Diamond Aircraft DV 20 KATANA, Maintenance Manual

Page: 529 / 743

AIRCRAFT
DV 20 KATANA AMM
Structures
Doc # 4.02.02
Rev. 13
51-10-00
Page 21
15 Dec 2018
7. Spar Repair
The upper and lower cap of the wing spars consist of carbon fiber rovings. In any case, the repair of
a spar is considered to be a major repair. Spar repairs, if at all possible, may only be carried out by the
manufacturer.
8. Painting
When the laminate in the repair area is hardened and cured, sand the area with no. 80 sanding paper
to remove the major unevenness. Smaller unevennesses are primed. Then use no. 150 or 320 sanding
paper to create a uniform rough surface. Clear repair area from dust, parting compounds and other
foreign substances. Apply primary coat and paint according to the paint manufacturer's instructions.
9. Repair of Cracks
%
A. Repair of Cracks Near the Entrance Steps %
In case of cracks at the entrance step area, the structure has to be reinforced. If cracks are found
%
or repairs because of cracks were already done before:
%
%
Detail Steps/Work Items % Key Items/References %
CAUTION: DO NOT DAMAGE THE COMPOSITE STRUCTURE.
%
%
(1)
%
Sand the paint coat and check the composite
%
structure.
%
%
(2)
%
In case of cracks or delamination, repair them
%
according to instructions given in the AMM.
%
%
(3)
%
Prepare the outside composite structure on a
%
250 x 200 mm (9.8 x 7.9 in) area around the
%
entrance steps attachment bolts for
%
reinforcement.
%
%
(4)
%
Apply
%
S
One layer of 92140 (±45°) 200 x 150 mm
%
(7.9 x 5.9 in) and then
%
S
One layer of 92110 (0°/90°) 220 x 170 mm
%
(8.7 x 6.7 in).
%
%
%
(5)
%
Cure, post cure and paint the reinforced area.
%%