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Purpose
The passenger oxygen system supplies emergency oxygen to
the passengers and cabin attendants.
Location
Passenger oxygen generators, masks, firing pin mechanisms,
and deployment door latch actuators are in these units:
* Passenger service units (PSUs)
* Lavatory service units (LSUs)
* Attendant service units (ASUs).
A guarded toggle switch for manual release of the passenger
oxygen masks is on the P5 aft overhead panel.
A pressure switch for automatic release of the passenger
oxygen mask is in the J23 junction box in the EE compartment.
General Description
The passenger oxygen system uses chemical generators to
make oxygen. Oxygen from the generators flows through
flexible supply hoses to the passenger oxygen masks.
* Manually by the crew with a guarded toggle switch on the
oxygen system control panel (P5)
* Automatically by operation of a pressure switch (14000 feet
cabin altitude).
Operational Displays
The PASS OXY ON light on the P5 aft overhead panel comes on
when the passenger oxygen masks deploy.
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Purpose
The door latch actuator causes the oxygen mask door to open
and let the oxygen mask fall free.
Physical Description
The door latch actuator has these components:
* Solenoid
* Spring-loaded latch actuator
* Spring-loaded striker
* Spring-loaded door latch.
Location
There door latch actuators are in these units:
* Passenger service units (PSUs)
* Attendant service units (ASUs)
* Lavatory service units (LSUs).
Functional Description
The door latch actuator has an electrically controlled solenoid,
which removes a pin from the striker. When the spring loaded
striker releases the latch, it causes the oxygen mask box door
to open.
Training Information Point
The test stop assembly stops the door for system checks.
OXYGEN - PASSENGER - DOOR LATCH ACTUATOR
EFFECTIVITY
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Purpose
The passenger oxygen mask deployment doors have test/reset
buttons. These buttons are for these reasons:
* To make door deployment tests easier
* To reset the door latch actuator.
Physical Description
The test/reset button is a rectangular piece on the passenger
oxygen mask door.
Functional Description
In the normal position, the stop is faired with the door panel. In
the normal position, the stop will allow the door to fully open
when the latch actuator is energized.
In the test position, the stop is pulled out of and turned
crosswise to its recess in the door panel. In this position it will
block the doors from opening far enough to drop the masks.
This position is used when testing the mask deployment
system.
Do these steps to reset the door latch actuator:
* Hold the oxygen mask door panel closed
* Align the test/reset button to the normal position
* Push on the test stop and reset button.
You hear a click when the spring loaded latch actuator resets.
Training Information Point
The PSU oxygen door panels can be opened manually. To do
this, insert a 0.125 in (3.0 mm) pin punch into the door panel
release hole. Then push up against the latch release to open
the door.
The attendant service oxygen panel doors and lavatory service
oxygen panel doors can be opened manually. To do this, insert
a flat tool (6.0 in. pocket scale) in the door edge gap. Then push
up against the latch release to open the door.
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