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A 737-300/400/500MAINTENANCE MANUAL
CLASS A-2
Application of Precoat
Figure 804
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737-300/400/500MAINTENANCE MANUAL
S 398-254
(6) Do these steps to repair bad fastener seals (SRM, 51-00-00/001) if it is necessary:
(a) Apply a precoat of BMS 5-26, Type II, Class A-2 sealant (correctly mixed) to the fastener and to the area 0.5 inch in all directions from the fastener.
NOTE: Precoat is optional when you use Pro-Seal 860, B 1/6
____ sealant. Precoat is not used with PR-1826 or PR-1828 sealant.
1) Use a stiff, bristled brush to apply the precoat on the surfaces and into the cracks and holes.
(b)
Let the precoat dry until it is not tacky.
(c)
Apply a layer of BMS 5-26, Type II, Class B or Pro-Seal 860, B 1/6 sealant around and on the fastener.
NOTE: Use a sealant gun or a spatula.
____
Apply a Fillet Seal
Figure 805
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PUSH SEALANT TIGHTLY INTO THE SEAM
Push the First Fillet Seal into the Seam
Figure 806
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(DO NOT PUT A BRIDGE ABOVE IT)
Re-Entrants Fillet Seal and Dimensions of Full Bodied Fillet Seals
Figure 807
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(d)
Move the sealant with a sealant fairing tool until you get the dimensions shown in Fig. 808 for the fillet seal.
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