737 Flight Crew Operations Manual
2.15
Boeing Proprietary. Copyright © Boeing. May be subject to export restrictions under EAR. See title page for details.
D6-27370-4Q8-SJA
2.15
DUCT OVERHEAT
1 Temperature selector
(affected side) . . . . . . . . . . . . . . . . Select cooler
temperature
This prevents the air mix valves from returning
to an overheat condition.
2 TRIP RESET switch . . . . . . . . . . . . . . . . . . .Push
The DUCT OVERHEAT light extinguishes if the
duct temperature has cooled below limits.
3 Monitor duct temperature.
If the duct temperature increases rapidly or the
air mix valve moves towards full hot, set the
temperature selector to MANUAL. Adjust the air
mix valve position as needed.
■ ■ ■ ■
OFF - Equipmen t Cooling
1 EQUIP COOLING SUPPLY or EXHAUST
switch (affected side) . . . . . . . . . . . . ALTERNATE
2 No further action is necessary in flight if the
equipment cooling OFF light does not extinguish.
■ ■ ■ ■
DUCT
OVERHEAT
DUCT OVERHEAT
Condition:
A duct overheat occurs.
OFF
EQUIPMENT COOLING OFF
Condition:
The equipment cooling supply or exhaust fan
is failed.
Note: Illumination of the EQUIPMENT COOLING
OFF light may be an indication of a
pressurization problem. Ensure the
pressurization system is operating normally.
March 24, 2017
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