NTSB Identification: CEN11FA431
14 CFR Part 91: General Aviation
Accident occurred Wednesday, June 29, 2011 in Howell, MI
Probable Cause Approval Date: 05/14/2014
Aircraft: BOSONETTO THORP T-18, registration: N8AL
Injuries: 2 Fatal.

NTSB investigators either traveled in support of this investigation or conducted a significant amount of investigative work without any travel, and used data obtained from various sources to prepare this aircraft accident report.

The purpose of the accident flight was for the pilot to obtain a flight review in the airplane that he owned. A witness reported seeing the airplane at a higher-than-normal glidepath to the runway and traveling at a slow airspeed while in a forward-slip maneuver. (A forward slip is a flight maneuver used to increase the descent rate, while maintaining airplane pitch and airspeed.) The witness stated that, while the airplane was in the forward slip and losing altitude, it suddenly entered a right spin and descended out of his view. Another witness reported seeing the airplane yawing side-to-side as it approached the runway and then hearing the engine increase to full power as the airplane simultaneously pitched up. The airplane then nosed over and descended into his front yard. A postaccident examination of the airplane revealed no evidence of mechanical malfunctions or failures that would have precluded normal operation. The low-altitude stall/spin encountered during final approach was likely not recoverable. Toxicological testing revealed the presence of several medications in both the pilot and flight instructor; however, it is not likely that they resulted in any impairment.

The National Transportation Safety Board determines the probable cause(s) of this accident to be:

The pilot's failure to maintain airplane control and airspeed during final approach, which resulted in an aerodynamic stall/spin at a low altitude.

Full narrative available

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