D. Procedure
 S 864-020
 (1)  Open these circuit breakers and attach DO-NOT-CLOSE tags:
 (a)  On the main power distribution panel, P6: 1) CAPT & OBS INPH 2) F/O INPH
 S 844-021
 (2) Release the pressure from the crew oxygen system (depressurize).
 CAUTION: DO NOT TIGHTEN THE VALVE MORE THAN THE GIVEN TORQUE.
_______
 DAMAGE TO THE VALVE CAN OCCUR.

 (a)  Close the shutoff valve on the crew oxygen cylinder with your hand.
 NOTE: When you tighten the valve by hand, it is
____ equivalent to a maximum torque of 25 pound-inches.
 (b)  
Set one of the mask regulators of the crew oxygen system to 100 percent emergency oxygen.

 (c)  
Move the test lever on the sliding control on the mask storage box and bleed the oxygen from the lines.

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A
737-300/400/500MAINTENANCE MANUAL
 S 034-022
 WARNING: YOU MUST LOOSEN THE FITTING CONNECTIONS SLOWLY OR HIGH
_______ TEMPERATURES CAN OCCUR. THIS CAN CAUSE A FIRE OR EXPLOSION AND INJURY TO PERSONS CAN OCCUR.
 (3)  
Disconnect the oxygen supply from the regulator.

 S 034-023

 (4)
Disconnect the microphone connector from the regulator.

 S 024-024

 (5)  
Remove the mask/regulator from the storage box.

 S 034-025

 (6)  
Install clean caps or plugs on the open fittings and the ports.

 S 434-026

 (7)  
You must use metal caps when the threads engage the connector fittings.

 S 434-027

 (8)  
Use new plastic caps when the threads on the metal caps do not engage the connector fittings.

 TASK 35-12-86-404-029
 5. Mask/Regulator Installation
___________________________
 A. General
 (1)  Read and obey the safety precautions and the general maintenance procedures before you do the maintenance (AMM 35-00-00/201).
 B. References
 (1)  
AMM 35-00-00/201, Oxygen

 (2)  
AMM 35-12-00/501, Flight Crew Oxygen System

 (3)  
AMM 35-12-85/201, Crew Oxygen Mask

 (4)  
AIPC 35-10-00 Fig. 2

 (5)  
WDM 23-51-01, 23-51-02, 23-51-03

 C. Access
 (1)  Location Zones
 101 Control Cabin (Left)
 102 Control Cabin (Right)

 D. Procedure
 S 434-031
 (1)  
Remove the protective caps or plugs.

 (2)  
Connect the microphone connector to the regulator.

 S 434-032
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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737-300/400/500MAINTENANCE MANUAL
 S 424-033
 (3)  Install the mask/regulator.
 (a)  Connect the oxygen supply to the regulator.
 S 864-034
 (4)  Pressurize the crew oxygen system.
 (a)  Put the mask regulator of the crew oxygen system back to N (normal).
 WARNING:_______YOU MUST OPEN THE VALVE SLOWLY. HIGH TEMPERATURES CAN OCCUR AND CAUSE A FIRE OR EXPLOSION. THIS CAN CAUSE DAMAGE TO EQUIPMENT AND INJURY TO PERSONS CAN OCCUR.
 CAUTION: DO NOT TIGHTEN THE VALVE MORE THAN THE
_______ GIVEN TORQUE. DAMAGE TO THE VALVE CAN OCCUR.
 (b)  
Slowly open the shutoff valve on the crew oxygen cylinder fully.

 (c)  
Do not tighten the valve more than 25 pound-inches (equivalent to finger-tight).

 (d)  
Close the valve 1/4-turn and keep the valve in this position with lockwire.

 NOTE: Use the 0.020 inch diameter copper lockwire
____ (AMM 20-10-44/401).
 S 864-035
 (5) Remove the DO-NOT-CLOSE tags and close these circuit breakers:
 (a)  On the main power distribution panel, P6: 1) CAPT & OBS INPH 2) F/O INPH
　
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