Accident Sequence
Witnesses reported that the aircraft was about to touch down on runway 21 after a normal approach when it encountered variable wind conditions and ballooned to approximately 70 feet above ground level. The pilot then initiated a go-around. Shortly thereafter, witnesses observed a puff of smoke emanating from the aircraft. The pilot transmitted that the flight was 'going down'. The aircraft subsequently collided with trees on wooded terrain about half a mile from the departure end of the runway.
Post-Accident Examination
Examination of the wreckage revealed a lack of power signatures on the propeller. Evidence of sooting was found on the spark plugs, indicating a rich mixture. Testing of the turbo-controller showed that it had been adjusted to a low setting; the turbo would only produce a maximum air flow equal to high cruise power. The engine manufacturer reported that this situation could produce an over-rich mixture, particularly if the throttle and/or mixture controls were improperly manipulated.
Pilot Background
The pilot was reported to lack experience in aircraft with turbocharged engines and was not trained in accordance with the company training program.
Probable Cause and Factors
The probable cause of the accident was improper adjustment of the turbocharger absolute pressure controller, and improper manipulation of the power plant controls by the pilot during the go-around. Factors related to the accident were the failure of company management to properly train the pilot in accordance with the approved company training program, and the pilot's lack of experience in turbocharged engine operations.