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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
 S 286-040
 (5)  One person must go into the tank to a location near the external leak location.
 NOTE: The person out of the tank can knock on the airplane skin
____ to make it easier for the other person to find the correct location.
 (a)  The person that goes into the tank must have these items: 1) An explosion-proof flashlight 2) Non-corrosive soap solution (bubble bath) 3) Marking pen (Berol Filmograph or equivalent)
 S 286-041
 (6)  The person in the tank must apply the soap solution to a large area near the external location of the leak.
 NOTE: The internal leak can easily be as far as three feet (one
____ meter) from the external location of the leak that you found before. Examine the internal surface of the tank for loose sealant or bad sealant or a bad fastener. This can help you make a decision about where to look for the internal leak. If the external leak location is a fastener, find the fastener on the internal surface of the tank. Examine this fastener before you try to find the leak in a different location.
 (a) If the external leak location is a skin joint, examine the fillet seal on the nearest splice stringer (Fig. 601).
 NOTE: Splice stringers are stringers that cover the joints
____ of the airplane skin. There are two splice stringers in each of the wing tanks: Number 5, and number 9, (Fig. 601, 602). Faying surface seals ("isolation seals") are applied at intervals of 30 inches (760 mm) along the splice stringers. These seals are applied between the splice stringers and the airplane skin. Their purpose is to keep the length of a leak path along a splice stringer to a limit of approximately 30 inches (760 mm). Leak paths and backblowing paths do not usually go through these isolation seals.
 (b)  If the external leak location is the front or the rear spar, examine the fillet seals on the internal surface of that spar.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 (c)  If the external leak location is the boundary between the wing tank and the center tank, look for leaks in these two tanks (Fig 601).
 NOTE: It is a good procedure to put one person in the wing
____ tank and one person in the center tank. These two persons must look for internal leaks in the fillet seals on each side of the rib. Examine the full length of all of the fillet seals. It is possible for the head pressure of the fuel in the tank to cause fuel to show at an external location that is higher than the internal leak location.
 S 286-042
 (7)  The person in the tank must tell the person out of the tank when to blow air through the external leak.
 NOTE:____Agree on a system of knocks. For example, the person in the tank knocks one time to start the backblowing, two times if he finds the leak, three times if the leak is not found.
 S 286-043
 (8)  The person out of the tank must use an air supply with a nozzle to blow air through the external leak location (Fig. 604).
 NOTE: The external leak location can be a hole in the
____ aerodynamic smoother, a bad fastener, or an open seam in one of the spars, or the side-of-body rib.
 (a)  
If the leak is small, it can be necessary to use the maximum pressure (100 psi, 690 kPa).

 (b)  
If the leak is larger, it is easier to find the leak with less pressure (for example, 50 psi [340 kPa] or less).

 (c)  
Look for bubbles that show the location of the leak.

 (d)  
It is also possible to feel for blowing air to find the leak.

 (e)  
Find all leak locations on the internal surface of the fuel tank.

 NOTE: It is possible that three or four internal leaks are
____ related to one external leak location. Make a signal to the person out of the tank to stop the backblowing procedure when you find all of the leaks.
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