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 B.  The primary supply of pneumatic air is from the mid (5th) compressor stage of each engine, through a check valve (Fig. 1). When 5th-stage bleed air pressure is not high enough, high (9th) stage bleed air is used. Switching from mid to high stage bleed on each engine is controlled automatically by the high stage valve and regulator. The pressure regulating and shutoff valve (PRSOV) controls the pressure of air supplied to the precooler within the range of 34 and 50 psig. The high stage air is controlled to within the range between 25 and 33 psig by the high stage regulator. Air from either stage is routed through a precooler on each engine before entering the pneumatic manifold. The precooler control valve, controlled by a downstream temperature sensor, regulates manifold air temperature by controlling the amount of fan air flow through the precooler, as described in AMM 36-12-05/001.
 C.  The pneumatic manifold is separated into left and right sections by an isolation valve. A center section contains the APU duct. Flow of APU air into the center section is controlled by the APU bleed air valve. A ground service pneumatic connector is in the right section. Ground pneumatic sources bypass the pressure regulating valve and must have pressure regulation equipment.
 D.  Switches on the pilot's forward overhead panel control solenoids in the pneumatically operated bleed air regulators and APU bleed air valve. The engine fire switches, when actuated, cause the regulators and valve to close.
 E.  Normally the APU check valve prevents engine bleed pressure from backing into the APU bleed system. Should the check valve fail open, with the APU bleed valve open, engine bleed pressure could be detrimental to the APU. The DUAL BLEED light on the overhead panel illuminates when the APU bleed valve is open and either Engine No. 1 PRSOV or Engine No. 2 PRSOV and isolation valve are open. The light would be on during an APU engine start. After engine start and the APU bleed valve switch is placed to OFF, the light goes out indicating that the APU bleed valve has closed.
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 36-11-05
 ALL  ú ú 02 Page 1 ú Nov 15/93
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
PRECOOLER CONTROL

AND SHUTOFF VALVE (PRSOV)
LEFT VIEW
Engine Bleed Air Distribution System Component Location
Figure 1 (Sheet 1)

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 36-11-05
 ALL  ú ú 01 Page 2 ú Mar 15/94
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A55041
A 737-300/400/500MAINTENANCE MANUAL
PRECOOLER CONTROL 
VALVE SENSOR 
450`F THERMOSTAT OVERHEAT SWITCH 490`F  VALVE (PRSOV) REGULATOR PRESSURE AND SHUTOFF  HIGH-
STAGE 
REGULATOR 

FWD  9TH-STAGE MANIFOLD  VALVE STAGE HIGH  REGULATOR BLEED AIR 
RIGHT VIEW 

Engine Bleed Air Distribution System Component Location
Figure 1 (Sheet 2)

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 36-11-05
 ALL  ú ú 01 Page 3 ú Mar 15/94
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A55377
A

737-300/400/500
MAINTENANCE MANUAL

DUAL BLEED LIGHT (AMBER)
PNEUMATIC MANIFOLD ISOLATION VALVE
AIR CONDITIONING PACK SWITCH
BLEED SWITCH
FLIGHT COMPARTMENT

DUAL BLEED FULL OPEN RAM DOOR RAM DOOR FULL OPENA B B 
WING RESET 0 OFF ON 1 OFF HIGH PACK TRIP OFF WING-BODY OVERHEAT OFF ON 2 BLEED TRIP OFF PACK TRIP OFF WING-BODY OVERHEAT BLEED ANTI ICE WING ANTI ICE TRIP PSI 40 60 80 100 OFF TEST R PACKISOLATION VALVE CLOSE AUTO OPEN L PACK AUTO AUTO HIGH AUTO TRIP OFF BLEED OFF OVHT RECIRC FAN APU A A A A A A 
FAIL OFF SCHED DESCENT MANUALSTANDBYAUTO A A G G 

DUCT PRESSURE INDICATOR
BLEED TRIP OFF LIGHT (AMBER)
TRIP RESET
SWITCH

Engine Bleed Air Distribution Component Location
Figure 1 (Sheet 3)

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