3. Job Set-up
__________ Subtask 35-11-42-860-050
A. Aircraft Maintenance Configuration
(1)
Make sure that the access platform is in position at the access door
812.
(2)
Make sure that the access door 812 is open.
(3)
Make sure that the ground service network is energized (Ref. TASK 24-42-00-861-001).
4. Procedure
_________ (Ref. Fig. 401/TASK 35-11-42-991-001) Subtask 35-11-42-420-052
A. Installation of the Oxygen Fill Port (5769HM) NOTE : Only use SPECIAL MATERIALS (Material No. 05-003B) on the thread of
____ the nut or on the flared portion of the tube. Apply only a thin layer of the compound on the first three male threads.
(1)
Install the fill port in its support and attach it with the screws
(1) and the nuts (3).
(2)
Remove the blanking cap from the tube (5).
(3)
Install the new sleeve (4) on the tube (5).
(4)
Remove the blanking cap from the fill port.
(5)
Install and tighten the tube (5) on the fill port (2).
5. Close-up
________ Subtask 35-11-42-860-051
A. Put the aircraft back to its initial configuration.
(1)
Make sure that the work area is clean and clear of tool(s) and other items.
(2)
Very slowly open the valve of the cylinder (5750HM) 3.5 to 4 turns.
(3)
Let the pressure become stable. This occurs after approximately 90
seconds.
(4) Fully open the valve of the cylinder. Subtask 35-11-42-410-050
B. Close Access
(1)
Close the access doors 812.
(2)
Remove the access platform(s).
OXYGEN DISTRIBUTION - DESCRIPTION AND OPERATION_______________________________________________
R R R R R R R R 1. General_______ (Ref. Fig. 001) Each flight crew station is supplied with oxygen through a distribution circuit. The distribution circuit comprises: - a low-pressure supply valve, - a distribution manifold, - low-pressure stainless-steel distribution pipes, - flexible hoses and stowage box assemblies, - full-face quick-donning masks with a demand regulator.
2. Component Description_____________________
A. Low-Pressure Supply Valve The low-pressure supply valve is installed between the pressure regulator/transmitter and the distribution manifold. A flexible hose connects the valve to the pressure regulator/transmitter. A stainless-steel rigid pipe connects the valve to the distribution manifold. The supply valve is a solenoid valve that is supplied with 28VDC from the essential busbar 801PP. The flight crew can control the supply valve from the control panel 21VU, in the cockpit.
B. Distribution Manifold
(1) The distribution manifold is a forged component to decrease the pos-sibility of leaks. Two distribution pipes are connected to the manifold. The chamber in the distribution manifold helps to increase the performance and safety of the distribution circuit.
(2) A low-pressure switch is installed on the distribution manifold. It operates when the oxygen supply pressure decreases to 3.45 plus or minus 0.35 bar (50 plus or minus 5 psig) and transmits a warning signal REGUL LO PR to the ECAM system in the cockpit.
(3) A rigid pipe connects the test point to the distribution manifold. The test point permits a pressure test and leak test to be carried out. The maximum pressure that can be used at the test point is 10 bar (145 psig).
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Oxygen Distribution Circuit - Schematic
Figure 001
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CES
C. Distribution Pipes The two distribution pipes are rigid and made of stainless-steel. They supply oxygen to the flight crew stations. One pipe supplies the captain and 4th occupant stations. The other pipe supplies the 1st officer and 3rd occupant stations. Flexible hoses make the connection to the stowage box assemblies.
D. Stowage Box Assembly (Ref. Fig. 002, 003)
(1)
The stowage box assemblies are installed in the cockpit next to each flight crew station. Each box is the connection point for the full-face quick-donning mask which is kept in the box until required for use. When the mask is removed, the oxygen system is automatically switched on. A flow indicator blinks to show that the oxygen flows.
(2)
The two doors on the stowage box keep the mask in the box. When the left door is opened with the removal of the mask, the oxygen supply valve in the stowage box will open and permit oxygen to flow to the mask. Once the left door has been opened and the oxygen flows, a flag OXY ON. This flag will not go out of sight until the supply valve has been closed and reset.
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