737 Flight Crew Operations Manual
Air Systems -
Controls and Indicators
Boeing Proprietary. Copyright © Boeing. May be subject to export restrictions under EAR. See title page for details.
2.10.2 D6-27370-866-EGP
OPEN – opens isolation valve.
3 WING–BODY OVERHEAT Light
Illuminated (amber) –
• left light indicates overheat from bleed air duct leak in left engine strut,
left inboard wing leading edge, left air conditioning bay, keel beam or
APU bleed air duct
• right light indicates overheat from bleed air duct leak in right engine
strut, right inboard wing leading edge or right air conditioning bay.
4 Engine BLEED Air Switches
OFF – closes engine bleed air valve.
ON – opens engine bleed air valve when engines are operating.
5 APU BLEED Air Switch
OFF – closes APU bleed air valve.
ON – opens APU bleed air valve when APU is operating.
6 Bleed Air DUCT PRESSURE Indicator
Indicates pressure in L and R (left and right) bleed air ducts.
7 Wing–Body Overheat (OVHT) TEST Switch
Push –
• tests wing–body overheat detector circuits
• illuminates both WING–BODY OVERHEAT lights.
8 BLEED TRIP OFF Light
Illuminated (amber) – excessive engine bleed air temperature or pressure
• related engine bleed air valve closes automatically
•requires reset.
9 TRIP RESET Switch
Push (if fault condition is corrected) –
Lights remain illuminated until reset.
• resets BLEED TRIP OFF, PACK or ZONE TEMP lights
• related engine bleed air valve opens, or related pack valve opens, or
related trim air modulating valve opens
March 28, 2013
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