COMCO IKARUS
Maintenance Manual C42 Series
MaintenanceManual C42-
Series_Issue_VII_18.02.2014.doc
Revison No.:1 50 from 107
4.1.3 Welded joints
There are relatively few welded joints in the C42. For example, the canopy roof frame
is a welded aluminium structure. Further welded connections are to be found on the
elevator control horn and the wing root rib.
Figure 53: Welded joints
During normal flight operations, these joints usually do not pose any problems.
However, the joints should be examined in detail after hard landings, collisions of the
wings with obstacles or similar accidents.
A visual check of the connection points for deformation and cracks at the weld seam
suffices (in case of doubt with the help of a magnifying glass). A typical sign of
excessive strain of components is a visible alteration to the anodic coating. In such
areas the anodic coating appears brighter and has numerous small cracks.
Experience has shown that the welded joints in the landing gear (axle stubs, nose
gear) are so robust that during crash landings deformation of the steel parts is more
likely to occur than damage to the weld seams.
Finally, it is emphasised that welding repairs, particularly to aluminium components
is not allowed. Only original spare parts may be used.
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