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3. Job Set-up
__________ Subtask 35-13-14-860-052
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 24-41-00-861-002).
(4)
Make sure that the warning notice which tells persons not to push the OXYGEN/CREW SUPPLY pushbutton switch is in position.
(5)
Make sure that the warning notice which tells persons not to open the valve of the oxygen cylinder is in position.
Subtask 35-13-14-865-051
B. Make sure that this(these) circuit breaker(s) is(are) open, safetied and tagged
-------------------------------------------------------------------------------PANEL DESIGNATION IDENT. LOCATION -------------------------------------------------------------------------------49VU OXYGEN/CREW/OXY/SPLY 1HT HA01
4. Procedure
_________
(Ref. Fig. 401/TASK 35-13-14-991-001) Subtask 35-13-14-420-051
A. Installation of the Oxygen Pressure Switch
(1)
Apply BONDING AND ADHESIVE COMPOUNDS (Material No. 08-063) to the threads of the pressure switch (2).
(2)
Remove the blanking caps from the connector (3) and the manifold (1).
(3)
Install the pressure switch (2) on the manifold (1).
(4)
TORQUE to between 2.95 and 3.33 m.daN (21.75 and 24.55 lbf.ft).
EFF : ALL
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(5) Connect the electrical connector (3) to the pressure switch (2). Subtask 35-13-14-865-053
B. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s): 1HT
Subtask 35-13-14-790-051
C. Leak Test
(1)
ON the panel 21VU, push the OXYGEN/CREW SUPPLY pushbutton switch, the OFF legend goes off.
(2)
Apply the solution SPECIAL MATERIALS (Material No. 05-004) to the connection.
(3)
Very slowly open the valve of the cylinder (5750 HM) 3.5 to 4 turns.
(4)
Let the pressure become stable. This occurs after approximately 90 seconds.
(5)
Fully open the cylinder valve.
(6)
Examine each connection to make sure that there are no leaks.
(7) Rub off the solution SPECIAL MATERIALS (Material No. 05-004). Subtask 35-13-14-790-050
D. Electrical Test
(1)
On the panel 21VU, release the OXYGEN/CREW SUPPLY pushbutton switch. The OFF legend comes on.
(2)
On the oxygen-mask stowage box, operate the PRESS TO TEST AND RESET control slide a sufficient number of times to make the system empty.
(3)
Do the EIS start procedure (Upper ECAM DU and lower ECAM DU only) (Ref. TASK 31-60-00-860-001)
(4)
On the DOOR page, on the lower ECAM DU, the OXY LO PR indication comes on amber. NOTE: The OXY LO PR indication goes off when the LP oxygen supply solenoid valve (3HT) is open.
EFF : ALL
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5. Close-up
________ Subtask 35-13-14-860-051
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)
Remove the warning notice.
(3)
Do the EIS stop procedure (Ref. TASK 31-60-00-860-002).
(4)
De-energize the aircraft electrical circuits. (Ref. TASK 24-41-00-862-002)
Subtask 35-13-14-410-051
B. Close Access
(1)
Close the access door 812
(2)
Remove the access platform(s).
EFF : ALL
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TRANSMITTER/PRESSURE REGULATOR - OXYGEN (4HT) - REMOVAL/INSTALLATION
____________________________________________________________________ TASK 35-13-15-000-001 Removal of the Oxygen Pressure Regulator/Transmitter (4HT) WARNING : KEEP ALL HYDROCARBONS (FUELS, LUBRICANTS, ETC.) AWAY FROM ALL SOURCE
_______ OF OXYGEN. OXYGEN BECOMES EXPLOSIVE WHEN IT TOUCHES HYDROCARBONS.
WARNING : CLEAN THE TOOLS AND MAKE SURE YOUR HANDS ARE CLEAN TO PREVENT
_______
CONTAMINATION OF THE OXYGEN SYSTEM.
CAUTION : PUT DRY, CLEAN, METAL OR PLASTIC PLUGS ON ALL PIPES OR UNITS REMOVED
_______
TEMPORARILY. PUT EACH PIPE OR UNIT IN A SEALED VINYL BAG.
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