DOES THE HIGH DUCT PRES-NO
SURE CONDITION STILL OCCUR?
NO
SEE SHEET 2
42 REMOVE THE PNEUMATIC (BLOCK 2)
PRESSURE FROM THE SYSTEM (AMM 36-05-00/201). CONTINUE THE AIRPLANE IN SERVICE.
High Duct Pressure. The Engine Was the Bleed Source.
Figure 105 (Sheet 1)
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B05359
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737-300/400/500MAINTENANCE MANUAL
FROM SHEET 1 (BLOCK 1)
NO
YES
____A LEAK IN THE DOWN-
43 REMOVE THE PNEUMATIC
2
NOTE: STREAM LINE TO THE PRESSURE FROM THE SYSTEM PRSOV CAN CAUSE A (AMM 36-05-00/201). HIGH DUCT PRESSURE REPAIR ALL LEAKS. CONDITION.
EXAMINE THE SENSE LINE TUBING FROM THE DOWNSTREAMSENSE PORT OF THE PRSOV TO THE PRECOOLER (SEE SHEET 3, VIEW B).
IS THERE ANY LEAKAGE?
NO NO
3 REMOVE THE PNEUMATIC
PRESSURE FROM THE SYSTEM
(AMM 36-05-00/2O1).
USE A WRENCH TO OPEN AND CLOSE THE PRSOV.
DOES THE PRSOV MOVE TO THE OPEN AND CLOSE POSITIONSSMOOTHLY?
YES NO
4 CONNECT A SUPPLY PRESSURE
GAUGE (Ps), PRESSURE REGULA-TOR, AND NITROGEN BOTTLE TO
THE SUPPLY PRESSURE INLET LINE
AT THE TEE FROM THE 5TH-STAGE
DUCT (SEE SHEET 4).
REMOVE THE CONTROL PRESSURE LINE AT THE TEE ONTHE PRSOV (SEE SHEET 5).
INSTALL A CONTROL PRESSURE GAUGE (Pc) TO THE PRESSURELINE (SEE SHEET 5).
PUT THE BLEED SWITCH TO
THE ON POSITION (P5 PANEL). INCREASE Ps TO 50-60 PSIG. WAS Pc BELOW 28 PSIG?
YES
High Duct Pressure. The Engine Was the Bleed Source.
Figure 105 (Sheet 2)
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C45351
A
737-300/400/500
MAINTENANCE MANUAL
DUCT PRESSURE INDICATOR DUAL BLEED FULL OPEN RAM DOOR OFF RAM DOOR FULL OPEN RECIRC FAN
SEE A AUTO
40 60 80 OVHT
0 PSI 100 TEST
BLEED AIR ISOLATION VALVE OFF HIGH L PACK AUTO ISOLATION VALVE CLOSE AUTO R PACK AUTO HIGH OFF
WING ANTI ICE PACK TRIP OFF OVERHEAT BLEED TRIP OFF OFF WING-BODY RESET TRIP OPEN PACK TRIP OFF WING-BODY OVERHEAT BLEED TRIP OFF OFF WING ANTI ICE OFF LIGHT BLEED TRIP
FLIGHT COMPARTMENT 1 ON APU BLEED ON 2
FAIL AUTO OFF SCHED DESCENT STANDBY MANUAL
TRIP RESET
BUTTON
A
CONTROL
PRESSURE
PRESSURE REGULATING
AND SHUTOFF VALVE
(PRSOV) TO THERMOSTAT
SEE B
PRESSURE REGULATING
AND SHUTOFF VALVE
(PRSOV)
DOWNSTREAM SENSE LINE TO THE PRECOOLER
MANUAL CONTROL AND INDICATION
B
High Duct Pressure. The Engine Was the Bleed Source. Figure 105 (Sheet 3)
A99796
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A 737-300/400/500MAINTENANCE MANUAL
SEE C 5TH-STAGE SUPPLY LINE THE PRECOOLER SUPPLY LINE TO CONTROL VALVE
MS-6 (UNION) SUPPLY LINE AIR REGULATOR TO THE BLEED
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