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and shutoff valve. This would cause the 9th stage valve to close. Therefore, the
APU bleed air valve must be closed during ground use of engine anti-ice to
ensure that sufficient engine bleed air is available for cowl anti-icing.
Dual Bleed Light
The DUAL BLEED light illuminates whenever the APU bleed air valve is open and
the position of the engine bleed air switches and isolation valve would permit
possible backpressure of the APU. Therefore, thrust must be limited to idle
with the DUAL BLEED light illuminated.
AIR SYSTEMS
Sec. 6.2 Page 4 737
Rev. 11/15/02 #41 Continental Flight Manual
>>@ BLEED AIR SYSTEM SCHEMATIC
AIR SYSTEMS
737 Sec. 6.2 Page 5
Flight Manual Continental Rev. 11/15/02 #41
BCD BLEED AIR SYSTEM SCHEMATIC
AIR SYSTEMS
Sec. 6.2 Page 6 737
Rev. 11/15/02 #41 Continental Flight Manual
Wing-Body Overheat
A wing-body overheat condition is caused by a bleed air duct leak. It is sensed
by the overheat sensors located as shown.
Wing-Body Overheat Ducts And Lights
AIR SYSTEMS
737 Sec. 6.2 Page 7
Flight Manual Continental Rev. 11/15/02 #41
>>@B Bleed Air Controls And Indicators
AIR SYSTEMS
Sec. 6.2 Page 8 737
Rev. 11/15/02 #41 Continental Flight Manual
CD Bleed Air Controls And Indicators
AIR SYSTEMS
737 Sec. 6.2 Page 9
Flight Manual Continental Rev. 11/15/02 #41
< DUAL BLEED Light
Illuminated (amber) – APU bleed air valve open and engine No. 1 BLEED
air switch ON, or engine No. 2 BLEED air switch ON, APU bleed air valve
and isolation valve open.
= ISOLATION VALVE Switch
CLOSE – Closes isolation valve.
AUTO –
· Closes isolation valve if both engine BLEED air switches are ON and
both air conditioning PACK switches are AUTO or HIGH.
· Opens isolation valve automatically if either engine BLEED air or air
conditioning PACK switch positioned OFF.
OPEN – Opens isolation valve.
> 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.
? Engine BLEED Air Switches
OFF – Closes engine bleed air valve.
ON – Opens engine bleed air valve when engines are operating.
@ APU BLEED Air Switch
OFF – Closes APU bleed air valve.
ON – Opens APU bleed air valve when APU is operating.
A Bleed Air DUCT PRESSURE Indicator
Indicates pressure in L and R (left and right) bleed air ducts.
AIR SYSTEMS
Sec. 6.2 Page 10 737
Rev. 11/15/02 #41 Continental Flight Manual
B Wing-Body Overheat (OVHT) TEST Switch
Push –
· Tests wing–body overheat detector circuits.
· Illuminates both WING-BODY OVERHEAT lights.
C BLEED TRIP OFF Light
Illuminated (amber) – Excessive engine bleed air temperature or pressure.
· Related engine bleed air valve closes automatically.
· Requires reset.
>>@B
D TRIP RESET Switch
Push (if fault condition is corrected) –
· Resets BLEED TRIP OFF, PACK TRIP OFF and DUCT OVERHEAT lights.
· Lights remain illuminated until reset.
CD
D TRIP RESET Switch
Push (if fault condition is corrected) –
· Resets BLEED TRIP OFF, PACK and ZONE TEMP lights.
· Related engine bleed valve opens, or related pack valve opens, or
related air mix valve opens.
· Lights remain illuminated until reset.
AIR SYSTEMS
737 Sec. 6.2 Page 11
Flight Manual Continental Rev. 11/15/02 #41
AIR CONDITIONING SYSTEM DESCRIPTION
INTRODUCTION
Conditioned air for the cabin comes from either the aircraft air conditioning
system or a preconditioned ground source. Air from the preconditioned ground
source enters the air conditioning system through the mix manifold.
The air conditioning system provides temperature controlled air by processing
bleed air from the engines, APU, or a ground air source in air conditioning
packs. Conditioned air from the left pack, upstream of the mix manifold, flows
directly to the flight deck. Excess air from the left pack, air from the right pack,
and air from the recirculation system is combined in the mix manifold. The
mixed air is then distributed through the left and right sidewall risers to the
passenger cabin.
AIR CONDITIONING PACK
The flow of bleed air from the bleed air duct through each air conditioning pack
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