C. Procedure
 S 914-074
 (1)  
Read and obey the safety precautions and general instructions before you do the maintenance (AMM 35-00-00/201).

 S 434-025

 (2)  
Remove all caps or plugs from the fittings and ports.

 (3)  
Connect the microphone connector to the stowage box.

 (4)  
Install the mask/regulator.

 (5)  
Move the lever on the regulator to N (normal).

 S 434-026
 S 424-027
 S 714-085
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747-400 MAINTENANCE MANUAL
 S 864-048
 WARNING:_______ OPEN THE SHUTOFF VALVE ON A CREW OXYGEN CYLINDER SLOWLY.  THE
 REMAINING OXYGEN CAN RELEASE WITH A LARGE FORCE.  THIS CAN
 CAUSE INJURY TO PERSONS AND DAMAGE TO THE AIRPLANE AND
 EQUIPMENT.
 CAUTION:_______ DO NOT TIGHTEN THE SHUTOFF VALVE ON THE CREW OXYGEN CYLINDER
 MORE THAN 25 POUND-INCHES.  THIS CAN CAUSE DAMAGE TO THE

 SHUTOFF VALVE.
 (6)  Open the shutoff valve on each applicable oxygen cylinder as follows:
 NOTE: Some airplanes have an optional second oxygen cylinder.
____
 (a)  Slowly turn the shutoff valve until it is fully open.
 NOTE: The shutoff valve can be turned by hand which is
____ equivalent to 25 pound-inches.
 (b)  
Close the shutoff valve one-fourth of a turn.

 (c)  
Install a lockwire on the shutoff valve.

 NOTE: Use the 0.020 inch diameter copper lockwire
____ (AMM 20-11-28/401).
 S 864-029
 (7)  Remove the DO-NOT-CLOSE tags and close these circuit breakers:
 (a)  P7 Overhead Circuit Breaker Panel 1) 7A20 CAPT INTERPHONE 2) 7A21 OBS INTERPHONE 3) 7A22 F/O INTERPHONE
 S 414-030
 (8)  
Put the mask/regulator in the stowage box (AMM 35-11-18/201).

 S 714-031

 (9)  
Do the operational test of the crew oxygen system (AMM 35-11-00/501).

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747-400 MAINTENANCE MANUAL
 MASK/REGULATOR AND STOWAGE BOX - INSPECTION/CHECK
_________________________________________________
 1.  General_______
 A.  This procedure includes these tasks:
 (1)  
Mask/Regulator Inspection

 (2)  
Smoke Goggles Inspection.

 B.  A stowage box and smoke goggles are installed at each crew station. Access is through the flight compartment.
 TASK 35-11-18-206-001
 2.  Mask/Regulator Inspection_________________________
 A.  References
 (1)  
AMM 35-00-00/201, Oxygen

 (2)  
AMM 35-11-18/201, Mask/Regulator and Stowage Box

 (3)  
AMM 35-11-18/401, Mask/Regulator and Stowage Box

 (4)  
IPC 35-11-18

 B.  Access
 (1)  Location Zone
 221 Control Cabin, Left
 222 Control Cabin, Right

 C.  Procedure
 S 916-009
 (1)  
Read and obey the safety precautions and general instructions before you do the maintenance (AMM 35-00-00/201).

 S 866-002

 (2)  
Remove the mask/regulator from the stowage box.

 S 216-003

 (3)  
Do a visual check of the mask, hoses, harness, regulator, cord, and microphone assembly:

 (a)  
Make sure the parts are clean: 1) Examine the parts for deterioration 2) Make sure there is no discoloration 3) Make sure the parts do not have cracks 4) Make sure the parts do not have more damage.

 (b)  
Make sure the fittings and connections are attached correctly.

 (c)  
Replace the mask, hose, regulator, or all parts that are not in satisfactory condition (AMM 35-11-18/401).
　
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