The pilot's encounter with isolated moderate (or greater) turbulence, updrafts, and downdrafts associated with localized mountain wave conditions at low altitude, and, his failure to maintain adequate airspeed during the encounter that resulted in an inadvertent accelerated stall. Contributing to the accident were the pilot's decision to conduct low altitude flight maneuver and the pilot's diverted attention while using a cell phone.

The failure of the left turbocharger as a result of a production defect in the unit's compressor due to a machining process change by the manufacturer that was made without formal documentation or substantiation.