NTSB Identification: CEN13LA376
14 CFR Part 91: General Aviation
Accident occurred Tuesday, June 25, 2013 in Grand Rapids, MN
Probable Cause Approval Date: 06/02/2014
Aircraft: AVERY JACK H GLASTAR GS-1, registration: N103A
Injuries: 1 Serious.
NTSB investigators may not have traveled in support of this investigation and used data provided by various sources to prepare this aircraft accident report.
Prior to takeoff from the airport pond, the pilot performed a few high-speed taxi and on-the-step maneuvers with no anomalies noted. After the flight and during the short flight to the intended landing area, the pilot heard two to three aural “autopilot disconnect” voice messages. Because the pilot believed he did not engage the autopilot during the flight, he was uncertain why he was hearing the autopilot disconnect messages and was not overly concerned. During the landing, after the floats contacted the water, the airplane's right wing immediately lifted up, and the left wing tip contacted the water. Subsequently, the airplane nosed over. The pilot reported the weather at the time of the accident as ideal for flying; sky clear and a steady 5-knot wind. Data extracted from the avionics units showed 9 autopilot engagements during the flight; however, the data did not show what caused the inadvertent engagements. It is likely the autopilot engaged during the attempted landing and caused the loss of directional control, but the reason for the autopilot engagement was not determined due to damage to the avionics system caused by water exposure and recovery damage.
The National Transportation Safety Board determines the probable cause(s) of this accident to be: The loss of directional control during landing because the autopilot engaged for undetermined reasons because water and recovery damage precluded detailed examination of system components. Full narrative available
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