Primary finding
Probable cause
The airplane's encounter with a sunken area during takeoff from a turf runway, which resulted in the airplane becoming prematurely airborne and impacting a tree and then terrain.
Investigator assessment
Analysis narrative
The pilot reported that the turf airstrip had a "sunken area," which created a "ramp." During takeoff, the airplane encountered this portion of the airstrip and became "airborne prematurely." The airplane subsequently settled into ground effect; however, the left wing impacted a small tree near the end of the runway, and the airplane then pitched "downward and left," and the airplane was unable to maintain altitude. The airplane impacted a field off the end of the runway. The airplane sustained substantial damage to the wings and fuselage. The pilot reported that there were no preaccident mechanical malfunctions or failures with the airplane that would have precluded normal operation.
Source record
Factual narrative
The pilot reported that the turf airstrip had a "sunken area" which created a "ramp." During takeoff, when the airplane encountered this portion of the airstrip, it became "airborne prematurely." The airplane subsequently settled into ground effect; however, the left wing impacted a small tree near the end of the runway. The collision caused the airplane to pitch "downward and left" and the pilot was unable to maintain altitude. The airplane came to rest in a muddy rice field off the end of the runway with damage to the wings and fuselage.