Cruise: Cabin Altitude indicator.............................................................Reset Reset CAB ALT using the placard for flight altitude changes greater than 1000 feet. Before descent: Cabin Altitude indicator.................................................................Set CAB ALT - landing field elevation minus 200 feet Descent: Cabin Rate selector .................................................................. Adjust Maintain normal proportional descent rate (300-500 fpm.) After landing: FLT/GRD switch .........................................................................GRD
Manual Mode Operation
(Airplanes with CPCS) This condition is indicated by the cabin altitude, rate of climb, and differential pressure not responding to the standby mode inputs to the pressurization controller. The AUTO FAIL and/or STANDBY lights may be illuminated.
(Airplanes with DCPCS) Dual channel failure of the automatic system requires manual operation of cabin pressurization. This condition is indicated the AUTO FAIL, MASTER CAUTION and AIR COND annunciator illumination.
CAUTION: Switch actuation to the manual mode causes an immediate response by the outflow valve. Full range of motion of the outflow valve can take up to 20 seconds.
Pressurization mode selector...........................................................MAN
MANUAL light – illuminated
CABIN/FLIGHT ALTITUDE placard...........................................Check Determine the desired cabin altitude.
Copyright . The Boeing Company. See title page for details.
SP.2.6 December 1, 2000
Supplementary Procedures -Air Systems 737 Operations Manual
If a higher cabin altitude is desired:
Outflow valve switch (momentarily) ....................................... OPEN Verify the outflow valve position indicator moves right, cabin altitude climbs at the desired rate, and differential pressure decreases. Repeat as necessary.
If a lower cabin altitude is desired:
Outflow valve switch (momentarily) ..................................... CLOSE Verify the outflow valve position indicator moves left, cabin altitude descends at the desired rate, and differential pressure increases. Repeat as necessary.
During Descent
Thrust lever changes should be made as slowly as possible to prevent excessive pressure bumps.
Outflow valve switch (momentarily) ..................................... CLOSE During descent, intermittently position the outflow valve switch toward CLOSE, observing cabin altitude decrease as the airplane descends.
Before entering the landing pattern, slowly position the outflow valve to full open to depressurize the airplane. Verify differential pressure is zero.
Pressurization Control Operation – Landing at Alternate Airport
At top of descent:
CAB ALT indicator (as installed).................................................SET Set CAB ALT to new destination airport elevation minus 200 feet.
LAND ALT indicator .................................................................Reset Reset to new destination field elevation.
Supplementary Procedures -Air Systems 737 Operations Manual
Automatic Pressurization Control – Departure Airport Elevation Above 9500 Feet
Oxygen masks and regulators .............................................. ON, Normal Supplemental oxygen must be used when operating the airplane anytime the cabin altitude is above 10,000 feet.
After electrical power is applied to the airplane:
ALT HORN CUTOUT switch .................................................... Push Monitor CABIN altitude and CABIN rate of CLIMB indicators during climbout to ensure cabin altitude is descending below 8500 feet. No cabin altitude warning is provided until the cabin altitude warning system is reset to 10,000 feet after the cabin altitude descends below 8500 feet.
If landing altitude is at or below 6000 feet:
LAND ALT indicator ................................Destination field elevation
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