(2)
Each attendant and lavatory mask is connected directly to the generator outlet nozzle.
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A
737-300/400/500MAINTENANCE MANUAL
PASSENGER SERVICE UNIT (PSU)
E62525
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A
737-300/400/500MAINTENANCE MANUAL
PASSENGER SERVICE UNIT
SEEC 3
DOOR
MASKS DEPLOYED
OXYGEN MODULE
SEE D DOOR TEST STOP AND RESET BUTTON
FWD OUTBD
CROSS SECTION OF PASSENGER CABIN (VIEW IN THE AFT DIRECTION) PASSENGER SERVICE UNIT 3
OXYGEN C
TUBING
CHEMICAL MASK
OXYGEN
GENERATOR
MANIFOLD
MASK LANYARD
RELEASE PIN
OXYGEN MODULE 3 D
Passenger Oxygen System Components
Figure 1 (Sheet 2)
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E62553
A 737-300/400/500MAINTENANCE MANUAL
DOOR LATCH
LAVATORY A CAN HAVE A DIFFERENT ARRANGEMENT OF COMPONENTS
Passenger Oxygen System Components Figure 1 (Sheet 3)
E62581
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A 737-300/400/500MAINTENANCE MANUAL
4. Door Latch Actuator
___________________
A. Each oxygen mask box has a door latch actuator (Fig. 1). The actuator has a solenoid switch with a plunger.
B. When the passenger oxygen system is actuated either automatically or manually, the solenoid is energized. This causes the plunger to strike the latch lever. This action releases the mask box door and the masks fall free. After operation, the actuator must be reset by pushing upwards on the test stop button.
C. During normal flight conditions, the solenoid is not energized and springs hold the latches in the latched position. This keeps the mask box door open. The masks are held in the stored position by the latched door.
D. The door latch can be operated manually for maintenance access. A latch actuation tab that is normally hidden from view is installed adjacent to the test stop button.
(1)
Mask box doors in the passenger service unit and at the left attendant's station are manually opened. A 0.125-inch pin punch is inserted into the hole adjacent to the test stop button. The pin punch is then pushed to operate door latch.
(2)
Mask box doors in the lavatory and at the aft aisle attendant's station are manually opened. A thin flat tool is inserted into the gap between the mask box door and the ceiling panel (adjacent to test stop button). The thin flat tool is pushed to operate the door latch.
5. Operation (Fig. 2)
_________
A. Chemical oxygen generators are used to supply oxygen to each passenger and attendant. Oxygen flow to the masks is started when the mask is pulled downward. This causes the chemical oxygen generator to start a chemical reaction one product of which is oxygen.
B. Mask deployment occurs automatically by an altitude pressure switch when cabin pressure decreases to that equal to an altitude of 14,000 feet. The pressure switch energizes the door latch actuator which causes the mask box door to open and the masks to fall free. Mask deployment can also occur manually by moving the passenger oxygen switch on the aft overhead panel to ON.
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