SECTION IV. SPECIAL PROCEDURES
General. This section contains the special procedures
that were referenced in section II.
*A. Pressurization and Oxygen System. Check as
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
a. Cabin pressurization leak rate - Check with-
in limits as follows:
b. Level off aircraft when pressure differential
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.