(3)  
AMM 35-22-31/201, Oxygen System

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

 D.  Prepare for Actuator Removal
 S 864-002
 (1)  Open these circuit breakers and attach DO-NOT-CLOSE tags:
 (a)  P18-3 Panel
 1) 3F9, OXYGEN SYSTEM PASS R or
 PASS OXYGEN RIGHT

 2)  3F8, OXYGEN SYSTEM PASS L or PASS OXYGEN LEFT
 E.  Get Access to the Actuator
 S 014-021
 WARNING: YOU MUST DISARM THE OXYGEN GENERATOR WITH THE SAFETY PIN IF THE
_______ OXYGEN GENERATOR WAS NOT FIRED. A FIRED OXYGEN GENERATOR GETS VERY HOT (450°F OR HIGHER). A HOT OXYGEN GENERATOR CAN CAUSE INJURY IF YOU TOUCH IT.
 (1)  
To get access to the actuator on the passenger service unit, refer to AMM 25-23-61/201 to lower the PSU.

 S 014-006

 (2)  
For access to the actuator on the forward and aft left attendant's mask boxes, do the steps that follow (Fig. 401):

 (a)  
Put an 1/8-inch rod into the latch access hole in the service unit.

 (b)  
To open the mask box door, push the rod to release the door latch.

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 (c)  Permit the oxygen masks to fall.
 S 014-009
 (3)  For access to the lavatory and the aft aisle right attendant's mask boxes, do the steps that follow (Fig. 401):
 (a)  
Put an 1/8-inch rod into the latch access hole adjacent to the test stop button.

 (b)  
Push the rod to release the door latch and open the mask box door.

 (c)  
Let the oxygen masks fall.

 S 024-010
 (4)  On the attendant's and lavatory mask boxes, do the steps that follow:
 (a)  
Hold the mask box.

 (b)  
Remove the screws shown in Fig. 402 that attach the mask box to the support brackets or the shroud.

 (c)  
Slowly lower the mask box until you get access to the actuator electrical connections.

 F. Remove the Actuator (Fig. 402)
 S 034-011
 (1)  Disconnect the electrical wires.

FLAT TOOL

FORWARD AND AFT LEFT SIDE ATTENDANT'S MASK BOX LAVATORY AND AFT AISLE ATTENDANT'S MASK BOX
Manual Opening of the Mask Box Door Figure 401
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
SCREW ATTACHES MASK 
BOX TO SHROUD OR 
MASK BOX  SUPPORT BRACKET 
ACTUATOR DOOR LATCH  (4 LOCATIONS IN THE MASK BOX) 
SEE  A 

OXYGEN 
DOOR LATCH ACTUATOR  MASK 
SEE  A  DOOR 
LATCH 
PASSENGER SERVICE UNIT 
SCREW ATTACHES MASK  MASK BOX 
BOX TO SUPPORT BRACKET  DOOR 
(4 LOCATIONS IN THE 
MASK BOX ON FORWARD 
DOOR LATCH  LEFT HAND ATTENDANT'S 
ACTUATOR  ONLY) 
SEE  A 
LAVATORY AND AFT AISLE 
DOOR  ATTENDANT'S MASK BOX  1 
LATCH 
MOUNTING SCREW 
(2 LOCATIONS) 

OXYGEN
MASKS
MASK
BOX

SCREW ATTACHES MASK BOX TO CEILING PANEL OR SERVICE PANEL (4 LOCATIONS ON AFT MASK BOXATTENDANT'S) DOOR(6 LOCATIONS ON FORWARD LEFT HAND ATTENDANT'S) ELECTRICAL WIRES
FORWARD AND AFT LEFT
ACTUATOR ATTENDANT'S MASK BOX
DOOR LATCH ACTUATOR
1LAVATORY A CAN HAVE A DIFFERENT
A
ARRANGEMENT OF COMPONENTS
Door Latch Actuator Installation Figure 402
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