CHAPTER 51
PAGE 32
PAGE DATE: 7. July 2010
MAINTENANCE MANUAL EXTRA 300LT
Subsequently scarf the edges of the damaged portion with
sandpaper. Minimum lenght of scarf per fabric layer approx.
20 mm;
I M P O R T A N T ratio (laminate thickness : scarf lenght) approx. 1: 50.
Following the scarf procedure, clean the repair area thor-
oughly:
1 Remove the sanding dust with a pneumatic vacuum
cleaner.
2 Clean the scarfed overlaps with carbon-tetrachloride or
acetone in case dirt or grease was introduced during the
preparation of the overlap.
I M P O R T A N T Repair area must be free of dirt, dust and grease.
Wet all surfaces of the backing plate and the scarfed area with
resin mixture. Lay on prelaminated fabric layer in accordance
to the layer sequence plan. Ensure correct style and direction
of fabric.
N O T E Lay out the required number and size of fabric pieces
on a piece of colored plastic foil and wet them with
resin mixture. Subsequently position them on the repair
area.
I M P O R T A N T Remove the plastic foil after each positioning process.
The repair area has to be cured under condition of vacuum
bagging. Proceed as follows:
1 Apply peel nylon fabric on the last repair fabric layer.
2 Perforate a clean, thin plastic foil with a coarse needle
(max. spacing of holes: 20mm x 20mm) - mainly in the
area of the honeycomb - and lay it on to the repair area.
3 Lay a jute cloth or equivalent bleeder cloth on this
perforated plastic foil.
4 Lay an air tight plastic foil upon the jute weave and seal
their edges to the surrounding surface using an adhesive
tape.
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