S 216-141
(39)
Examine the position indicator on the PRSOV.
(a)
If the position indicator is NOT in the full-open position, replace the PRSOV (AMM 36-11-15/401), the go to step H.(40).
(b)
If the position indicator is in the full-open position, continue.
S 716-083
(40)
Turn Pressure Regulator No. 1 counterclockwise until (0.0) psig is indicated on the No. 2 test set gauge.
S 716-084
(41)
Set the SYSTEM SELECTOR valve handle to the OFF position.
S 436-085
(42)
Install the MS21902-6 Union at the sense line fitting.
S 036-086
(43)
Disconnect the TYPE A hose from the Bleed Air Regulator supply pressure port.
S 436-087
(44)
Connect the TYPE A hose to the Union in the sense line.
(45)
Close the test set shutoff valves No. 2 and No. 3.
(46)
Set the SYSTEM SELECTOR handle to the A position.
S 716-090
(47)
Turn Pressure Regulator No. 1 clockwise until (24) psig. is indicated on the Test Set Gauge No. 3.
S 716-088
S 716-089
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36-11-05
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
S 216-091
(48) Examine the 450°F thermostat, sense lines and fittings for leakage.
(a) Replace or repair damaged items as necessary.
S 716-092
(49)
Turn Pressure Regulator No. 1 counterclockwise until (0.0) psig. is indicated on Test Set Gauges No. 2 and No. 3.
S 436-093
(50)
Connect all of the pressure lines disconnected in the test.
S 716-094
(51)
Put the test set back to its pre-test condition (i.e. all test fittings capped, primary regulator turned off).
S 726-095
(52)
Do the Engine Bleed Air Control System Operational Test (ENGINE) (Ref 36-11-05/501).
I. Examine the High Stage Valve and High Stage Regulator
S 036-096
(1)
Remove the cap from the test set fitting No. 4.
S 436-097
(2)
Install MS21902-6 Union in the control pressure line.
S 436-098
(3)
Connect -6 end of TYPE A hose to the Union at the control pressure line.
S 436-099
(4)
Connect the -4 end of the TYPE A hose to the No. 4 test set fitting. (See Fig. 604 Sheet 1)
S 716-100
(5)
Turn the primary regulator until (50.0 | 5.0) psig is indicated on the primary gauge.
NOTE: Make sure all of the test set regulators are in the
____ minimum pressure position (i.e. turned to the counterclockwise position).
S 716-101
(6)
Set the SYSTEM SELECTOR handle to the A position.
S 716-102
(7)
Turn the No. 1 pressure regulators clockwise until (18.0 | 1.0) psig. is indicated on test set gauge No. 3.
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
HIGH STAGE
REGULATOR
SEE A
HIGH STAGE
REGULATOR
HIGH STAGE VALVE
PORTABLE VALVE
ACTUATING UNION
TEST SET
(EXAMPLE) CONTROL
PRESSURE LINE
SUPPLY
VISUAL PRESSURE
HIGH STAGE POSITION LINE
VALVE INDICATOR
A
