Initial Events
The pilot had returned from an earlier departure due to smoke inside the airplane. He requested mechanic assistance but could not obtain it. He borrowed pliers from the FBO and inspected the airplane himself. Afterward, he returned the pliers and commented about the EGT probe to a line person.
Second Departure and Accident
Soon after the second departure, the airplane was seen returning toward the airport, trailing smoke and possibly fire. The airplane then rolled inverted and descended into trees.
Investigation Findings
The airport manager who responded to the scene located the exhaust tailpipe. A fractured turbo clamp was found at the wreckage. Metallurgical analysis determined that the cracking resulted from intergranular corrosion. Additionally, the turbocharger had been removed, repaired, and reinstalled on September 26, 1990.