DG Flugzeugbau DG-800S Руководство по ремонту - Страница 12

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5.4

Repairing small dents in a sandwich panel skin (no cracks in the

gelcoat)

Small dents can usually be removed by heating up to 60° to 70° C (140° -

158°F). Use a hot air blower to heat the area of the dent. The crushed

foam will then spring back to its original form, so that the

dent will hardly be seen. Final sanding with wet sandpaper grade 600

should finish the job. In more severe cases, one coat of gelcoat will

remove all trace of the dent.

5.5

Outer skin finish

Repairs should be such that the area is exactly level or only slightly higher

than the surrounding skin surfaces. Sand the hardened repair surface with

dry grade 80 sandpaper. Fill with Polyesterfiller, let dry and sand with dry

sandpaper. When the surface is smooth, sand the repair area and at least

5 cm (2 in.) of the surrounding gelcoat with wet sandpaper grade 400.

Spray the repair area with 5 coats of gelcoat.

After the gelcoat has hardened, sand with grade 400, 600 and 800 wet

sandpaper until the surface is smooth. Polish with a power buffer (electric

drill or similar with cloth polishing wheel). Apply a block of wax onto the

rotating polishing wheel and then polish the repaired area. Do not polish

in only one direction, and do not polish one spot for too long so that

overheating occurs, see sect. "general maintenance" in the maintenance

manual.

5.6

After repairing control surfaces, the mass balance weights must be

checked again with the values given in the maintenance manual. Should

the maximum values be exceeded, then the parts have to be replaced.

Issued: April 1997

Repair manual DG-800S