TECHNICAL DESCRIPTION, OPERATING, MAINTENANCE AND REPAIR MANUAL
4.1 Repair outlines
Describe procedures apply to minor damages only. Major repairs can be carried out by
the aeroplane manufacturer or a repair workshop approved by local Civil Aviation
Authority ( CAA ). The sandwich shells, from which is aeroplane made, are repaired
very difficult.
4.2 Repair classification
The repairs are divided according to the influence to the airworthiness of all aeroplane
into following classes:
Repair class 1: Large damages required a partial replacement of the airframe important
or large repairs can be carried out by the aeroplane manufacturer or a
repair workshop approved by local Civil Aviation Authority.
Repair class 2: Destruction of the whole shell ( also the inner glass fiber laminate
destroyed ), however small size only.
Repair class 3: Simple surface damage ( only the outer glass fiber laminate damaged )
and small damage of the foam filling.
Repair class 4: The erosion damages caused by the scores and the scrapes without the
outer glass fiber laminate damage and without the breakage of the
element.
4.3 Construction
WT-9 Dynamic airframe consists of a sandwich shells from advanced composite
material. The shell is of three layer construction. The external and internal shell layers
are made of a glass and a carbon fiber fabrics, which are saturated with a resin. Between
them there is a filling from a hard foam panels ( Polyurethane foam HEREX 3 – 8 mm
thick ).
4.4 Materials
The following materials apply to all advanced composite material parts:
Resin : L 285 type Manufacturer Scheufler Firm
Hardener : L 286 type
Manufacturer Scheufler Firm
Mixing proportions by weight : 100 resin to 38 hardener
Mixing proportions by volume : 2 resin to 1 hardener
Date: 01.03.2002 WT-9 Dynamic Section 4 Page 4 - 2
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