737 Operations Manual
Non-Normal Checklists -
Air Systems
Copyright © The Boeing Company. See title page for details.
D6-27370-400E-TBCE NNC.2.11
ZONE TEMP/DUCT OVERHEAT
Condition: The (737-400) ZONE TEMP/(737-300/500) DUCT
OVERHEAT light illuminated indicates air
temperature in the related duct has exceeded limits or
also (737-400) that control of the flight deck trim air
modulating valve has been lost.
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.]
(737-400) If supply duct temperature increases rapidly:
TRIM AIR SWITCH . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .OFF
(737-300/500) 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.
June 07, 2002
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