812.
(2)
Make sure that the access door 812 is open.
(3)
Make sure that the electrical circuit is energized (Ref. TASK 24-41-00-861-002).
(4)
Make sure that the warning notice which tells persons not to open the valve of the oxygen cylinder is in position.
(5)
Make sure that the warning notice which tells persons not to push the OXYGEN/CREW SUPPLY pushbutton switch is in position.
Subtask 35-13-51-865-051
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
EFF : ALL
35-13-51Page 406
4. Procedure
_________
(Ref. Fig. 401/TASK 35-13-51-991-001) Subtask 35-13-51-420-051
A. Installation of the LP Oxygen-Supply Solenoid-Valve (3HT) 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 of the male threads.
(1)
Put the LP oxygen-supply solenoid-valve (6) on its support (1) and attach it with the screws (2) and the washers (3).
(2)
Remove the blanking plug from the pipe (8).
(3)
Install the new bush (7) on the pipe (8).
(4)
Install the pipe (8) on the solenoid valve (6) and TORQUE it to between 1.9 and 2.7 m.daN (14.01 and 19.91 lbf.ft).
(5)
Remove the blanking plug from the pipe (5).
(6)
Install the new bush (4) on the pipe (5).
(7)
Install the pipe (5) on the solenoid valve (6) and TORQUE it to between 1.9 and 2.7 m.daN (14.01 and 19.91 lbf.ft).
(8) Connect the electrical connector (9) to the solenoid valve (6). Subtask 35-13-51-865-053
B. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s): 1HT
Subtask 35-13-51-790-051
C. Test of the Solenoid Valve
(1)
On the ECAM select DOOR/OXY page.
The OXY LO PR legend comes amber.
(2)
On the panel 21VU, push the OXYGEN/CREW SUPPLY pushbutton switch, the OFF legend goes off. On ECAM no change.
EFF : ALL
35-13-51Page 407
(3)
Apply the solution SPECIAL MATERIALS (Material No. 05-004) to the mechanical connections.
(4)
Very slowly open the valve of the cylinder (5750HM) 3.5 to 4 turns.
(5)
Let the pressure become stable. This occurs after approximately 90 seconds.
(6)
Fully open the cylinder valve.
-On ECAM the OXY LO PR legend goes off.
(7)
Examine each connection to make sure that there are no leaks.
(8)
Rub off the solution SPECIAL MATERIALS (Material No. 05-004).
(9)
On the C/B panel 49VU open the circuit breaker 1HT:
-On ECAM the OXY LO PR legend remains off.
(10)
On the C/B panel 49VU close the circuit breaker 1HT:
-On ECAM no change.
(11)
On the panel 21VU, release the OXYGEN/CREW SUPPLY pushbutton switch. The OFF legend comes on.
(12)
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.
(13)
On the DOOR page of the lower display unit of the ECAM system, the OXY LO PR legend comes on amber.
NOTE : The OXY LO PR legend goes off when the LP oxygen-supply
____
solenoid-valve (3HT) is open.
5. Close-up
________ Subtask 35-13-51-860-051
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(s).
(3)
De-energize the aircraft electrical circuits
(Ref. TASK 24-41-00-862-002).
EFF : ALL
35-13-51Page 408
Subtask 35-13-51-410-050
B. Close Access
(1)
Close the access door 812.
(2)
Remove the access platform(s).
EFF : ALL
