Accident Details
During an attempted landing on a temporary runway, the aircraft collided with bushes and terrain. The temporary runway is normally the south taxiway and is used as the designated runway during major repairs to the main runway 08/26. It is marked with a displaced threshold and normal striping.
The aircraft landed prior to the displaced threshold. The instructor took control of the aircraft during the base leg turn after the student pilot expressed concerns about his ability to land due to unfamiliarity with the airport and turbulence.
The instructor reported gusty winds of 280 degrees at 9 to 14 knots, and severe windshear that was not indicated during his preflight weather briefing or by the Unicom advisory service. The Automated Weather Observing System (AWOS) was out of service.
After clearing some trees, the instructor extended an additional 10 degrees of flaps. Upon encountering a high rate of sink, he applied full power for a go-around and retracted the flaps to 10 degrees. He reported that the airplane was moving violently downward and to the left, making ground contact inevitable. The instructor stated that there were no mechanical issues with the airplane.