b. Level off aircraft when pressure differential
reaches 60.1.
c. Bleed air valve switches (2) - ENVIRO OFF.
* 4. Cabin rate-of-climb indicator - Read and record
cabin rate of climb. Cabin rate of climb (cabin
pressurization leak rate) should not exceed 2200
feet per minute.
5. Bleed air valve switches (2) - OPEN. Re-
establish 6.0.1 PSI cabin pressure differential,
6. Left bleed air valve switch - ENVIRO OFF.
* 7. Slowly retard the right power lever and record
the minimum N1 speed that the Right engine
must be operated at to maintain the cabin pres-
sure differential at 6.0+1. N1 should not exceed
85%. and the minimum desirable N1 is 80%.
8. Left bleed air valve switch - OPEN.
9. Right bleed air valve switch - ENVIRO OFF.
4-1

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