TM 55-1520-240-23-45-81.3REPAIR LIGHTNING PROTECTION STRIP UNBONDING(Continued)5-81.31.Find size of unbonded area (1). Use shim 0.005inch thick. Outline unbonded area. Use chalk(E111). Voids that do not reach edge requireno repair.2.Remove adhesive fairing (6) next to unbondedarea (1). Use utility knife.3.Apply Teflon tape (E399) (2) to lightningprotection strip (3) in unbonded area (1).4.Cut aluminum foil (E366) (4) to outline shape ofunbonded area (1). Secure foil with Teflon tape(E399) (5).5.Open unbonded area (1). Use shim 0.005 inchthick.6.Have helpers position blade (7) so unbondedarea (1) is lower than lightning protection strip (3).Acetone (E20) is extremely flammable.It can be toxic. Avoid inhaling. Useonly with adequate ventilation. Avoidcontact with skin, eyes, or clothing.Keep away from heat, sparks, or openflame. In case of contact, immediatelyflush skin or eyes with water forat least 15 minutes. Get medicalattention for eyes.7.Flush unbonded area (1) with acetone (E20) untilacetone runs clear. Use squeeze bottle (E366).Wear gloves (E186). Allow to dry for 15 minutes.NOTEPrepackaged adhesive (E40) ispreferred. Use adhesive (E41 orE47.1) only if prepackaged kit is notavailable.8.Mix tube of adhesive (E40). Follow instructionson kit.9.If adhesive (E40) is not available, prepareadhesive (E41) as follows:a.Weigh 100 parts of resin and 23 parts ofhardener. Use trip balance.b.Mix parts in polyethylene cup (E157) untilcolor is uniform. Use wood spatula (E424).NOTEWorking life of adhesive is 30minutes.5-475
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