NO NO

2 PUT THE ISOLATION VALVE
22 OPEN BLEED AIR VALVESWITCH (P5 PANEL) IN THE CIRCUIT BREAKERS B1,B2 AND B3

CLOSED POSITION.ON THE P6-4 PANEL.
LOOK AT THE POSITION DISCONNECT CONNECTOR D398
INDICATOR ON THE ISOLATION AT THE ISOLATION VALVE.
VALVE. CLOSE BLEED AIR VALVE
IS THE POSITION INDICATOR CIRCUIT BREAKERS B1,B2 AND B3
FOR THE ISOLATION VALVE IN THE ON THE P6-4 PANEL.
CLOSED POSITION? MEASURE THE VOLTAGE FROM

PIN 2 TO PIN 3 ON CONNECTOR
YES
D398. IS THERE 115V AC?
YES

YES

43 THERE IS AN ELECTRICAL
PROBLEM THAT DOES NOT LET THE
POWER GET TO THE ISOLATION
VALVE.
EXAMINE AND REPAIR THE ELECTRICAL CIRCUIT AS NECES-SARY (WDM 36-10-01).

The Isolation Valve Does Not Open or Close Properly.
Figure 108 (Sheet 2)

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 ALL  ú
 ú  02  Page 145
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
B07028
A 737-300/400/500MAINTENANCE MANUAL
ISOLATION VALVE ACTUATOR
ELECTRICAL CONNECTOR,
SEE B D398
ISOLATION VALVE 
SEE  A  OVERHEAT DETECTOR 
LOOP 

ISOLATION  BONDING WIRE  CROSSOVER DUCT  FWD 
KEEL BEAM  VALVE 
STRUCTURE 
A

ELECTRICAL CONNECTION  POSITION INDICATOR 
ISOLATION VALVE ACTUATOR
B 

The Isolation Valve Does Not Open or Close Properly.
Figure 108 (Sheet 3)

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 36-11-05
 ALL  ú ú 02 Page 146 ú Nov 15/97
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
B66625
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) BOTH ENGINE BLEED AND PACK SWITCHES (P5 PANEL) IN THE OFF POSITION
EQUIPMENT: 0-200 PSIG GAS SOURCE (NITROGEN BOTTLE) PRESSURE REGULATOR PRESSURE GAUGES (2 REQUIRED) MS-6 UNION FITTINGS (3 REQUIRED) NEEDLE VALVE
____NOTE:  . SPLIT DUCT PRESSURE CAN BE CAUSED BY A 
PROBLEM WITH ONE OF THESE ITEMS: 
- PRESSURE INDICATION SYSTEM 
- LEAKY SENSE LINES 
- PRECOOLER CONTROL VALVE 
- PRECOOLER CONTROL VALVE SENSOR 
- PRSOV OR BLEED AIR REGULATOR (BAR) 
SPLIT DUCT PRESSURE.  - 450`F THERMOSTAT 
THE ENGINE WAS THE  .  THE BLEED SYSTEM MODULATES ENGINE PRESSURE 
BLEED SOURCE. TO THAT SHOWN ON FIG. 102. 

YES YES

1 NOTE: A PROBLEM WITH THE
21 REMOVE THE PNEUMATIC
41 REMOVE THE PNEUMATIC
DUCT PRESSURE PRESSURE FROM THE SYSTEM PRESSURE FROM THE SYSTEM
TRANSMITTER OR (AMM 36-05-00/201). (AMM 36-05-00/201).
INDICATOR CAN CAUSE REPLACE THE DUCT PRESSURE

REPLACE THE DUCT PRESSURE A SPLIT DUCT PRES-TRANSMITTER ON THE AFFECTEDINDICATOR ON THE P5 PANEL. SURE CONDITION. SIDE (AMM 36-21-11/401).
NO
SUPPLY PNEUMATIC PRESSURE ____MAKE SURE THE AMBIENT
NOTE: 42 REMOVE THE PNEUMATIC WITH BOTH ENGINES VENT ON THE DUCT PRES-PRESSURE FROM THE SYSTEM (AMM 36-05-00/201). SURE TRANSMITTER IS NOT (AMM 36-05-00/201).
PUT THE ISOLATION VALVE TO CAPPED. CONTINUE THE AIRPLANE THE OPEN POSITION (P5 PANEL).
IN SERVICE.
SUPPLY PNEUMATIC PRESSURE
RUN BOTH ENGINES AT IDLE
WITH BOTH ENGINES, AND WITH
THRUST SETTING AND AT 70% N1
THE ISOLATION VALVE OPENED.
THRUST SETTING, IF PERMITTED.
DOES THE SPLIT DUCT
IS THE DUCT PRESSURE SPLIT
PRESSURE CONDITION STILL
MORE THAN 10 PSI?

OCCUR?
NO

SEE SHEET 2
(BLOCK 2)

Split Duct Pressure. The Engine Was the Bleed Source.Figure 109 (Sheet 1)
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