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SUPPLY PNEUMATIC PRESSURENOTE: MAKE SURE THE AMBIENT WITH THE APU OR GROUND AIR VENT ON THE DUCT PRES-SOURCE (AMM 36-05-00/201). SURE TRANSMITTER IS NOT
PUT THE ISOLATION VALVE TO CAPPED. THE OPEN POSITION ON THE P5
 SUPPLY PNEUMATIC PRESSURE
PANEL (SEE SHEET 3, VIEW A).
WITH THE APU OR GROUND AIR
IS THE DUCT PRESSURE ON
SOURCE WITH THE ISOLATION
ONE SIDE MORE THAN 3 PSI VALVE OPENED.
HIGHER THAN THE OTHER SIDE?

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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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
B05359
A

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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 36-11-05
 ALL  ú ú 02 Page 131 ú Nov 15/97
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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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