Extra 200 - Page 267

CHAPTER 51
PAGE 24
EXT
RA - FLUGZEUGBAU GmbH
SERVICE MANUAL EXTRA 200
PAGE DATE: 1. July 1996
Damage of Complete Sandwich
Figure 8
Lay out the required number and size of fabric pieces on a
piece of 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:
- Apply peel nylon fabric on the last repair fabric layer
- Perforate a clean, thin plastic foil with a thick needle
(max. spacing of holes: 20mm x 20mm) - mainly in the
area of the honeycomb - and lay it on the repair area.
- Lay a jute cloth or equivalent bleeder cloth on this
perforated plastic foil
- Lay a second plastic foil upon the jute weave and seal
their edges to the surrounding surface using an adhesive
tape.
- Apply suction with a vacuum pump (pressure approx.
0.7bar / 10psi)
- Apply the thermal curing cycle
- Following the curing cycle carefully remove vacuum
bagging material and peel nylon fabric.
N O T E After the pre-curing period at room temperature, the
repaired area has to be cured according the tempera-
ture cycle as shown on Figure 6.
After the curing process is completed, the repair area can be
sand level to the surrounding area.
I M P O R T A N T Sand only the edge thickness of repair laminate!
REPAIRS
Repair of Sandwich Material