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H. Repair the Internal Leaks
S 366-014 CAUTION: DO NOT APPLY SEALANT TO SURFACES THAT HAVE A TEMPERATURE LESS
_______ THAN 50 DEGREES FAHRENHEIT OR MORE THAN 120 DEGREES FARENHEIT. THE SEALANT WILL NOT BOND CORRECTLY TO THE STRUCTURE.
(1) Use sealant cutting tools (Fig. 604) to remove the bad sealant around the internal leak.
NOTE: If the leak is in the sealant around a sealed fastener,
____ it is usually necessary to remove all of the used sealant around the fastener and seal it again (Fig. 609).
(a) An aluminum tool is usually necessary to cut the sealant away from the tank structure.
NOTE: Aluminum is the recommended metal, but all metal tools
____ can cause dents in the fuel tank if you are not careful.
(b)
You can use a non-metallic tool to scrape away the remaining sealant.
(c)
Make sure you remove all of the loose sealant.
SCARF EDGE (SIMILAR
Fillet Seal Removal
Figure 605
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A
A
FRONT
SPAR REAR SPAR
APPROXIMATELY
3 INCHES
APPROXIMATELY 3 INCHES
FWD
AREA NOT HEAT-CURED (NOT BAKED-ON)
(CROSS SECTION OF THE FUEL TANK - EXAMPLE) A-A
Heat-Cured Finish
Figure 605A
F98449
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BMS 5-26, TYPE II, CLASS A-2 SEALANT
APPLY THE PRECOAT WITH A BRUSH
SEALING GUN
FILLET SEAL
CUT THE NOZZLE TO FIT THE SIZE OF FILLET SEAL. KEEP A BEAD OF SEALANT IN FRONT OF THE NOZZLE TIP.
Apply a Fillet Seal
Figure 606
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ST982N
Sealant Application Tools (Spatulas)
Figure 607
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