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Document No.: 304S/MM
Date of Issue:
08/14
6-6
H
P
H
Ltd.
6.5 Basic Techniques and Tools
ATTENTION !
You should NOT make any repair yourself (for specification please see ch. 3.6)
:
1. If the wing main spar is damaged.
2. If main fittings in wings, fuselage or tailplane are torn out; or if around such
fittings white overstressed areas are visible in the normally green fiberglass
laminates.
3. If parts are so torn up that - without the aid of original tools, jigs or moulds -
you are not able to restore their exact shape or position.
4. If it is unavoidable to remove undamaged laminated areas in order to carry
out a repair.
5. If you can't guarantee that your repair will be technically perfect and
airworthy.
6. If it's less expensive to purchase a replacement part.
7. If areas with load carrying reinforcements are damaged as in most cases the
number of glass layers shown at the point 6.2 is not true.
6.5.1 Fiberglass-Hard foam-Sandwich Skin
( wings, horizontal and vertical stabilizer, rudder and ailerons)
In these components there is one layer of hard foam between the outer and
inner skin.
Usually there are two kinds of damage:
A) Only the outer skin and the foam below is damaged while the inner skin is
unhurt
FIG. 37
or
B) The damage affected the inner skin too
FIG. 38
