(2)
Put the access platform below the AFT cargo-compartment door 826.
(3)
Set the CARGO COMPT LIGHT switch 8LU to the ON position.
(4)
Remove the related lining panel to get access to the oxygen storage
(Ref. TASK 25-55-12-000-003).
(5)
Close the manual shut-off valves of the emergency oxygen cylinders.
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.
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.
Subtask 35-00-00-860-051
A. Obey the special precautions when you do this task (Ref. TASK 35-00-00-860-001).
Subtask 35-00-00-020-050
B. Removal of a Line from the Gaseous Oxygen System
(1)
If necessary, remove the clamps from the line. NOTE : Make a note of the position of the clamps for the installation
____
procedure.
(2)
If necessary, remove the bonding straps from the line. NOTE : Make a note of the position of the bonding straps for the
____
installation procedure.
(3)
Disconnect the unions with 2 wrenches. NOTE : You must hold the fitting tightly in the correct position.
____
(4)
Immediately put clean PLUG - BLANKING, APPROVED FOR USE WITH OXYGEN on the disconnected line ends.
(5)
Put the disconnected line ends into a sealed BAG - VINYL.
Subtask 35-00-00-420-050
C. Installation of a Line in the Gaseous Oxygen System
(1)
Remove the vinyl bags from the disconnected line end, that you install first.
(2)
Remove the blanking plugs from one end of the line and the union.
(3)
If necessary, carefully clean the unions with CLEANING AGENTS (Material No. 11-005) and a clean lint-free cloth.
(4)
Do an inspection of the component interface and/or the adjacent area.
(5)
Connect the line and tighten it with your fingers.
(6)
Remove the vinyl bags from the other disconnected line end.
(7)
Remove the blanking plugs from the other end of the line and the union.
(8)
Connect the line and tighten it with your fingers.
(9)
If necessary, install the clamps on the line.
(10)
If necessary, install the bonding straps on the line (Ref. TASK 20-28-00-912-006).
(11)
TORQUE the unions (Ref. TASK 20-21-14-911-001).
(12)
Make sure that the line has a clearance of:
-150 mm (6.0 in.) from all hydrocarbons or combustible materials,
-50 mm (2.0 in.) from all movable components,
-150 mm (6.0 in.) from all electrical wiring or 50 mm (2.0 in.) if the wiring is rigidly supported.
NOTE : If 50 mm (2.0 in.) is not possible the wiring must have
____ additional insulation and be supported so that a minimum clearance is 13 mm (0.6 in.).
Subtask 35-00-00-865-051
D. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s): 1WR, 2WR.
Subtask 35-00-00-790-050
E. Do the leakage check of the connections (Ref. TASK 35-23-00-790-002). Subtask 35-00-00-440-050
F. 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.
Subtask 35-00-00-942-050
G. Remove the warning notice(s).
5. Close-up
________ Subtask 35-00-00-410-050
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).
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