35-12-21
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 S 864-021
 (6)  Remove DO-NOT-CLOSE tags and close this circuit breaker:
 (a)  P18 Circuit Breaker Panel
 1) OXYGEN SYSTEM IND

 S 844-022
 WARNING: VALVE MUST BE OPENED SLOWLY OR UNWANTED TEMPERATURES MAY OCCUR.
_______
 (7)  
Slowly open the shutoff valve of the crew cylinder.

 S 214-023

 (8)  
Make sure that the pressure indicator on aft overhead panel shows pressure.

 S 214-025

 (9)  
Use the leak detection compound to do a check for leaks on the connection between the pressure transducer and the cylinder coupling.

 S 364-026

 (10)
 If there is leakage:

 (a) Bleed the pressure of the crew oxygen system per par. 2.E.
 CAUTION: DO NOT USE THE TRANSDUCER BODY OR THE COUPLING BODY AS A
_______ LEVER. USE A WRENCH ON THE TRANSDUCER SQUARE BOSS AND ON THE COUPLING HEX NUT, OR DAMAGE TO COMPONENTS MAY OCCUR.
 (b)  
Tighten the transducer connection to a torque of 220
 pound-inches.

 (c)  
Do a check for leakage at the connection per steps 3.E.(8) and 3.E.(9).

 S 844-027
 (11) Remove electrical power if it is not necessary (AMM 24-22-00/201).
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 35-12-21
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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737-300/400/500MAINTENANCE MANUAL
 SYSTEM SHUTOFF VALVE - REMOVAL/INSTALLATION
___________________________________________
 1.  General________
 A. This procedure contains these tasks:
 (1)  
Removal of the system shutoff valve

 (2)  
Installation of the system shutoff valve.

 B. Access to the shutoff valve is available in the flight compartment.
 TASK 35-12-31-004-001
 2.  System Shutoff Valve Removal (Fig. 401)____________________________
 A. General
 (1)  Read the safety precautions and the general maintenance instructions of the oxygen system (Ref 35-00-00/201).
 B. Standard Tools and Equipment
 (1)  Caps or Plugs - Package of Clean Protective
 C. References
 (1)  
35-00-00/201, Oxygen

 (2)  
20-30-51/201, Maintenance Practices

 D. Access
 (1)  Location Zones
 102 Control Cabin, Right
 108 Forward Cargo Compartment

 E. Procedure
 S 844-002
 CAUTION:_______DO NOT TIGHTEN THE VALVE MORE THAN THE GIVEN TORQUE. DAMAGE TO THE VALVE CAN OCCUR.
 (1)  
In the forward cargo compartment, close the shutoff valve on the crew oxygen cylinder with your hand (equivalent to a torque of 25 pound-inches).

 S 034-003

 (2)  
In the control cabin, loosen the set screw on the knob of the oxygen system shutoff valve.

 (3)  
Remove the shutoff valve knob.

 S 014-005

 (4)  
Remove the insulation if it is necessary to get access to the shutoff valve area.

 S 014-006

 (5)  
To remove the trim panel, do the steps that follow:

 (a)  
Remove the equipment if it is necessary.

 (b)  
Remove the attachment screws of the trim panel.

 (c)  
Remove the trim panel.

 S 024-004
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 35-12-31
 ALL  ú ú 01 Page 401 ú Mar 15/96
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
SEE A
SCREWS (5 PLACES) TRIM PANEL ATTACHING  SCREWS (4 PLACES) ANGLE ATTACHING 
ANGLE 
CONNECTOR ELBOW SWIVEL  TRIM PANEL VALVE KNOB SHUTOFF (4 PLACES) SCREWS MOUNTING VALVE LINE (OUTLET) BSEE STRUCTURE DISTRIBUTION CREW OXYGEN 
　
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