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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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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A
737-300/400/500MAINTENANCE MANUAL
HIGH-STAGE VALVE SEE B
9TH-STAGE 9TH-STAGEMANIFOLD
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