TRUCKEE, CA, USA
N567DA
GLASER-DIRKS DG 400/17
THE PILOT OF A SELF LAUNCHED POWERED GLIDER PERFORMED AN OPERATIONAL CHECK OF THE SPOILER PRIOR TO LANDING. THE RIGHT HAND SPOILER REMAINED DEPLOYED AFTER RETRACTION RESULTING IN AN ASYMMETRICAL LIFT CONDITION. THE PILOT WAS UNABLE TO MAINTAIN CONTROL OF THE AIRCRAFT AND COLLIDED WITH THE GROUND SHORT OF THE RUNWAY. THE CONTROL QUICK DISCONNECT SPRING PIN HAD NOT BEEN FITTED INTO THE CONTROL HOLE AS RECOMMENDED WHICH RESULTED IN THE QUICK DISCONNECT TO THE SPOILER DISCONNECTING FROM THE RIGHT HAND SPOILER ROD END BALL.
THE UNCOMMANDED DEPLOYMENT OF THE RIGHT SPOILER SYSTEM DUE TO THE ABSENCE OF A SPRING PIN NOT FITTED TO THE QUICK DISCONNECT AS RECOMMENDED WHICH RESULTED IN THE PILOT LOSING CONTROL OF THE GLIDER DURING A CRITICAL PHASE OF FLIGHT.
Source: NTSB Aviation Accident Database
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