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* A bright yellow silicon rubber facepiece with breathing
valves, elastic headstrap, and generator release lanyard
* Flexible supply tube and reservoir bag.
Location
The passenger oxygen masks are in the passenger service
units (PSUs), the flight attendant service units, and the lavatory
service units. An extra mask is in each station for an infant.
Functional Description
When stowed, the masks are in the service unit.
When released, the masks hang by a mask lanyard. When you
pull the mask to your face, the mask lanyard pulls on the
release cable. This starts the oxygen flow.
Oxygen from the manifold flows through the mask tubing to the
reservoir bag. The reservoir bag stores oxygen from the
constant outflow of the generator when the user is not inhaling.
When you breathe in, the oxygen flows through the reservoir
bag and the mask inhalation valve. When there is no more
oxygen in the bag, the mask ambient air valve opens to let
ambient air enter the face piece.
When you breathe out, the inhalation and ambient air valves
close, and the exhalation valve opens. The exhalation valve lets
the used air flow out of the mask.
Operational Controls
Place the yellow face piece over your mouth and nose. The soft
silicon rubber of the mask contours to the facial features to give
a good seal. Hold the mask in place with your hand or with the
elastic headstrap over your head. To adjust the headstrap, pull
on one of its ends.
Operational Displays
Instructions for mask use are on the reservoir bag.
In some models the reservoir bag has a built-in flow indicator
which inflates when oxygen flows into the bag. The indicator
area is shaded green for easy recognition. Other configurations
include an in-line flow indicator which changes color to green in
the presence of oxygen.
OXYGEN - PASSENGER - PASSENGER OXYGEN MASK
EFFECTIVITY
GUN ALL 35-20-00
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Training Information Point
The length of the oxygen tube is different for the various bag
and tube assemblies. Be sure to use the correct length.
When you repitch PSUs for class configuration changes, make
sure the gasper hose brackets near the PSUs do not interfere
with the passenger oxygen supply tubing. If improperly spaced,
the brackets can pinch or cut the supply tubing when the PSU is
closed.
OXYGEN - PASSENGER - PASSENGER OXYGEN MASK
EFFECTIVITY
GUN ALL 35-20-00
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
35-20-00-215
OXYGEN - PASSENGER - PASSENGER OXYGEN MASK
OXYGEN - PASSENGER - PASSENGER OXYGEN MASK
EFFECTIVITY
GUN ALL 35-20-00
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
35-20-00-215
Purpose
The altitude pressure switch releases the passenger oxygen
mask automatically when cabin altitude is at or above 14000
feet.
The automatic or manual release of oxygen masks is done
electrically.
Location
The oxygen release components are in the J23 box in the EE
compartment. The J23 box is on the left side of the EE
compartment access door.
Physical Description
The J23 contains these components:
* Manual oxygen deployment relay, R323
* Automatic oxygen deployment relay, R322
* Oxygen indication relay, R324
* Altitude pressure switch S813.
OXYGEN - PASSENGER - PRESSURE SWITCH AND RELAYS
EFFECTIVITY
GUN ALL 35-20-00
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
35-20-00-219
OXYGEN - PASSENGER - PRESSURE SWITCH AND RELAYS
OXYGEN - PASSENGER - PRESSURE SWITCH AND RELAYS
EFFECTIVITY
GUN ALL 35-20-00
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
35-20-00-219
Functional Description
The oxygen mask doors are held closed by a spring-loaded
door latch.
The passenger oxygen masks deploy electrically by 28v dc.
This energizes the door latch actuator solenoid and releases a
spring-loaded latch actuator. The striker pushes the oxygen
mask door open.
Location
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