737 Operations Manual
Non-Normal Checklists -
Air Systems
Copyright © The Boeing Company. See title page for details.
NNC.2.10 D6-27370-400E-TBCE
WING-BODY OVERHEAT
Condition: A WING-BODY OVERHEAT light illuminated indicates
a bleed air duct leak.
ISOLATION VALVE SWITCH . . . . . . . . . . . . . . . . . . . . . CLOSE
PACK SWITCH (affected side). . . . . . . . . . . . . . . . . . . . . . . OFF
[Causes operating pack to regulate to high flow in flight with flaps up.]
ENGINE BLEED AIR SWITCH (affected side) . . . . . . . . . . OFF
WING ANTI-ICE SWITCH . . . . . . . . . . . . . . . . . . . . . . . . . . . OFF
[Prevents possible asymmetrical ice buildup on the wings.]
Avoid icing conditions.
If the left WING-BODY OVERHEAT light remains illuminated:
APU BLEED AIR SWITCH (if APU running). . . . . . . . . .OFF
[Stops the flow of bleed air from the APU to the left side pneumatic
ducting.]
If the light remains illuminated:
APU SWITCH . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . OFF
Do not operate the APU.
If the light extinguishes:
ISOLATION VALVE SWITCH . . . . . . . . . . . . . . . AUTO
ENGINE No. 1 BLEED AIR SWITCH . . . . . . . . . . . .ON
LEFT PACK SWITCH . . . . . . . . . . . . . . . . . . . . . AUTO
WING ANTI-ICE SWITCH . . . . . . . . . . . AS REQUIRED
June 07, 2002
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