36-11-05
ALL ú ú 01 Page 609 ú Jul 15/96
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
SENSE LINE 1 MANUAL WRENCHING DRIVE VISUAL POSITION INDICATOR
PRECOOLER CONTROL VALVE SENSOR PORT PRECOOLER CONTROL VALVE (LEFT SIDE)
TYPE A
PRESSURE HOSE
FWD
TYPE B
PORTABLE VALVE PRESSURE HOSE TEE FITTING
ACTUATING TEST SET
(EXAMPLE)
NEEDLE
VALVE
TYPE A PRESSURE HOSE
TEST SET FITTING NO. 6
TEST SET FITTING NO. 5 (REMOVED)
TEST SET
FITTING NO. 1
B1
NOT INSTALLED ON ALL AIRPLANES
Precooler Control Valve System Inspection/Check Figure 602 (Sheet 2)
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36-11-05
ALL ú ú 01 Page 610 ú Jul 15/93
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
S 716-038
(35)
Turn the Primary Regulator knob clockwise until (95.0 | 2.0) psig. is indicated on the Primary System Gauge.
S 716-039
(36)
Set the SYSTEM SELECTOR valve handle to the B position.
(a) Make sure the Precooler Control Valve position indicator is within 30° of the full-closed position.
S 716-040
(37) SLOWLY OPEN Test Set Shutoff Valve No. 2.
(a) Make sure Test Set Gauge No. 2 indicates (20.5 | 2.0) inches of Hg.
S 216-041
(38)
Read the complete TROUBLE SHOOTING TREE given below before you complete the test.
S 726-137
(39)
Very slowly open the needle valve and make sure the precooler control valve begins to open at minimum pressure of (16 +0,-1) inches of Hg. as indicated on Test Set Gauge No. 2.
(a)
If the precooler control valve does not begin to open at the above stated limit, replace the precooler control valve (AMM 36-12-35/401), then go to step G.(2).
(b)
If the precooler control valve begins to open at the above stated limit, continue to open the needle valve until the valve is in the full-open position. Make sure the valve is in the full-open position by (7.0) inches of Hg. as indicated on Test Set Gauge No. 2. 1) If the valve is at the full-open position by the above
stated limit, go to step G.(40).
2) If the valve is NOT at the full-open position by the above stated limit, replace the precooler control valve (AMM 36-12-25/401), then continue.
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36-11-05
ALL ú ú 01 Page 611 ú Jul 15/96
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
S 716-042
(40)
Set the SYSTEM SELECTOR handle to the OFF position.
S 036-043
(41)
Disconnect the TYPE A hoses from the Precooler Control Valve.
S 436-044
(42)
Connect the Precooler Control Valve supply pressure line.
S 436-045
(43)
Connect the Precooler Control Valve control pressure sense line.
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