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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G60916
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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G60510
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)
G60505
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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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