777 AMM 飞机维护手册 氧气 Oxygen(6)

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The generator contains iron and sodium chlorate.
An expended indicator is around the middle of the generator. It goes to a dark color to show that the generator has been used.
Functional Description
When a passenger or attendant pulls on an oxygen mask, the lanyard and release cable pull the release pin out of the firing pin. The spring moves the firing pin into the primer. This causes the iron and sodium chlorate to react to release oxygen.
You cannot stop the reaction after it starts. There is full oxygen flow 10 seconds after the reaction starts. The oxygen flows at least 22 minutes.
Training Information Point
The expended indicator turns a dark color because of the heat of the reaction. This shows you that you must replace the generator.
There are pliers you use to pull out on the firing pin so you can put in a safety pin.
WARNING: MAKE SURE THE SAFETY PIN IS INSTALLED. THE GENERATOR IS A PYROTECHNIC ARMED DEVICE. IF THE GENERATOR FIRES, IT WILL GET VERY HOT (450 F OR MORE), WHICH CAN CAUSE INJURY TO PERSONS OR CAN CAUSE DAMAGE TO EQUIPMENT.
WARNING: MAKE SURE TO REMOVE THE SAFETY PIN FROM THE GENERATOR. THE GENERATOR WILL NOT FIRE IN AN EMERGENCY IF THE SAFETY PIN IS IN THE GENERATOR.
NOTE: If the firing pin is in the fired position (you cannot install the release pin), the generator has fired.
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PASSENGER OXYGEN -CHEMICAL OXYGEN GENERATOR

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PASSENGER OXYGEN -DOOR LATCH/ACTUATOR -TRAINING INFORMATION POINT

There is a restraint tool you use when you test the door latch/ actuator. The tool goes through a slot in the PSU oxygen door. Push up on the tool until it locks in position.
When you push the passenger oxygen switch on the P5 overhead panel, you release the oxygen doors on the PSUs so they can open. The restraint tool will let the door open sufficiently so you can see that the latch/actuator operates correctly. The door cannot open sufficiently to let the masks drop.
Door Latch/Actuator Reset
The electric circuit that causes the latch/actuator to open will reset automatically after two minutes.
After the test you must reset the latch/actuators and close the doors. The open space between the door and the PSU is sufficient to let you touch the latch/actuator. Push the lever arm of the latch/actuator against the force of its spring so the lever goes against the housing. The magnet in the housing will hold the lever arm in this position.
Close the door. To remove the restraint tool, push up on the tool, pull it to the side, and then pull it down.
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PASSENGER OXYGEN -DOOR LATCH/ACTUATOR -TRAINING INFORMATION POINT

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777 AIRCRAFT MAINTENANCE MANUAL

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PORTABLE OXYGEN -GENERAL DESCRIPTION

Portable oxygen equipment lets the flight attendants move in the airplane when oxygen is in use. It is also a gaseous oxygen supply for medical emergencies.
Physical Description
The portable oxygen equipment has these components:
*
Regulator (2)

*
Shutoff valve

*
Gage

*
Hose

*
Cylinder

*
Mask.

Operation
You connect the mask hose to the regulator that gives the oxygen flow that you want. One regulator supplies four liters per minute. The other supplies two liters per minute. Oxygen will flow through the regulator when you connect the mask and open the shutoff valve.
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777 AIRCRAFT MAINTENANCE MANUAL

PORTABLE OXYGEN -GENERAL DESCRIPTION

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