2.6
2.6
Condition: The DUAL BLEED light illuminated indicates the APU
bleed valve open and No. 1 engine BLEED air switch
ON, or No. 2 engine BLEED air switch ON with APU
bleed air valve and isolation valve open.
Limit engine thrust to idle while the light is illuminated.
After engine start:
APU BLEED AIR SWITCH . . . . . . . . . . . . . . . . . . . . . . . .OFF
Condition: The DUCT OVERHEAT light illuminated indicates air
temperature in the related duct has exceeded limits.
TEMPERATURE
SELECTOR . . . . . . . . . . . . . . . . . . . .COOLER TEMPERATURE
[Prevents the air mix valves from returning to an overheat condition.]
TRIP RESET SWITCH. . . . . . . . . . . . . . . . . . . . . . . . . . . . PUSH
[The DUCT OVERHEAT light extinguishes if the duct temperature has
cooled below limits.]
If duct temperature increases rapidly or the air mix valve
indicator moves toward full hot:
TEMPERATURE SELECTOR. . . . . . . . . . . . . . . . . .MANUAL
Adjust the air mix valve position as required.
DUAL BLEED
DUCT OVERHEAT
June 3, 2005
737 Flight Crew Operations Manual
Copyright © The Boeing Company. See title page for details.
 2.7
2.7
Condition: Unable to control cabin pressure with airplane above
14,000 feet MSL or conditions require a rapid descent.
SPEED BRAKE . . . . . . . . . . . . . . . . . . . . . . . . . DOWN DETENT
Smoothly lower the SPEED BRAKE lever and level off.
Add thrust and stabilize on altitude at desired airspeed.
CREW OXYGEN REGULATORS . . . . . . . . . . . . . . . . NORMAL
Flight crew must use oxygen when cabin altitude is
above 10,000 feet. To conserve oxygen, position the
NORMAL/100% selector to NORMAL.
ENGINE START SWITCHES. . . . . . . . . . . . . . . . AS REQUIRED
The new course of action is based on weather, oxygen, fuel
remaining and available airports. Use of long range cruise
may be appropriate.
EMERGENCY DESCENT
EMERGENCY DESCENT . . . . . . . . . . . . . . . . . . . . ANNOUNCE
The captain will advise the cabin crew, on the PA system,
of impending rapid descent. First officer will advise ATC
and obtain the area altimeter setting.
ENGINE START SWITCHES . . . . . . . . . . . . . . . . . . . . . . . . . .ON
THRUST LEVERS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . CLOSE
Reduce thrust to minimum or as required for anti-ice.
SPEED BRAKE . . . . . . . . . . . . . . . . . . . . . . . . FLIGHT DETENT
DESCENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . INITIATE
TARGET SPEED . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Mmo/Vmo
If structural integrity is in doubt, limit speed as much as
possible and avoid high maneuvering loads.
LEVEL-OFF ALTITUDE . . . . . . . . . . LOWEST SAFE ALTITUDE
OR 10,000 FT,
whichever is higher
June 3, 2005
737 Flight Crew Operations Manual
Copyright © The Boeing Company. See title page for details.

2.8
2.8
Condition: The Equipment Cooling Supply or Exhaust OFF light
illuminated indicates a loss of airflow from the
selected cooling fan.
EQUIPMENT COOLING SUPPLY/EXHAUST
SWITCH (as required) . . . . . . . . . . . . . . . . . . . . . .ALTERNATE
No further action is necessary in flight if the equipment
cooling OFF light does not extinguish.
Condition: The OFF SCHED DESCENT light illuminated indicates
the airplane descended before reaching the planned
cruise altitude set in the FLT ALT indicator.
No action is necessary if the airplane is returned to the
airport of departure for landing.
If not landing at airport of departure:
FLIGHT ALTITUDE INDICATOR . . . . . . . . . . . . . . . . RESET
Reset to actual airplane altitude.
EQUIPMENT COOLING OFF
OFF SCHEDULE DESCENT
June 3, 2005
737 Flight Crew Operations Manual
Copyright © The Boeing Company. See title page for details.
 2.9
2.9
Intentionally
Blank
June 3, 2005
737 Flight Crew Operations Manual
Copyright © The Boeing Company. See title page for details.

2.10
2.10
Condition: A PACK TRIP OFF light illuminated indicates the
related pack valve closed due to temperature
exceeded limits.
TEMPERATURE
SELECTOR . . . . . . . . . . . . . . . . . . . WARMER TEMPERATURE
[Reduces the work load on the affected air conditioning pack.]
TRIP RESET SWITCH. . . . . . . . . . . . . . . . . . . . . . . . . . . . PUSH
[The PACK TRIP OFF light extinguishes if the pack temperature has
cooled below limits.]
Continued on next page
PACK TRIP OFF - DCPCS AIRPLANES
June 3, 2005
737 Flight Crew Operations Manual
　
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