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 TASK 35-22-31-004-001
 2.  PSU Oxygen Mask Removal_______________________
 A.  Standard Tools and Equipment
 (1)  Rod or Tool - 0.125 inch diameter
 B.  References
 (1)  
35-22-11/201, Oxygen

 (2)  
35-22-31/701, Oxygen

 C.  Access
 (1)  Location Zone
 100 Upper Half of the Fuselage

 D.  Procedure - Remove the Oxygen Masks
 S 044-003
 (1)  Deactivate the oxygen generator (Ref 35-22-11/201).
 S 034-058
 WARNING: WHEN YOU REMOVE AND INSTALL THE MASKS, DO NOT PULL THE
_______ LANYARDS. TOO MUCH PRESSURE ON THE RELEASE CABLE WILL RELEASE THE FIRING PIN AND FIRE THE GENERATOR. IF YOU PULL THE RELEASE PIN AND THE GENERATOR FIRES, THE GENERATOR TEMPERATURE CAN BE 450°F AND HIGHER. THESE HIGH SURFACE TEMPERATURES CAN CAUSE BAD BURNS. DO NOT TOUCH THE GENERATOR UNTIL IT IS COOL.
 (2)  Carefully pull the release pin from the generator firing pin (Fig. 401).
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 35-22-31
 ALL  ú ú 01 Page 401 ú Jul 15/96
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A

737-300/400/500
MAINTENANCE MANUAL

SEE A PASSENGER UNIT (PSU) SERVICE 
FWD 
PASSENGER COMPARTMENT 

MASK BOX
OXYGEN
SEE B
GENERATOR
FWD
PASSENGER SERVICE UNIT (PSU)A
Oxygen Mask Installation Figure 401 (Sheet 1)
E58317
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A

737-300/400/500MAINTENANCE MANUAL
MASK BOX COVER
PSU 
OXYGEN DOOR MASK BOX  MASK BOX 
CSEE MASK PACKING  OXYGEN SUPPLY HOSE 
DSEE PLACEMENT OXYGEN MASK POSITIONING MASK AND HOSE 
LANYARD 
OXYGEN MASK (4 LOCATIONS)

MASK BOX
B

Oxygen Mask Installation
Figure 401 (Sheet 2)

H21746
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
OXYGEN MASK
LANYARD
(2 LOCATIONS)

RESERVOIR BAG
RELEASE
CABLE

MASK BOX
PSU
MASK PACKING
C
Oxygen Mask Installation
Figure 401 (Sheet 3)

H21772
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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 ALL  ú ú 01 Page 404 ú Mar 15/98
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
OXYGEN 
MASK  PSU 
LANYARD 
RELEASE 
LANYARD  CABLE 
(2 LOCATIONS) 

MASK BOX
PSU
MASK AND HOSE POSITIONING
OXYGEN MASK PLACEMENT

D

Oxygen Mask Installation
Figure 401 (Sheet 4)

H21796
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 35-22-31
 ALL  ú ú 01 Page 405 ú Mar 15/98
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A

737-300/400/500
MAINTENANCE MANUAL

OXYGEN GENERATOR SEE B
OXYGEN MASK BOX MASK
MASK BOX
MASK BOX
DOOR SEE A
PASSENGER SERVICE UNIT
MASK MANIFOLD TUBING OUTLET
　
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