(c)  
Make sure the area where you apply the precoat is a minimum of

 0.1 inches larger than the area of the fillet seal.
 S 366-048
 (5)  Apply the first layer of a new fillet seal of BMS 5-26, Type II, Class B sealant with one of these procedures:
 (a) Use a sealant gun to apply a small fillet seal (Fig. 609).
 NOTE: Point the nozzle tip into the seam, towards the
____ direction of travel. Keep a bead of solvent in front of the nozzle tip.
 (b)  Use a sealant fairing tool (Fig. 608) to push the small fillet seals tightly into their correct position (Fig. 609). 1) Make sure all sealant fairing tools are clean. 2) Clean the fairing tools frequently with clean gauze.
 S 366-049
 (6)  Apply BMS 5-26, Type II, Class B sealant to make a second (full bodied) fillet seal with one of these procedures:
 (a)  
Use a sealant gun with the nozzle cut to the dimensions in Figure 610. 1) Push the nozzle head against the surface to make sure the

 fillet seal is thickest in the middle of the surfaces. 2) Keep the nozzle of the sealant gun near the surface to prevent air bubbles in the seal.

 (b)  
Use the necessary sealant fairing tools to make a second fillet seal with the dimensions in Figure 610. 1) Remove all air bubbles and re-entrant fillet seal edges.

 S 376-066
 (7)  If it is necessary, do this Task: Application of Corrosion Resistant Finish (Topcoat) (AMM 28-11-00/701).
 NOTE: A layer of corrosion resistant finish is necessary only
____ to protect bare (anodized) metal. It is not necessary to apply a layer of corrosion resistant finish on sealant. Corrosion resistant finish can be applied on sealant, but it is not necessary. Usually topcoat is applied to sealant only when it must be applied to protect adjacent bare metal.
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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737-300/400/500MAINTENANCE MANUAL
 S 366-051
 (8)  
Make sure you do the repair procedure for all internal leaks that you found with the backblowing procedure.

 S 306-224

 (9)  
If leakage was found in the upper surface of the wing center section, you must also repair the secondary fuel barrier (AMM 28-11-00/801) before you release the airplane for flight.

 S 366-052

 (10)
 Permit the sealant to dry for the applicable tack-free time before you close the fuel tank (AMM 28-11-00/801).

 NOTE: You can increase the temperature and the relative
____ humidity to decrease the cure time. Do not increase the temperature to more than 120 degrees Fahrenheit (49 degrees Celsius). If there is fuel in the tank adjacent to the repair area, you can defuel that tank to increase the temperature of the repair area.
 J. Close the Repaired Fuel Tank
 S 946-053
 (1)  
Remove all of the equipment that you put into the tank (for example, tools, solvent containers, plugs, brushes, and other equipment).

 S 166-054

 (2)  
Clean the repaired fuel tank fully to remove unwanted particles and pieces of used sealant.

 S 166-055

 (3)  
Make sure there is no blockage in the fuel and water drain holes and paths.

 S 216-056

 (4)  
Do a final inspection of the fuel tank to make sure you removed all unwanted materials and equipment.

 NOTE: Make sure the necessary approved persons do an inspection
____
 of the tank before you close it.

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737-300/400/500MAINTENANCE MANUAL
 S 416-057
 (5)  Install all of the fuel tank access doors that you removed
 (AMM 28-11-11/401, AMM 28-11-31/401).

 K. Put the Airplane Back to Its Usual Condition
　
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