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757
MAINTENANCE MANUAL

 (f)  
There are no seals on the external side of the seal plane and fuel that goes through the seal plane follows the path of least resistance. 1) For example, a row of fasteners in a groove are wet but

 only one fastener has a leak. 2) If the fastener with the leak is sealed, then the fastener with the next least resistance leaks.

 (g)  
If you examine the leak path you can see how fuel gets from the internal leak source to the external leak point.

 (h)  
To understand the leak, examine the fuel tank structure and sealant.

 TASK 28-11-00-796-105
 8. Dry Bay Leak Detection and Repair Aids
______________________________________
 A. Outline: Leak Detection
 S 796-125
 (1) Find the internal Leak point before you try to do the repair.
____________________________________________________________
 (a)  
Make sure there is fuel in the tank.

 (b)  
Find the external leak point and mark its location.

 (c)  
Do these steps to go into the tank: 1) Drain the tank. 2) Do the purging and entry procedure. 3) Go into the fuel tank.

 B.
Outline: Leak Repair

 S 366-126
 (1)  
Remove the bad sealant.

 S 366-185

 (2)  
Carefully clean the area to be sealed.

 S 366-127

 (3)  
Choose an approved fuel-resistant sealant.

 S 366-128

 (4)  
Mix the sealant.

 (5)  
Apply the sealant.

 (6)  
Permit the sealant to cure.

 (7)  
Close the tank.

 (8)  
Refuel the tank and examine the external leak area.

 S 366-129
 S 366-130
 S 416-131
 S 796-132
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MAINTENANCE MANUAL

DRY BAY BOUNDARIES 
DRY BAY  FORWARD  AFT UPPER  AFT LOWER 
DRY BAY 1  FRONT SPAR  S-18U  S-12L 
DRY BAY 2  FRONT SPAR  S-18U  S-12L 
DRY BAY 3  FRONT SPAR  S-16U  S-11L 
DRY BAY 4  FRONT SPAR  S-18U  S-12L 

Dry Bay Locations
Figure 614

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