(d)  
At a fillet seal common to a rib web and the mating rib upper or lower web chord.

 (e)  
At a fillet seal common to a stringer or rib chord outboard of the outboard rib or inboard of the inboard rib, where dry bay three extends aft of the adjacent dry bays.

 S 796-175
 (7)  
The inboard rib of dry bay three separates the center tank from the main wing tank. If an internal leak point is near this rib, it can be necessary to transfer fuel from one tank to the other to find out which tank has the leak.

 I.
Dry Bay Four Aft Side (View E, Fig. 616)

 S 016-176
 (1)  
Internal access to the aft side of dry bay four is through access door 531CB or 631CB (Fig. 615).

 S 796-177

 (2)  
Find the external leak points.

 (a)  
After you find the external leak points, find the internal leak points with the air pressure and bubble procedure found in the task "Leak Detection in the Dry Bay" (above).

 (b)  
Use Fig. 616, View E to help to find the internal leak points.

 S 796-178
 (3)  
The internal leak points are most usually at one of these locations:

 (a)  
At the edge of the dry bay four access door, or at one of the door attachment fasteners.

 (b)  
At a fillet seal common to the upper or lower chord or the outboard rib or the inboard rib of dry bay four.

 (c)  
At a fillet seal common to the upper or lower wing skin and the forward or aft side of a stringer.

 (d)  
At a fillet seal common to a rib web and the mating rib upper or lower chord.

 S 796-179
 (4)  
The outboard rib of dry bay four separates the center tank from the main wing tank. If an internal leak point is near this rib, it can be necessary to tranfer fuel from one tank to the other to find out which tank has the leak.

 J.
Dry Bay Four Inboard Side (View F, Fig. 616)

 S 016-180
 (1)  Internal access to the inboard side of dry bay four is through access door 531BB or 631BB (Fig. 615).
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757 MAINTENANCE MANUAL
 (2)  S 796-181Find the external leak points.
 (3)  S 796-182After the external leak points are found, find the internal leak points with the air pressure and bubble procedure found in the task, "Leak Detection in the Dry Bay" (above).
　
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