*
Shutoff valve
*
Threaded connection (not shown) for B-nut on the thermal compensator and overboard discharge line
*
Thermal relief frangible disc (not shown).
A cylinder support structure holds the cylinder to the airplane. There are retainer rings at both ends of the structure. The forward ring is set and cannot move. The aft ring is movable. Fittings on the bottom of the aft ring let you connect it to the structure and turn it up over the end of the cylinder.
One end of the retainer strap connects to the set ring. The other end of the strap has a tee bolt. It goes through the top of the movable ring. A nut holds the ring and bolt together.
The B-nuts on the thermal compensator and overboard discharge line connect them to the cylinder fitting.
The high pressure supply line lets oxygen flow into the thermal compensator and cylinder. It also lets oxygen flow out of the cylinder to the mask supply line.
The thermal relief frangible disc in the fitting breaks to release oxygen to the overboard discharge line when cylinder pressure gets above safe cylinder limits.
Training Information Point
There are two positions for the movable retainer ring on the cylinder support structure. One position lets the structure hold a composite cylinder. The other lets it hold a steel oxygen cylinder.
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777 AIRCRAFT MAINTENANCE MANUAL
CREW OXYGEN -CYLINDER
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CREW OXYGEN -OVERBOARD DISCHARGE INDICATOR
The overboard discharge indicator shows when overpressure causes an oxygen release from the flight crew oxygen cylinder.
Location
The indicator is to the left of the nose landing gear wheel well.
Physical Description
The indicator is a green disc. A snap ring holds it in position.
Functional Description
An overpressure condition causes the frangible disc in the oxygen cylinder to break. The oxygen flows through the overboard discharge line to the overboard discharge port. The pressure pushes the indicator disc out of the snap ring. The disc falls away.
Training Information Point
If the disc is gone, do a check to see if the oxygen cylinder is empty.
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CREW OXYGEN -OVERBOARD DISCHARGE INDICATOR
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CREW OXYGEN -HIGH PRESSURE DISTRIBUTION COMPONENTS
These are the high pressure distribution components:
*
Pressure transducer
*
Pressure regulator
*
Check valve
*
Thermal compensator.
Purpose
The pressure transducer tells the airplane information management system (AIMS) the pressure in the oxygen cylinder when the cylinder shutoff valve is open.
The pressure regulator reduces cylinder pressure to 70 psi in the supply line to the masks.
The check valve prevents the flow of oxygen out of the cylinder through the fill line.
The thermal compensator absorbs the heat that the pressurized oxygen causes when it fills an unpressurized line.
Location
These components are adjacent to the oxygen cylinder.
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CREW OXYGEN -HIGH PRESSURE DISTRIBUTION COMPONENTS
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CREW OXYGEN -BLEED VALVE
The bleed valve helps to make sure that the AIMS gets correct oxygen cylinder pressure information.
Location
The valve is on the lower, left side of the MEC. It is below and forward of the third step of the walkway.
Physical Description
The valve has a solenoid which supplies the force to open the valve.
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CREW OXYGEN -BLEED VALVE
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CREW OXYGEN -CREW OXYGEN MASK AND STOWAGE BOX
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