(2)
Make sure that a warning notice is in position in the cockpit to tell persons not to operate the emergency oxygen system.
(3)
Make sure that the access platform is in position at the AFT cargo-compartment door 826.
(4)
Make sure that the AFT cargo-compartment door 826 is open (Ref. TASK 52-30-00-860-001).
(5)
Make sure that the CARGO COMPT LIGHT switch 8LU is in the ON position.
(6)
Make sure that the related lining panel is removed (Ref. TASK 25-55-12-000-003).
(7)
Make sure that the manual shut-off valves of the emergency oxygen cylinders are close.
(8)
Obey the special precautions when you do this task (Ref. TASK 35-00-00-860-001).
Subtask 35-23-55-865-051
B. Make sure that this(these) circuit breaker(s) is(are) open, safetied and tagged
-------------------------------------------------------------------------------PANEL DESIGNATION IDENT. LOCATION -------------------------------------------------------------------------------49VU OXYGEN/PASSENGER/CTL AND WARN 2WR HA03 49VU OXYGEN/PASSENGER/CTL AND WARN 1WR HA02
4. Procedure
_________
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.
Subtask 35-23-55-420-050
A. Installation of the Pressure Relief Valve (7000WR)
(Ref. Fig. 401/TASK 35-23-55-991-001)
(1)
Do an inspection of the component interface and/or the adjacent area.
(2)
Remove the vinyl bags from the disconnected line ends.
(3)
Remove the blanking plugs from the disconnected line ends.
(4)
Put the pressure relief valve (7) in position and install the screws
(5) and the washers (6).
NOTE : The flow arrow on the pressure relief valve must point in the
____
flow direction.
(5)
Apply PAINTS FOR DETAIL (INTERNAL AND EXTERN AL) (Material No. 07-001D) and SEALANTS (Material No. 09-016B) to the bonding screw.
(6)
Connect the hoses (1) and (3) and tighten the nuts (2) and (4) with your fingers.
(7)
Tighten the connections CAUTION : MAKE SURE THAT THE FLEXIBLE HOSES ARE NOT TWISTED OR PULLED
_______ TIGHT. IF THE HOSES ARE TWISTED OR PULLED TIGHT, THE CONNECTIONS WILL BREAK AND CAUSE A LEAK.
NOTE : You must hold the fitting tightly in the correct position.
____
(a)
TORQUE the nut (2) to between 1.50 and 1.66 m.daN (11.06 and
12.24 lbf.ft).
(b)
TORQUE the nut (4) to between 3.00 and 3.32 m.daN (22.12 and
24.48 lbf.ft). Subtask 35-23-55-865-052
B. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s): 1WR, 2WR.
Subtask 35-23-55-790-050
C. Do this leakage check (Ref. TASK 35-23-00-790-001). Subtask 35-23-55-614-051
D. Pressurize the Emergency Oxygen System
(1)
Slowly open the manual shut-off valves of the emergency oxygen cylinders 3.5 to 4 turns.
(2)
Let the pressure become stable.
NOTE : This occurs after approximately 90 seconds.
____
(3)
Fully open the manual shut-off valves of the emergency oxygen cylinders.
(4)
If necessary, fill the emergency oxygen cylinders (Ref. TASK 35-21-00-614-002).
Subtask 35-23-55-942-050
E. Remove the warning notice(s).
5. Close-up
________ Subtask 35-23-55-410-050
A. Close Access
(1)
Make sure that the work area is clean and clear of tool(s) and other items.
(2)
Install the related lining panel to close access to the oxygen storage (Ref. TASK 25-55-12-400-003).
(3)
Set the CARGO COMPT LIGHT switch 8LU to the OFF position.
(4)
Remove the access platform(s).
(5)
Close the AFT cargo-compartment door 826 (Ref. TASK 52-30-00-860-002).
Subtask 35-23-55-862-050
B. De-energize the aircraft electrical circuits
(Ref. TASK 24-41-00-862-002).
PORTABLE OXYGEN - DESCRIPTION AND OPERATION___________________________________________
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