S 864-027
(13)
Pressurize the pneumatic system (AMM 36-05-00/201).
S 984-043
(14)
Open the isolation valve.
S 864-029
(15)
Put the applicable bleed switch to the ON position.
S 034-030
(16)
Disconnect the electrical connector from the bleed air regulator (AMM 36-11-16/401).
S 984-031
WARNING: PRESSURIZE THE BLEED AIR SYSTEM BEFORE YOU OPEN THE PRSOV.
_______ WHEN YOU OPEN THE PRSOV, USE A RACHET TYPE WRENCH. THE PRSOV CAN OPEN QUICKLY AND THIS CAN CAUSE THE HANDLE OF THE WRENCH TO TURN. THIS CAN CAUSE INJURIES TO PERSONS OR DAMAGE TO EQUIPMENT.
(17)
Manually open the pressure regulator and shutoff valve (PRSOV).
S 204-032
(18)
Do a check for leakage at the sense line connections on the
precooler control valve.
NOTE: No leakage is permitted at the sense line connections.
____
(a) If there is leakage, do the necessary repairs.
S 434-033
(19)
Connect the electrical connector to the bleed air regulator
(AMM 36-11-16/401).
S 864-042
(20)
Put the applicable bleed switch to the OFF position.
E. Put the Airplane to Its Usual Condition
S 864-035
(1)
Remove the pressure from the bleed air system (AMM 36-05-00/201).
(2)
Close the isolation valve.
S 984-036
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A
737-300/400/500MAINTENANCE MANUAL
S 434-037
WARNING:_______ OBEY THE INSTRUCTIONS IN THE PROCEDURE TO CLOSE THE THRUST
REVERSERS. IF YOU DO NOT OBEY THE INSTRUCTIONS WHEN YOU CLOSE
THE THRUST REVERSERS, INJURIES TO PERSONS OR DAMAGE TO
EQUIPMENT CAN OCCUR.
(3)
Close the thrust reversers (AMM 78-31-00/201). S 434-038
(4)
Close the fan cowl panel (AMM 71-11-04/201).
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36-12-35
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
PRECOOLER CONTROL VALVE - ADJUSTMENT/TEST
_________________________________________
1. General_______
A. This procedure contains a task to operationally check the precooler control valve. The procedure will check that the:
-Sense lines have no leaks
-Precooler control valve will operate satisfactorily.
TASK 36-12-35-705-001
2. Precooler Control Valve Operational Test________________________________________
A. Equipment
(1)
Nitrogen Source
(2)
Supply Pressure Gage - 0-200 PSIG
(3)
Control Pressure Gage - 0-60 PSIG
(4)
Pressure Regulator
(5)
Needle Valve
(6)
Union Fittings - MS-6 (2 required)
(7)
Test Line Hoses - 0-200 PSIG
B. Consumable Materials
(1) D00010 Antiseize Compound, commercially available
C. References
(1)
AMM 36-05-00/201, Pneumatic System
(2)
AMM 36-12-35/401, Precooler Control Valve
(3)
AMM 71-11-02/201, Fan Cowl Panels
(4)
AMM 78-31-00/201, Thrust Reverser System
D. Access
(1)
Location Zones 502/503 Fan Cowls - Left Nacelle 504/505 Thrust Reverser - Left Nacelle 602/603 Fan Cowls - Right Nacelle 604/605 Thrust Reverser - Right Nacelle
(2)
Access Panels 5737/5837 Fan Cowl Assembly 5738/5838 Thrust Reverser Cowl Assembly 5739/5839 Thrust Reverser Cowl Assembly 5746/5846 Fan Cowl Assembly
E. Prepare for the Operational Test
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