Continue climbing and ensure that the ALT WARN annunicator light
illuminates between 12, 000 and 12, 500 feet.
CABIN PRESS DUMB switch - OFF.
CABIN CONTROLLER - Set to 0 feet.
Continue climbing to between 15,000 and 16,000 feet. As the altitude
cabin descends to 0 feet, ensure that the ALT WARN annunciator
extinguishes prior to 9000 feet cabin altitude.
CABIN CONTROLLER RTE knob - Set to minimum. Monitor the cabin
rate of climb for a rate of less than 200 feet per minute.
CABIN CONTROLLER RATE knob - Set 1 to 3 oclock position. Monitor
the cabin rate of climb for a rate of 350 to 650 feet per minute.
CABIN CONTROLLER RATE knob - Set to maximum. Monitor the
cabin rate of 1500 to 2500 feet per minute.
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 pressure
With the cabin at maximum differential pressure, place both ENVIRO &
PNEU BLEED AIR switches to PNEU ONLY. 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.
ENVIRO & PNEU BLEED AIR switches - ON and re-establish maximum
Left ENVIRO & PNEU BLEED AIR switch - PNEU ONLY.
Slowly retard the right POWER lever to flight idle determine the minimum
N1 required to maintain cabin pressure. Verify that cabin pressurization is
maintained down to flight idle N1.
Left ENVIRO & PNEU BLEED AIR switch - ON.