NTSB Identification: WPR09LA308
14 CFR Part 91: General Aviation
Accident occurred Tuesday, June 23, 2009 in Cottonwood, AZ
Probable Cause Approval Date: 09/19/2011
Aircraft: Mayo RV-6A, registration: N413RV
Injuries: 2 Fatal.

NTSB investigators may not have traveled in support of this investigation and used data provided by various sources to prepare this aircraft accident report.

Witnesses reported hearing the accident airplane's engine sputter during the takeoff climb. The airplane's nose appeared to pitch down, level, then witnesses heard a high pitch revving sound emanating from the engine. The airplane rocked back-and-forth, the left wing dropped, and it entered a nose dive before impacting the ground. A postaccident inspection of the accident site revealed the airplane impacted the ground in a nose down attitude, with the propeller assembly separating from the crankshaft and becoming embedded in the hard desert dirt. An examination of the airplane and engine revealed no mechanical anomalies that would have precluded normal operation.

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

The partial loss of engine power for undetermined reasons, and the pilot's failure to maintain an adequate airspeed, which resulted in an inadvertent stall/spin.

Full narrative available

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