(1)
Make sure the area around the leak is clean and dry.
(2)
On the external surface of the fuel tank, attach a suitable artificial chamber over the leak area with BONDING AND ADHESIVE COMPOUNDS (Material No. 08-052).
NOTE : The artificial compression chamber is made from a suitable
____
plastic bag.
(3)
Attach the helium supply pipe to the artificial compression chamber with BONDING AND ADHESIVE COMPOUNDS (Material No. 08-052).
(4)
Connect the helium supply that can deliver 0.2 bar (2.9 psi) to the artificial compression chamber.
4. Procedure
_________
Subtask 28-11-00-790-070
A. Leak Test
(1)
Supply helium to the artificial compression chamber at a constant pressure of 0.2 bar (2.9 psi).
(2)
Seal all helium leaks with the aluminium tape.
(3)
Inside the tank use the leak detector to find the internal leak point. Start at a position that is opposite the external leak and move the detector along adjacent stringers and ribs, until the exit for the helium is found.
NOTE : A fuel leak can track for a long distance in the aircraft
____
structure.
(4) Do the necessary repair procedure (Ref. TASK 51-76-12-300-001).
1EFF : ALL 1 28-11-00Page 571 1 1 May 01/04 1 1 1CES 1
5. Close-up
________ R **ON A/C 001-049, 051-099, 101-149, 151-199, 201-299, 401-499,
Subtask 28-11-00-410-075
A. Close Access
(1)
Make sure that the work area is clean and clear of tool(s) and other items.
(2)
Close the access to the applicable fuel tank (Ref. TASK 28-10-00-910-002).
(3)
Install the applicable fuel tank access panels (Ref. TASK 57-27-11-400-001) (Ref. TASK 57-27-11-400-002) (Ref. TASK 57-17-11-400-001).
(4)
If applicable, install the wing leading-edge access panels.
(5)
If applicable, install the wing trailing-edge access panels.
(6) If applicable, install the belly fairing access panels.
**ON A/C 301-399,
Subtask 28-11-00-410-075-A
A. Close Access
(1)
Make sure that the work area is clean and clear of tool(s) and other items.
(2)
Close the access to the applicable fuel tank (Ref. TASK 28-10-00-910-002).
(3)
Install the applicable fuel tank access panels (Ref. TASK 57-27-11-400-001) (Ref. TASK 57-27-11-400-002) (Ref. TASK 57-17-11-400-001).
(4)
If applicable, install the wing leading-edge access panels.
(5)
If applicable, install the wing trailing-edge access panels.
(6)
If applicable, install the belly fairing access panels.
1EFF : ALL 1 28-11-00Page 572 1 1 Aug 01/05 1 1 1CES 1R **ON A/C ALL
Subtask 28-11-00-860-075
B. Aircraft Maintenance Configuration
(1) Refuel the applicable fuel tanks (Ref. TASK 12-11-28-650-003).
(2) If applicable, retract the flaps fully (Ref. TASK 27-50-00-866-009). Subtask 28-11-00-942-095
C. Removal of Equipment
(1)
Remove the access platform(s).
(2)
Remove the ground support and maintenance equipment, the special and standard tools and all other items.
(3)
Remove the warning notice(s).
1EFF : ALL 1 28-11-00Page 573 1 1 May 01/04 1 1 1CES 1 TANKS - INSPECTION/CHECK
________________________
TASK 28-11-00-200-001
R Check for Full and Free Movement of Clack Valves
WARNING : PUT THE SAFETY DEVICES AND THE WARNING NOTICES IN POSITION BEFORE YOU
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