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7) Actuate rivet gun for several minutes to force sealant around leaking rivet.
CAUTION: ALWAYS KEEP TOOL PERPENDICULAR TO WING SKIN TO PREVENT SKIN DAMAGE.
8) Check repair for leaks. If leak persists repeat the process and recheck. If rivet has to be replaced, refer to structural repair manual. 9) Clean sealant from tool and wing with B01013 solvent, Series 93 (Ref AMM/SOPM 20-30-93) taking care not to disturb freshly sealed area.
(d) Apply fillet seal to sealed fasteners.
1) Apply a precoat of properly accelerated Class A-2 sealant to fastener and area extending 1/2 inch in all directions from fastener. Use a stiff bristled brush and scrub sealant on surfaces and into crevices.
2) Allow precoat to cure until tack-free. 3) Using an extrusion gun or spatula, apply a coat of Class B sealant around and over fastener. 4) Work sealant with fairing tool until fillet seal dimensions given in Fig. 818 are obtained. 5) Carefully inspect for holes, bubbles, or voids in sealant. If any of these exist, repeat procedure. 6) Apply corrosion resistant finish (topcoat) (Ref par. 4.D. (15)) as required.
(e) Repair metal covered sealed fasteners. 1) Using a sealant cutting tool, cut around and under seal cover, to separate sealant from structure. 2) Grasp seal cover with pliers and pull up and away from fastener end. Most of sealant should be removed by this process. 3) Cut away remaining sealant. Small quantities of sealant which adhere firmly to
fastener need not be removed. 4) Clean seal covers, fastener ends, and structure area with cleaning solvent. 5) Apply precoat to area using Class A-2 sealant. Brush into crevices with smooth
strokes of brush, leaving no ridges or voids.
6) Using correct size and shape of seal cover, fill cover two-thirds full of Class B sealant with a sealing gun or clean spatula (Fig. 819). Sufficient sealant must be used to ensure extrusion around base and through hole in top.
7) Press sealant in cover to ensure no void is left. 8) Press cover down over fastener until flange on cover contacts structure (Fig. 819). 9) Fair extruded sealant around top of cover removing excess sealant. Use clean cheesecloth for wiping fairing tool.
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Dimensions of Fasteners Fillet Seals (Inches) 502
28-11-0 Figure 818 Nov 15/77
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10) Holding cover in position, fair extruded sealant around base flange. Keep cover centered over bolt. Do not let it move.
NOTE: When adjacent seal covers, structure, or sealant fillets interfere with normal application of a seal cover, up to 25 percent of the area of the cover to be applied may be trimmed around the base and up the sides to facilitate a fit. The same procedure as steps 6) thru 10) above shall be observed. Figure 820 has dimensions of finished job.
11) Apply corrosion resistant finish (topcoat) (Ref par. 4.D. (15)) as required.
(12) Apply injection seals.
(a)
Apply a new injection seal or raise seal plane to isolate faulty seal from fuel.
(b)
Apply new injection seal. 1) The following tools are required: pipe cleaners, fairing tool, and an extrusion gun
with injection nozzle attached.
2) Check that channel is thoroughly cleaned.
3) Apply a precoat of Class A-2 sealant to channel surfaces using pipe cleaners or
a long bristled pencil brush.
NOTE: Do not plug channel with Class A-2 sealant. This will prevent flow of final injection sealant into cavity. If channel cross section is 0.07-inch or less, precoat need not be applied.
4) Inject Class B sealant into one end of channel and fill until sealant emerges from all other openings. Completely fill joggles and channels that require continuity of seal or block-off seal (Fig. 821).
CAUTION: ENSURE THAT GUN HAS ENOUGH SEALANT FOR A COMPLETE SEAL AT ONE INJECTION WITHOUT STOPPING. STOPPING AND STARTING WILL CAUSE AIR BUBBLES IN SEAL AND IS CAUSE FOR REJECTION OF JOB.
5) Remove excess sealant with a fairing tool and smooth out ends of seal.
6) Inspect finished job for poor adhesion or air bubbles.
7) Sealant must be faired out gradually into area that is to be fillet sealed.
8) Apply corrosion resistant finish (topcoat) (Ref par. 4.D. (15)) as required.
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