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These components are in the J23 junction box in the EE
compartment:
* R323 passenger oxygen manual deployment relay
* R322 passenger oxygen auto deployment relay
* R324 passenger oxygen indicator relay
* 14,000 ft. altitude pressure switch.
The PASS OXYGEN switch and PASS OXY ON amber light are
on the P5 aft overhead panel.
The passenger oxygen door latch actuators are in these units:
* Passenger service units (PSUs)
* Lavatory service units
* Flight attendant service units.
Operational Controls
The door latch actuators receive power through the energized
contacts of the oxygen deployment relays energized by either of
these:
* PASS OXYGEN switch to ON (R323)
* Operation of the 14,000 ft. switch (R322).
Operational Displays
The oxygen indicator relay is energized through the energized
contacts of either of the two oxygen deployment relays. The
energized contacts of the oxygen indicator relay cause these
things to happen:
* PASS OXY ON amber light comes on
* MASTER CAUTION and OVERHEAD annunciator lights come
on
* Relay holding circuit energizes.
The holding circuit keeps the indication relay energized until
power is removed from the 28v dc battery bus.
Training Information Point
See the Communications chapter for more information on cabin
announcements during decompression. (CHAPTER 23).
See the Lights chapter for more information on cabin lights
during decompression. (CHAPTER 33).
OXYGEN - PASSENGER - DOOR LATCH ACTUATOR - FUNCTIONAL DESCRIPTION
EFFECTIVITY
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OXYGEN - PASSENGER - DOOR LATCH ACTUATOR - FUNCTIONAL DESCRIPTION
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
Purpose
Portable oxygen cylinders are used for walk around first aid and
sustaining purposes.
Protective breathing equipment (PBE) supplies a crew member
with a smoke hood and an air system for protection against
smoke or toxic fumes. The PBEs protect the user during fire
fighting operations.
Location
These are the locations where there is portable oxygen
equipment:
* Exterior walls of windscreens, lavatories, and galleys
* Placarded overhead stowage bins
* Placarded storage units.
General Description
Each portable oxygen cylinder is a separate system. The
cylinder stores a supply of oxygen under high pressure (1800
psig at 70F (21C)). An indicator on the cylinder shows cylinder
pressure (quantity of oxygen available). A shutoff valve on the
cylinder head controls the flow of the high pressure oxygen to
the cylinder head assembly. Cylinder head components
regulate oxygen pressure and flow to the attached mask(s).
The portable oxygen cylinders have these features:
* Identifying and instructional placards
* High pressure cylinder
* Cylinder pressure gage
* Shutoff valve
* Cylinder head assembly
* Mask
* Carrying strap.
Each PBE is a separate system. The PBE has these features:
* Vacuum sealed storage container with identifying and
instructional placards
* Loose fitting universal sized smoke hood with oronasal mask
and breathing air system.
Interface
The portable oxygen equipment is independent (separate) of
the other aircraft systems.
Standard outlet fittings (bayonet type) are used on the portable
oxygen cylinders.
OXYGEN - PORTABLE - INTRODUCTION
EFFECTIVITY
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