CHAPTER 57
PAGE 3
PAGE DATE: 7. July 2010
MAINTENANCE MANUAL EXTRA 300LT
57-00-00 GENERAL
The wing consists of a one-piece, dual chamber main spar
with carbon fibre roving caps and carbon fibre webs. For the
spar core PVC foam is used. The wing shells are a honeycomb
sandwich construction with carbon fibre laminates. To pre-
vent buckling of the shells, plywood ribs are used.
The layer sequence of the wing D-section is shown in
figure 1.
For protection against moisture and UV radiation all
composite parts are coated with an unsaturated polyester
gel-coat, an acrylic filler and finally with an acrylic paint.
For repair of composite parts refer to chapter 51.