The student was performing a dual-command training flight to practice landing in cross winds. After a final touch-and-go, she returned to land on unpaved runway 23.
While taxiing, after the instructor had taken back the controls and was travelling up the runway, the left main landing gear failed.
The accident was due to the failure of the attachment bolt on the left main landing gear's leaf spring as a result of fatigue cracking.
The accident occurred less than a hundred hours after the last check of the torque value of the bolts, and about 600 hours after the complete replacement of all the bolts. At the time of the accident, the complete disassembly required every 1,200 flight hours by the manufacturer was the only means of detecting an attachment with fatigue damage. The modification of the maintenance programme introduced in March 2017 by the manufacturer requires the inspection of the attachments and bolts every 100 hours which should allow a damaged bolt to be detected.
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