(b)  
Push the rod to release the door latch.

 (c)  
Permit the mask box door to open.

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A 737-300/400/500MAINTENANCE MANUAL
BASEE (EXAMPLE) UNIT SERVICE PASSENGER 
FWD 
PASSENGER COMPARTMENT 
CSEE MASK BOX  GENERATOR OXYGEN 
FWD 
A 1 PASSENGER SERVICE UNIT (EXAMPLE) 

MASK PLACEMENT
SEE E
FWD

PASSENGER SERVICE UNIT (EXAMPLE) B1 1
AS INSTALLED
Passenger Service Unit (PSU) Oxygen Mask Placement in Mask Box Figure 203 (Sheet 1)
L86716
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A

737-300/400/500MAINTENANCE MANUAL
MASK BOX COVER
PSU 
DOOR MASK BOX OXYGEN  MASK BOX 
FWD  DSEE MASK PACKING INSTALLATION  SUPPLY HOSE OXYGEN 

LANYARD
OXYGEN MASK (4 LOCATIONS)
MASK BOX C
Passenger Service Unit (PSU) Oxygen Mask Placement in Mask Box Figure 203 (Sheet 2)
L86517
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A 737-300/400/500MAINTENANCE MANUAL 
OXYGEN MASK 
RELEASE CABLE 
BOX DOOR OXYGEN MASK  FITTING RELEASE CABLE 
BAG RESERVOIR 
(2 LOCATIONS) LANYARD 
FWD  MASK BOX  PSU 
D MASK PACKING INSTALLATION 

Passenger Service Unit (PSU) Oxygen Mask Placement in Mask Box
Figure 203 (Sheet 3)

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L86527
A 737-300/400/500MAINTENANCE MANUAL
OXYGEN GENERATORS 2
MASK TUBING
MASK PLACEMENT E
2 EACH PSU CONTAINS ONE OR TWO OXYGEN GENERATORS
Passenger Service Unit (PSU) Oxygen Mask Placement in Mask Box Figure 203 (Sheet 4)
L86459
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A
737-300/400/500MAINTENANCE MANUAL
 (d)  Permit the masks to fall.
 S 862-018
 (2)  If the lavatory or the aft aisle right attendant's mask box door is closed, do the steps that follow:
 (a)  
Put an approved tool into the latch access hole which is adjacent to the test stop button (Fig. 207).

 (b)  
Push the tool to operate the door latch.

 (c)  
Permit the mask box door to open.

 (d)  
Permit the masks to fall.

 S 212-030
 (3)  To see if the generator fired, do the steps that follow:
 (a)  
If the heat sensitive band on the generator has a black color the generator fired.

 (b)  
If the firing pin is in the fired position, the generator fired or the firing mechanism is bad.

 NOTE: The fired position is when the firing pin is against
　
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