28-11-00
ALL ú ú 01 Page 809 ú Mar 20/94
A
757
MAINTENANCE MANUAL
MATERIAL - MILD STEEL CADMIUM PLATED
Sealing Tool for Rivets that Leak
Figure 802
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28-11-00
ALL ú ú 01 Page 810 ú Mar 20/94
C76307
A
757
MAINTENANCE MANUAL
S 158-034
(3)
Use the sealant cutting tools (Fig. 801) and remove the bad sealant.
(a)
Cut the bad section away from the fillet seal (Fig. 803). 1) Cut the ends of the bad section at a slope such that the
new sealant makes an overlap with the remaining sealant. 2) Make sure you cut the seal smoothly.
(b)
If the fillet seal bond is good, it is not necessary to cut the sealant to the bare metal. 1) Make sure you remove all loose sealant.
(c)
If the bad sealant includes fasteners with fillet seals, do the steps that follow: 1) Cut around the base of the fastener with a sealant cutting
tool (Fig. 801). 2) Use a pliers and pull the sealant from the fastener.
NOTE: It is not necessary to remove small quantities of
____ sealant that bond to the fastener.
(d) If an injection seal is bad, do the steps that follow:
1) Remove the bad sealant from short injection channels with hooked wire and small cutting tools.
NOTE: You must disassemble long injection channels (Ref
____ Structural Repair Manual). You can repair bad injection seals if you raise the seal plane to isolate the bad seal from the fuel.
2) Make sure the injection channel is completely clear.
NOTE: If air is caught in the injection channel, new
____ sealant cannot completely fill the channel.
3) Be careful not to damage the tank structure.
S 368-007
(4)
For bad prepack or faying surface sealant, do these steps:
(a)
Disassemble the structure around the defective sealant (Ref Structural Repair Manual). 1) If you do not want to disassemble the structure, you can
repair the leak if you raise the seal plane to isolate the defective sealant from the fuel.
NOTE: The area of defective sealant must be small.
____
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