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There were 2 main fails during the flight - open carabineer and flying without a helmet. Carabineer wasn't old according to its specification. The reason why it bended is that, carabiner was not closed before take off. Pilot checked carabiner visually, unfortunately it was frozen, it looked sealed but it was open. 1st Mistake: Preflight check should be done more carefully. 2nd Mistake: Pilot should have noticed bent carabineer and should have stopped making maneuvers. 3rd Mistake: Pilot wasn't supposed t
