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 28-11-00
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E07145
A
757
MAINTENANCE MANUAL

 WARNING:_______ DO THE DEACTIVATION PROCEDURE FOR THE LEADING EDGE SLATS.
 IF YOU DO NOT DO THE DEACTIVATION PROCEDURE FOR THE
 LEADING EDGE SLATS, INJURY TO PERSONS OR DAMAGE TO

 EQUIPMENT CAN OCCUR.
 (b)  If the leak is near the front spar, extend the leading edge slats and do the deactivation procedure (AMM 27-81-00/201).
 WARNING: DO THE DEACTIVATION PROCEDURE FOR THE TRAILING EDGE FLAPS.
_______ IF YOU DO NOT DO THE DEACTIVATION PROCEDURE FOR THE TRAILING EDGE FLAPS, INJURY TO PERSONS OR DAMAGE TO EQUIPMENT CAN OCCUR.
 (c)  
If the leak is near the rear spar, extend the trailing edge flaps to get access to the area with the leak and do the deactivation procedure (AMM 27-51-00/201).

 (d)  
If the leak is near the engine dry bay, you can use the dry bay inspection procedure (AMM 28-11-07/601) to examine the dry bay for leakage.

 (e)  
If the leak is near the side-of-body rib, remove the necessary panels to get access to the external part of the fuel tank.

 (f)  
If there is leakage from the upper surface of the wing center section, look for leakage in the fillet seals in the upper surface of the wing center section, and for leakage through the secondary fuel barrier on top of the wing center section.

 (g)  
Rub the area that has the leak with cotton cloth to dry it.

 (h)  
Use a camel hair brush or a squeeze bottle to apply talcum powder to the area of the skin that contains the leak.

 (i)  
Monitor the talcum powder continuously to see where it changes color.

 (j)  
Compare the dimensions of the leak with the dimensions shown in Fig. 602 to find the type of leak.

 NOTE: Monitor the leak area with the talcum powder for
____ fifteen minutes to make sure you have the correct leak type and the correct leak position.
 1) A stain is a leak where the wetted area is not more than 1 1/2 inches wide after the time interval noted above. 2) A seep is a leak where the wetted area is not more than 4 inches wide after the time interval noted above. 3) A heavy seep is a leak where the wetted area is not more than 6 inches wide after the time interval noted above. 4) A running leak is all fuel leaks that are more than a heavy seep.
 NOTE: Fuel will usually come into view again immediately
____ after you wipe it dry, and can run or drip from the surface.
　
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