36-12-35
ALL ú ú 01 Page 504 ú Jul 15/93
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500
MAINTENANCE MANUAL
PRECOOLERCONTROL VALVE
SEE B
CONTROL PRESSURE LINE TO THE PRECOOLER CONTROL VALVE SENSOR
MS-6 (UNION)
CONTROL
PRESSURE
GAUGE (Pc)
TEST LINE NEEDLE VALVE
B
Precooler Control Valve Test Equipment Figure 501 (Sheet 2)
A54933
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36-12-35
ALL ú ú 01 Page 505 ú Jul 15/93
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
S 725-018
(9)
Slowly open the needle valve and reduce Pc until the precooler control valve goes to the fully open position.
S 725-019
(10)
Did the precooler control valve go to the fully open position at Pc above 3 psig?
(a)
No, replace the precooler control valve (AMM 36-12-35/401).
(b)
Yes, continue.
S 865-020
(11)
Decrease Ps to 0 psig.
S 085-021
(12)
Remove the nitrogen source, supply and control pressure gages, and test hoses.
G. Put the Airplane Back to Its Usual Condition
S 435-022
(1) Connect the pressure lines that were disconnected for this test.
S 415-023
WARNING: OBEY THE INSTRUCTIONS IN THE PROCEDURE TO CLOSE THE THRUST
_______ REVERSERS. IF YOU DO NOT OBEY THE INSTRUCTIONS, INJURIES TO PERSONS AND DAMAGE TO EQUIPMENT CAN OCCUR.
(2)
Close the thrust reversers (AMM 78-31-00/201).
(3)
Close the fan cowl panels (AMM 71-11-02/201).
S 445-025
(4)
Do the activation procedure for the thrust reverser
(AMM 78-31-00/201).
S 415-024
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36-12-35
ALL ú ú 01 Page 506 ú Jul 15/96
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
PRECOOLER CONTROL VALVE SENSOR - REMOVAL/INSTALLATION
_____________________________________________________
1. General_______
A. This procedure contains two tasks. The first task removes the sensor for the precooler control valve. The second task installs the sensor for the precooler control valve.
B. The sensor for the precooler control valve is found in the pneumatic duct downstream of the precooler. It is on the top aft right side of the strut. It is forward of the 450°F Thermostat on each engine.
TASK 36-12-45-004-001
2. Precooler Control Valve Sensor Removal______________________________________
A. References
(1) AMM 36-05-00/201, Pneumatic system
B. Access
(1)
Location Zones
507 Strut - Left Nacelle
508 Aft Strut Fairing - Left Nacelle
607 Strut - Right Nacelle
608 Aft Strut Fairing - Right Nacelle
(2)
Access Panels
5726L/5826R Access Door Strut
5729L/5829R Access Door Strut
C. Prepare to Remove the Sensor
S 864-002
WARNING: YOU MUST RELEASE THE PRESSURE IN THE PNEUMATIC DUCT BEFORE YOU
_______ REMOVE A PNEUMATIC SYSTEM COMPONENT. THE HOT HIGH PRESSURE AIR IN THE PNEUMATIC DUCTS CAN CAUSE INJURIES TO PERSONS OR DAMAGE TO EQUIPMENT.
(1)
Remove the pressure from the pneumatic system (AMM 36-05-00/201).
S 864-003
(2)
Open the BLEED AIR circuit breaker on the P6 Panel and attach a DO-NOT-CLOSE tag.
S 864-004
(3)
On the P5 Panel, attach a DO-NOT-OPERATE tag to the switches that follow:
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