747-400 AMM 飞机维护手册 氧气 OXYGEN(6)

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 (i) (j) (k) (l) (m)  Make sure the connector engages the fitting threads at least two full turns before you use a wrench.Install the fitting connections with a back-up wrench to prevent damage to the fitting.Tighten all the crew oxygen system tubing and fittings to the standard torques (Ref 20-51-01/201).Examine all the connections for leaks.If you can not stop a leak replace the defective part.

 WARNING:_______ OPEN THE OXYGEN SYSTEM VALVE SLOWLY.  IF YOU OPEN OR CLOSE
 THE VALVES QUICKLY, THE TEMPERATURE OF THE OXYGEN CAN
 INCREASE.  THIS CAN CAUSE A FIRE OR AN EXPLOSION.

 (n)  
Open the oxygen shutoff valve slowly with your hand. NOTE: The maximum torque is 25 pound-inches.

____

 (o)  
Close the valve one quarter of a turn.

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 (p)  Install a lockwire on the valve. NOTE: Use the 0.020 inch diameter copper lockwire
____
 (AMM 20-11-28/401).

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 OXYGEN - CLEANING/PAINTING
__________________________
 1.  General_______
 A.  These tasks are included in the procedure:
 (1)  
PSU Mask Door and Adjacent Surfaces and Latch Cleaning

 (2)  
Oxygen System Component Cleaning

 B.  Make sure that when you do the installation and maintenance of the oxygen system that all work is done under clean conditions. You must make sure all work in the the oxygen system is done under clean conditions for two causes. One, the system is used in an emergency for breathing. Secondly, oxygen supports combustion when a combustible contaminant and ignition conditions are present. Thus, the contamination within the system could provide noxious or toxic fumes to the user. It could also prevent the system components from operating properly, or produce a fire and explosion. Contamination on the exterior surfaces of the oxygen system components can cause fires in the presence of oxygen leaks or ignition conditions.
 NOTE: All oxygen system components must be clean and dry when installed.
____
 TASK 35-00-00-107-001
 2.  PSU Mask Door and Adjacent Surface and Latch Cleaning_____________________________________________________
 A.  General
 (1)  After an extended period of time, a dust nicotine layer can collect on the PSU mask door and adjacent surfaces and latches. Due to this dust/nicotine layer, the PSU mask doors could remain closed in an emergency. These surfaces should be cleaned periodically to make sure the mask doors operate correctly.
 B.  References
 (1)  
35-00-00/201, Oxygen

 (2)  
35-21-06/401, Passenger Oxygen Mask

 (3)  
35-21-06/601, Passenger Oxygen Mask

 (4)  
IPC 35-21-05

 (5)  
IPC 35-21-06

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MAINTENANCE MANUAL

 C. Access
 (1)  Location Zone
 200 Upper Half Fuselage

 D. Procedure
 S 917-012
 (1)  
Read and obey the safety precautions and general instructions before you do the maintenance (Ref 35-00-00/201).

 S 017-002

 (2)  
Manually open the oxygen box doors and let the masks drop (AMM 35-21-06/401).

 S 127-003

 (3)  
Do the task: "Clean the Airplane Equipment and Furnishings" (AMM 25-00-00/701) to clean the oxygen box door, adjacent surface, and latches.
　
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