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A report was received concerning a broken bell-crank, installed in the air brake
control circuit approximately 1.4 m outside the wing root rib of a GROB G 103
Twin II sailplane. Preliminary investigation results revealed additional cases of
cracks on the same part, installed in the air brake control systems of the early
Twin II type design.
The same bell-cranks are also installed at the same location in the control
systems of other models belonging to the same type design (see list of affected
models under Applicability).
This condition, if not detected and corrected, could lead to failure of t