C.  Procedure
 S 212-001
 (1)  
Make sure the oxygen mask harness and oxygen supply hose are not twisted.

 S 212-002

 (2)  
Make sure the foam padding on the oxygen mask is soft.

 S 212-003

 (3)  
Make sure the foam padding on the oxygen mask quickly moves back to the initial position when you push on the foam padding.

 S 162-004

 (4)
Remove any loose pieces of foam that you find in the face mask.

 S 212-005

 (5)  
Make sure the clips hold the oxygen hose to the bottom of the mask stowage box.

 S 422-006

 (6)  
Hold the mask and put the oxygen supply hose into coils. Push the hose down to get symmetrical coils.

 S 422-007

 (7)  
When most of the supply hose is put into coils, put two large spacers at the back of the oxygen mask harness.

 (8)  
Put the spacers carefully on the supply hose.

 S 422-008
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A 737-300/400/500MAINTENANCE MANUAL
MASK REGULATOR
PIN

Crew Oxygen Mask Packing Procedure
Figure 201

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A 737-300/400/500MAINTENANCE MANUAL
 S 422-009
 (9)  
Install the mask harness into the stowage box. Move the oxygen mask forward to help position the mask harness.

 S 212-010

 (10)
 Make sure the oxygen harness is on top of the supply hose.

 S 212-011

 (11)
 Make sure the tab on the front of the mask is on the horizontal plastic surface inside the stowage box.

 S 212-012

 (12)
 Make sure the first two spacers of the harness are on top of the mask face piece.

 S 212-013

 (13)
 Make sure the oxygen mask harness does not catch on the ON-OFF valve of the flow blinker when you close the mask stowage box.

 S 422-014

 (14)
 Put the supply hose at the center of the bottom of the mask stowage box.

 S 212-022

 (15)
 Make sure the disconnects on the oxygen supply hose do not touch the mask face seal.

 S 212-015

 (16)
 Make sure the dilution control is on 100% and the safety pressure button is on normal.

 S 412-016

 (17)
 Close the left lid of the mask stowage box.

 S 862-017

 (18)
 Move the RESET lever on the left lid and make sure the flag goes out of view.

 S 862-018

 (19)
 Engage the pin on the left lid in the hole on the left side of the mask regulator.

 (20)
 Close the right lid of the stowage box.

 S 412-019
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A
737-300/400/500MAINTENANCE MANUAL
 S 712-020
 (21) Do this task:  "Flight Crew Oxygen System Adjustment Test" (Ref 35-12-00/501).
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