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required.
Condition: Automatic pressurization mode has failed 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 . . . . . . . . . . . .ALTN
Verify AUTO FAIL light extinguishes.
If the AUTO FAIL light remains illuminated or the ALTN
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.
AUTO FAIL/UNSCHEDULED
PRESSURIZATION CHANGE - DCPCS
June 3, 2005
737 Flight Crew Operations Manual
Copyright © The Boeing Company. See title page for details.
 2.3
2.3
Condition: Automatic pressurization mode has failed 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.
AUTO FAIL/UNSCHEDULED
PRESSURIZATION CHANGE - CPCS
June 3, 2005
737 Flight Crew Operations Manual
Copyright © The Boeing Company. See title page for details.

2.4
2.4
Condition: The BLEED TRIP OFF light illuminated indicates the
related engine bleed air temperature or pressure is
excessive.
WING ANTI-ICE SWITCH . . . . . . . . . . . . . . . . . . . . . . . . . . .OFF
TRIP RESET SWITCH. . . . . . . . . . . . . . . . . . . . . . . . . . . . PUSH
[The BLEED TRIP OFF light extinguishes if bleed air temperature has
cooled below limits.]
If the BLEED TRIP OFF light remains illuminated:
PACK SWITCH (affected side) . . . . . . . . . . . . . . . . . . . .OFF
[Causes operating pack to regulate to high flow in flight with flaps up.]
Avoid icing conditions.
If the BLEED TRIP OFF light extinguishes:
WING ANTI-ICE . . . . . . . . . . . . . . . . . . . . . . . AS REQUIRED
CAUTION: Use of wing anti-ice above approximately
FL350 may cause bleed trip off and possible
loss of cabin pressure.
BLEED TRIP OFF
June 3, 2005
737 Flight Crew Operations Manual
Copyright © The Boeing Company. See title page for details.
 2.5
2.5
Condition: One or more of the following conditions:
• The cabin altitude warning horn sounds
• There is a rapid loss of cabin pressure with airplane altitude above 14,000
feet.
CABIN ALTITUDE WARNING OR
RAPID DEPRESSURIZATION
OXYGEN MASKS AND REGULATORS . . . . . . . . . . . ON, 100%
CREW COMMUNICATIONS . . . . . . . . . . . . . . . . . . ESTABLISH
PRESSURIZATION MODE SELECTOR . . . . . . . . . . . . . . . MAN
OUTFLOW VALVE SWITCH . . . . . . . . . . . . . . . . . . . . . . CLOSE
If pressurization is restored, continue manual operation
to maintain proper cabin altitude.
PASSENGER SIGNS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .ON
If cabin altitude is uncontrollable:
PASSENGER OXYGEN SWITCH. . . . . . . . . . . . . . . . . . . .ON
Activate passenger oxygen if cabin altitude exceeds or
is expected to exceed 14,000 feet.
EMERGENCY DESCENT . . . . . . . . . . . . . . . . . . . . . INITIATE
Accomplish the EMERGENCY DESCENT checklist if
the airplane is above 14,000 feet MSL and control of
cabin pressure is not possible, or cabin pressure is
lost.
June 3, 2005
737 Flight Crew Operations Manual
Copyright © The Boeing Company. See title page for details.
　
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