52 DECREASE Ps TO ZERO.
CONTINUE THE AIRPLANE IN SERVICE (SPURIOUS, INTERMIT-TENT OR CORRECTED FAULT).
Split Duct Pressure. The Engine Was the Bleed Source.
Figure 109 (Sheet 4)

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A 737-300/400/500MAINTENANCE MANUAL
SUPPLY LINE TO THE PRECOOLER CONTROL VALVE
SEE A
5TH-STAGE SUPPLY LINE
MS-6 (UNION) 
SUPPLY LINE 
TO THE BLEED 
AIR REGULATOR 
5TH-STAGE 
CHECK VALVE
SUPPLY 
PRESSURE 
GAUGE (Ps) 
TEST LINE  5TH-STAGE 
DUCT 
FWD 

NITROGEN
PRESSURE
SUPPLY
REGULATOR
PRESSURE
A

Split Duct Pressure. The Engine Was the Bleed Source.

Figure 109 (Sheet 5)

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A

737-300/400/500
MAINTENANCE MANUAL

PRECOOLER 
CONTROL VALVE
SEE  B 
CONTROL PRESSURE 
LINE TO THE 
PRECOOLER CONTROL 
VALVE SENSOR 
MS-6 (UNION) 

PRECOOLER CONTROL VALVE
CONTROL
PRESSURE
GAUGE (Pc)

TEST LINE NEEDLE VALVE
B
Split Duct Pressure. The Engine Was the Bleed Source. Figure 106 (Sheet 6)
G60513
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A
737-300/400/500MAINTENANCE MANUAL
SEE C
SENSE LINE PRECOOLER
TO 450`F THERMOSTAT
SUPPLY PRESSURE
SENSE LINE TO
BLEED AIR REGULATOR

CONTROL PRESSURE GAUGE (Pc)
PRSOV
MS-6 (UNION)
TEST LINE MS-6 (UNION)
CONTROL PRESSURE SENSE LINE FROM BLEED AIR REGULATOR
C

Split Duct Pressure. The Engine Was the Bleed Source.
Figure 109 (Sheet 7)

G60508
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A 737-300/400/500MAINTENANCE MANUAL
EDSEE VALVE (PRSOV) AND SHUTOFF PRESSURE REGULATING 
PRSOV 
450`F THERMOSTAT SENSE LINE TO 
FWD  D CAP 

PRSOV
FWD
CAP
CONTROL PRESSURE SENSE LINE FROM BLEED AIR REGULATOR
E
Split Duct Pressure. The Engine Was the Bleed Source. Figure 109 (Sheet 8)
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A
737-300/400/500MAINTENANCE MANUAL
 B.  Perform engine bleed air distribution system test (AMM 36-11-05/501) to isolate problems in the system. Then perform the procedures on the following trouble shooting chart to isolate subsystem and component faults.
 NOTE: Disregard fluctuation of the manifold gauge when operating
____ L or R bleed system with the isolation valve and respective air conditioning pack closed.
 C.  Engine bleed air precooler leakage has been eliminated as a possible fault since any leakage at the precooler great enough to cause system problems should be obvious.
　
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