TOMARK, s.r.o.
Airplane Maintenance Manual
Chapter 51 Standard Practices Structure
Page 144
Issue: 28.FEB 2017
51-70
Repair
Repairs have to be made in accordance to Part-M or Part-M light.
Other procedures for repairing individual airplane systems you can
find in the appropriate Chapter describing the system. Unless
specified otherwise in this Chapter all airplane repairs shall be done in
accordance with the procedures as approved by CS-STAN.
51-71
Repair of Metal Skins
Damage Classification
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To determine the way of repair, find out by inspection the scope of
structural damage, also in case of possible un-riveting the skin.
▶
Report any cracks found during inspection to TOMARK.
Damage can be divided into the following groups:
Small damage, which do not have to be repaired, such as local small
impacts, scratches in the skin not exceeding thickness of the zinc
chromate layer, appearance defects of paint coat etc.
Damage, which can be eliminated by airplane operator. Such are small
dents and cracks, which length/diameter is not larger than 25 mm.
Methods of elimination are described in Chapters
and
Damage with disturbance of basic structural elements of the aircraft.
(Deformation of wing and stabilizer spar, deformation of wing ribs,
fuselage bulkheads etc.). These repairs can be made only by TOMARK,
s.r.o. Aero division as producer or by authorized repair shop - for
more detailed information contact TOMARK, s.r.o.
Principles for Repair Method Determination
When repairing the damaged skin or airplane structure keep the
following principles:
▶
Drill out loose or damaged rivets and replace them with new rivets.
▶
Ensure strength in any section of the repaired place is as a minimum
equal to the strength of the original part.