Several occurrences of airbrake torque tube failure were reported on SZD-50-3
“Puchacz” sailplanes. In all cases, as a result of disruption of the welded joint
between torque tube and the lever, the broken torque tube detached from the
lever located in the fuselage. The result of subsequent investigations identified
fatigue damage, as a consequence of periodical striking load exceeding the
established maximum value, to be a possible failure cause. Additionally,
corrosion damage was identified at internal surface of the opened tube.
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