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 NOTE: This is not necessary if the finish is heat-cured
____ (baked-on) BMS 10-20 Type II finish material (as it is applied to a new airplane in the factory).
 The area in the fuel tank that is not heat-cured extends from
___ approximately three inches from the bottom of the fuel tank on the front spar, along the bottom of the fuel tank, to approximately three inches from the bottom of the fuel tank on the rear spar (Fig. 605A).
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 28-11-00
 ALL  ú ú 01 Page 620 ú Sep 28/01

A
757
MAINTENANCE MANUAL

 S 366-075
 CAUTION: MAKE SURE YOU CLEANED THE AREAS THAT YOU APPLY SEALANT TO.
_______ SEALANT WILL NOT ADHERE TO AREAS THAT ARE NOT CLEANED.
 (4)  Apply a thin layer (precoat) of BMS 5-26 Type II, Class A sealant with a stiff bristled brush to the area that you prepared (Fig. 606).
 NOTE: Refer to AMM 28-11-00/801 for more data about sealant
____
 preparation.

 (a)  
Use a circular motion to apply the precoat to the full repair area.

 (b)  
Make sure the sealant goes into all holes, seams, and surfaces that must be sealed.

 (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 366-017
 (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. 606).

 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. 607) to push the small fillet seals tightly into their correct position (Fig. 608). 1) Make sure all sealant fairing tools are clean. 2) Clean the fairing tools frequently with clean gauze.
 S 366-018
 (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 609. 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 609. 1) Remove all air bubbles and re-entrant fillet seal edges.

　
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