SECTION IV. SPECIAL PROCEDURES
GENERAL. This section contains the special procedures that were
referenced in section II.
*A. PRESSURIZATION SYSTEM.
Check as follows:
Bleed air valve switches (2) - OPEN.
After takeoff- Establish a climb.
Cabin altimeter After takeoff the cabin altimeter needle should
stabilize at selected altitude ±
250 feet and the cabin
differential pressure needle should continue climbing. The
cabin altimeter 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
Cabin pressurization leak rate - Check within limits as follows:
Level off aircraft when pressure differential reaches
Bleed air valve switches (2) - ENVIRO OFF.
c. 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.
Bleed air valve switches (2) - OPEN. Reestablish 6.0±.1 PSI
cabin pressure differential.
Left bleed air valve switch - ENVIRO OFF.
Slowly retard the right power lever and record the minimum
N1 speed that the right engine must be operated at to maintain
the cabin pressure differential at 6.0±.1. N1 should not exceed
85%, and the minimum desirable N1 is 80%.
Left bleed air valve switch - OPEN.