C.  
Before you repair a leak, make an analysis of the source and cause of the leak (AMM 28-11-00/601). If the cause is a result of structural damage, do the structural repair per the Structural Repair Manual before you apply sealant.

 TASK 28-11-00-308-001
 2.  Make an Analysis of the Fuel Leak Type and the Usual Repair Procedure_____________________________________________________________________
 A.  Access
 (1)  Location Zones
 133 Wing Center Section (Left)
 134 Wing Center Section (Right)
 531 Center Wing Tank (Left)
 541 Main Tank - Rib No. 5 to No. 17 (Left)
 542 Main Tank - Rib No. 17 to No. 21 (Left)
 543 Surge Tank - Rib No. 21 to No. 23 (Left)
 631 Center Wing Tank (Right)
 641 Main Tank - Rib No. 5 to No. 17 (Right)
 642 Main Tank - Rib No. 17 to No. 21 (Right)
 643 Surge Tank - Rib No. 21 to No. 23 (Right)

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 28-11-00
 ALL  ú ú 01 Page 801 ú Sep 28/01

A

757 MAINTENANCE MANUAL
 B. Make an Analysis of the Fuel Leak Type
 S 228-088
 WARNING: MAKE SURE THE FUEL LEAK DOES NOT GO INTO A CRITICAL AREA OF THE
_______ AIRPLANE, OR CANNOT GET ONTO THE FUSELAGE AREAS. FUEL LEAKS COULD CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.
 (1)  
Refer to AMM 28-11-00/601 to make a decision about the type of leak that you find.

 (a)  
Some types of leaks must be repaired immediately.

 (b)  
If there is leakage in the secondary fuel barrier, the leakage must be repaired before the airplane is released for flight.

 C.
Usual Repair Procedures

 S 368-070
 (1)  
For a bad fillet seal or fastener seal:

 (a)  
Remove the bad sealant.

 (b)  
Fully clean the surfaces.

 (c)  
Apply new sealant to make a seal of the same dimensions as the initial seal.

 S 368-071
 (2)  
For a bad faying surface seal or prepack seal:

 (a)  
Disassemble the structure or remove the fasteners.

 NOTE: Refer to the Structural Repair Manual.
____
 (b)  An alternative method is to raise the seal plane. 1) The new seal plane must isolate the bad seal from fuel. 2) You cannot raise the seal plane by a large quantity.
 NOTE: In most cases it is better to remove and replace the
____
 structure.

 S 368-072
　
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