36-11-05
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9TH STAGE MANIFOLD
CONTROL PORT REDUCER AND O-RING
HIGH-STAGE
VALVE
ACTUATOR

9TH-STAGE MANIFOLD
HIGH-STAGE VALVE
A
737-300/400/500MAINTENANCE MANUAL
HIGH-STAGE VALVE
SEE H
HIGH PRESSURE 9TH-STAGE MANIFOLD
HIGH-STAGE VALVE
SEE I
FWD RIGHT SIDE
H
POSITION INDICATOR
HIGH-STAGE VALVE
I
Low Duct Pressure. The Engine Was the Bleed Source. Figure 104 (Sheet 11)
B66521
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A 737-300/400/500MAINTENANCE MANUAL
HIGH-STAGE REGULATOR
SEE J HIGH-STAGE REGULATOR
CONTROL PRESSURE 
SENSE LINE 
SUPPLY PRESSURE 
SENSE LINE 
TEST LINE 
SUPPLY PRESSURE 
GAUGE (Ps) 
FWD 
NITROGEN 
SUPPLY 
PRESSURE 
PRESSURE 
REGULATOR  J 
Low Duct Pressure.  The Engine Was the Bleed Source 
Figure 104 (Sheet 12)

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
HIGH-STAGE VALVE
SEE K
CONTROL PRESSURE 
LINE TO HIGH 
STAGE VALVE 
HIGH-STAGE 
REGULATOR 

HIGH-STAGE VALVE ACTUATOR 
VALVE POSITION INDICATOR  K HIGH-STAGE VALVE FWD 
Low Duct Pressure. The Engine Was the Bleed Source. Figure 104 (Sheet 13) 

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A
737-300/400/500MAINTENANCE MANUAL
HIGH-STAGE REGULATOR HIGH-STAGE
SEE L
REGULATOR
CONTROL PRESSURE GAUGE (Pc)
CONTROL PRESSURE SENSE LINE  SUPPLY PRESSURE SENSE LINE 
TEST LINE 
GAUGE (Pc) SUPPLY PRESSURE 
FWD 
NITROGEN SUPPLY PRESSURE 
PRESSURE REGULATOR  L 
Low Duct Pressure. The Engine Was the Bleed Source. Figure 104 (Sheet 14)

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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
EQUIPMENT: 0-200 PSIG GAS SOURCE (NITROGEN BOTTLE) PRESSURE REGULATOR PRESSURE GAUGES (2 REQUIRED)MS-6 UNION FITTINGS (3 REQUIRED) NEEDLE VALVE
NOTE:____  . HIGH DUCT PRESSURE CAN BE CAUSED BY A PROBLEM 
WITH ONE OF THESE ITEMS: 
- PRESSURE INDICATION SYSTEM 
- PRSOV OR BLEED AIR REGULATOR (BAR)
HIGH DUCT PRESSURE. - LEAKY SENSE LINES. 
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 HIGH DUCT PRES-TRANSMITTER ON THE AFFECTEDINDICATOR ON THE P5 PANEL.SURE CONDITION. SIDE (AMM 36-21-11/401).
　
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