TOMARK, s.r.o.
Airplane Maintenance Manual
Chapter 51 Standard Practices Structure
Issue: 28.FEB 2017 Page 145
▶ Use the same material for repairs as the material of a defective area.
▶ Carry out repair of skin damaging by means of patches having the
same thickness as the original skin or higher.
▶ Repair the angle defects with inserted angles with the section by 10 to
20% higher than the section of the damaged angle.
▶ Ensure loading from one side of the repaired area is carried through
the repair element directly to the other side.
▶ Ensure length of overlapping in the area of repair is satisfactorily big
so that loading can be equally distributed to non-defective part of the
structure.
Overlapping of 2 sheets must be at minimum 2D (diameters) of used
rivet from each side as shown in the following.
▶ Use existing holes for riveted joints, if possible.
▶ If these rivets are not able to transfer loading, drill other holes.
▶ Use rivets around of the repaired area as a criterion for rivet size
selection.
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