NITROGEN PRESSURE
SUPPLY REGULATOR
PRESSURE
C
Zero Duct Pressure. The BLEED TRIP OFF Light Did Not Come On.
The Engine Was the Bleed Source.
Figure 106 (Sheet 5)

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
SEE D
SENSE LINE PRECOOLER
TO 450`F THERMOSTAT
SUPPLY PRESSURE
SENSE LINE TO
BLEED AIR REGULATOR

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

Zero Duct Pressure. The BLEED TRIP OFF Light Did Not Come On.
The Engine Was the Bleed Source.
Figure 106 (Sheet 6)

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A 737-300/400/500MAINTENANCE MANUAL
SEEE F
PRSOV
MS-6 (UNION) SENSE LINE TO 450`F THERMOSTAT
FWD
CAP
E
PRSOV
MS-6 (UNION)
FWD
CAP CONTROL PRESSURE SENSE LINE FROM BLEED AIR REGULATOR
F
Zero Duct Pressure. The BLEED TRIP OFF Light Did Not Come On.
The Engine Was the Bleed Source.
Figure 106 (Sheet 7)

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A 737-300/400/500MAINTENANCE MANUAL 
PREREQUISITES 
MAKE SURE THESE CIRCUIT BREAKERS ARE CLOSED (P6-4): B1,B2,B3,D1,D2,D3,D4 
OFF POSITION MAKE SURE THE AIRPLANE IS IN THIS CONFIGURATION: 201) APPLICABLE ENGINE BLEED SWITCH (P5 PANEL) IN THE NO PRESSURE IN THE PNEUMATIC SYSTEM (AMM 36-00-00/ ELECTRICAL POWER IS ON (AMM 24-22-00/201) 
THE BLEED VALVE WILL NOT CLOSE WHEN THE BLEED SWITCHES ARE TURNED OFF. THE ENGINE WAS THE BLEED SOURCE. . . . BE A PROBLEM WITH ONE OF THESE ITEMS: IF THE BLEED VALVE WILL NOT CLOSE, THERE CAN EQUIPMENT: 0-200 PSIG GAS SOURCE (NITROGEN BOTTLE) PRESSURE REGULATOR PRESSURE GAUGES (2 REQUIRED) MS-6 UNION FITTINGS (2 REQUIRED) ELECTRICAL SYSTEM. NOTE:____ PRSOV BLEED AIR REGULATOR 

NO YES
____IF THERE IS A PROB-
41 REMOVE THE PRESSURE FROM

1 OPEN THE FAN COWL PANEL
21 NOTE:
AND THRUST REVERSER HALVES LEM WITH THE BLEED THE SYSTEM.
(AMM 71-11-02/201). AIR REGULATOR OR REPLACE THE BLEED AIR

DISCONNECT THE 5TH-STAGE POWER IS NOT REGULATOR (AMM 36-11-16/401). SUPPLY LINE AT THE INLET TO SUPPLIED TO THE THE TEE. BLEED AIR REGU-
CONNECT A SUPPLY PRESSURE LATOR, THE BLEED GAUGE (Ps), A PRESSURE REGU-VALVE MAY NOT LATOR, AND A NITROGEN SOURCE CLOSE. AT THE INLET TO THE TEE (SEE
PUT THE APPLICABLE BLEED
SHEET 2).
SWITCH TO THE OFF POSITION.
REMOVE THE CONTROL PRES-
DISCONNECT CONNECTOR D3064
SURE SENSE LINE AT THE TEE ON
FROM THE BLEED AIR REGULATOR.
THE PRSOV. INSTALL A CONTROL
MEASURE THE VOLTAGE FROM
PRESSURE GAUGE (Pc) AT THE TEE
PIN 6 TO PIN 7 ON CONNECTOR
ON THE PRSOV TO MONITOR THE D3064.
CONTROL PRESSURE FROM THE
IS THERE 28V DC?
BLEED AIR REGULATOR (SEE SHEET 3).
NO PUT THE APPLICABLE BLEED SWITCH TO THE ON POSITION
42 EXAMINE THE CIRCUIT AS(P5 PANEL). NECESSARY (WDM 36-10-01). INCREASE Ps TO 60-70 PSIG. REPAIR THE PROBLEMS THAT YOU FIND.
NOTE: Pc SHOULD SHOW PRES-SURE ABOVE 20 PSIG. YES
PUT THE APPLICABLE BLEED
43 REMOVE THE PRESSURE FROM SWITCH TO THE OFF POSITION THE SYSTEM.(P5 PANEL). REPLACE THE PRSOV
　
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