S 035-020

 (10)
 Disconnect the supply pressure sense line at the high-stage regulator (View A, Fig. 504).

 S 435-021

 (11)
 Connect a test line, a supply pressure gage (Ps) and a pressure regulator to the supply pressure port of the high-stage regulator.

 S 015-193

 (12)
 Disconnect the control pressure sense line at the high-stage regulator.

 S 485-194

 (13)
 Install a control pressure gauge (Pc) between the control pressure line and the port on the high-stage regulator.

 S 035-022

 (14)
 Disconnect the downstream pressure sense line at the high-stage regulator.

 S 435-023

 (15)
 Connect a test line, a downstream pressure gage (Pd) and pressure regulator to the downstream pressure port of the high-stage regulator.

 S 435-024

 (16)
 Connect the supply pressure test line and the downstream pressure test line to a tee and then to the line for the nitrogen source.

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A 737-300/400/500MAINTENANCE MANUAL
 S 215-052
 (17) Make sure that both pressure regulators (test equipment) are in the closed position.
 G. Do the Operational Test (Fig. 504)
 S 215-039
 (1)  
Check that the high-stage valve position indicator is in the closed position (View C, Fig. 504).

 S 785-025

 (2)  
Supply 60 psig to the pressure regulators from the nitrogen source.

 S 785-026

 (3)  
Slowly increase Ps to 20 psig.

 S 215-053

 (4)  
Check that the high-stage valve position indicator has moved to the open position (View C, Fig. 504).

 S 785-027

 (5)  
Slowly increase Pd to 25 psig.

 S 215-040

 (6)  
Check that the control pressure goes below 4.0 psig.

 S 725-041

 (7)  
Did the control pressure go below 4.0 psig?

 (a)  
No, replace the high-stage regulator (AMM 36-11-86/401).

 (b)  
Yes, continue.

 S 865-076
 (8)  
Decrease nitrogen source pressure to 0 psig.

 S 865-043

 (9)  
Decrease Pd to 0 psig.

 S 865-044

 (10)
 Decrease Ps to 0 psig.

 S 085-045

 (11)
 Remove the nitrogen source, pressure gages, pressure regulators, test hoses and accessories.

 H. Put the Airplane Back to its Usual Condition
 S 645-049
 (1)  Apply a thin layer of antiseize compound to the external threads of the pressure sense line couplings.
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A 737-300/400/500MAINTENANCE MANUAL 
HIGH-STAGE REGULATOR ASEE 
SENSE LINE PRESSURE DOWNSTREAM 
CONTROL GAUGE (Pc) PRESSURE  REGULATOR HIGH-STAGE MS-6 (UNION) 
DOWNSTREAM PRESSURE GAUGE (Pd)  TEST LINE CONTROL PRESSURE SENSE LINE PRESSURE SUPPLY GAUGE (Ps)  MS-6 (UNION) SUPPLY SENSE LINE PRESSURE 
REGULATOR PRESSURE DOWNSTREAM  SUPPLY REGULATOR PRESSURE  PRESSURE SUPPLY NITROGEN 
A 
Reverse Flow Check Operational Test Figure 504 (Sheet 1) 

E37068
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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 B
9TH-STAGE 9TH-STAGEMANIFOLD
　
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