Continue climbing and ensure that the ALT WARN annunciator
light illuminates between 12,000 and 12,500 feet
CABIN PRESS DUMP 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 9,000 feet cabin altitude.
CABIN CONTROLLER RATE knob - Set to minimum. Monitor
the cabin rate of climb for a rate of less than 200 feet per
CABIN CONTROLLER RATE knob - Set 1 to 3 o'clock
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 climb for a rate of 1500 to 2500 feet per
Cabin altimeter - Check that the cabin altimeter needle stabilizes
and remains at -250 to +250 feet until the maximum differential
pressure of 6.5 +.I PSI is reached. At this point (approximately
15,300 feet pressure altitude), verify that cabin altitude
increases and differential pressure remains constant.
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 differential pressure.
Left ENVIRO & PNEU BLEED AIR switch - PNEU ONLY.
Slowly retard the right POWER lever to flight idle and determine
the minimum N. required to maintain cabin pressure. Verify that
cabin pressurization is maintained down to flight idle NI.
Left ENVIRO & PNEU BLEED AIR switch - ON.