C45365
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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
The Bleed Valve Will Not Close When the Bleed Switches Are Turned Off.
The Engine Was the Bleed Source.
Figure 107 (Sheet 2)
B03129
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
SEE B MS-6 (UNION) MS-6 (UNION)
PRECOOLER SUPPLY PRESSURE SENSE LINE TO BLEED AIR REGULATOR TO 450`F SENSE LINE THERMOSTAT
CONTROL PRESSURE GAUGE (Pc)
PRSOV
TEST LINE CONTROL PRESSURE SENSE LINE FROM BLEED AIR REGULATOR
B
The Bleed Valve Will Close When the Bleed Switches Are Turned Off.
The Engine Was the Bleed Source.
Figure 107 (Sheet 3)
C43845
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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
MAKE SURE THE AIRPLANE IS IN THIS CONFIGURATION: ELECTRICAL POWER IS ON (AMM 24-22-00/201) NO PRESSURE IN THE PNEUMATIC SYSTEM (AMM 36-00-00/
201) APPLICABLE ENGINE BLEED SWITCH (P5 PANEL) IN THE OFF POSITION
NOTE:____ WHEN THE ISOLATION VALVE SWITCH IS IN THE AUTO
POSITION, THE VALVE WILL BE IN THE CLOSED
POSITION UNLESS ONE OR MORE OF THESE FOUR
SWITCHES ARE IN THE OFF POSITION:
. LEFT PACK SWITCH
THE ISOLATION VALVE . RIGHT PACK SWITCH
DOES NOT OPEN OR . LEFT ENGINE BLEED SWITCH
CLOSE PROPERLY. . RIGHT ENGINE BLEED SWITCH.
NO
NO
1 PUT THE ISOLATION VALVE
21 OPEN BLEED AIR VALVE
41 THERE IS AN ELECTRICAL
SWITCH (P5 PANEL) IN THE OPEN CIRCUIT BREAKERS B1,B2, AND B3 PROBLEM THAT DOES NOT LET THE POSITION. ON THE P6-4 PANEL. POWER GET TO THE ISOLATION OPEN THE AIR CONDITIONING DISCONNECT CONNECTOR D398 VALVE. BAY DOOR. AT THE ISOLATION VALVE. EXAMINE AND REPAIR THE EXAMINE THE VALVE POSITION CLOSE BLEED AIR VALVEELECTRICAL CIRCUIT AS NECES-INDICATOR (SEE SHEET 3). CIRCUIT BREAKERS B1,B2, AND B3 SARY (WDM 36-11-01).
IS THE POSITION INDICATOR ON THE P6-4 PANEL. FOR THE ISOLATION VALVE IN THE MEASURE THE VOLTAGE FROM OPEN POSITION? PIN 1 TO PIN 3 ON CONNECTOR
D398.
YES
IS THERE 115V AC?
YES
SEE SHEET 2
(BLOCK 2)
The Isolation Valve Does Not Open or Close Properly.
Figure 108 (Sheet 1)
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B06971
A 737-300/400/500MAINTENANCE MANUAL
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