737 Operations Manual
Non-Normal Checklists -
Unannunciated
Copyright © The Boeing Company. See title page for details.
D6-27370-400E-TBCE NNC.0.5
AUTO FAIL/UNSCHEDULED
PRESSURIZATION CHANGE
Condition: Automatic pressurization mode has failed, cabin
altitude warning horn sounds, or the cabin altitude is
not under control.
Increasing thrust may ensure adequate air supply to control
cabin altitude.
ENGINE BLEED AIR SWITCHES . . . . . . .ON (ONE AT A TIME)
PACK SWITCHES . . . . . . . . . . . . . . . . AUTO (ONE AT A TIME)
Allow cabin rate to stabilize before placing second switch
on.
If the AUTO FAIL light is illuminated or pressurization is not
under control:
PRESSURIZATION MODE SELECTOR. . . . . . . . . . . . .STBY
Verify AUTO FAIL light extinguishes. Set cabin altitude
using the cabin/flight altitude placard. Before descent,
set landing field elevation minus 200 feet.
If the AUTO FAIL light remains illuminated or the STBY
mode cannot maintain cabin pressurization:
PRESSURIZATION MODE SELECTOR . . . . . . . . . . MAN
OUTFLOW VALVE SWITCH . . . . . . . . . . . AS REQUIRED
Operate the outflow valve to maintain proper cabin
altitude and cabin rate of change.
At traffic pattern altitude, position the outflow valve
to full open.
CONFIGURATION WARNING
Condition: An intermittent warning horn sounds when advancing
thrust levers to takeoff, or a steady warning horn
sounds inflight.
Assure proper airplane configuration.
December 06, 2002
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