ATL83FA249

The acft was 1 of 2 that made a low pass over rwy 24. After the pass, the plt made a right turn, establishing the acft in a right traffic pattern for rwy 24. According to 1 witness, while the acft was turning on a right base, intermittent bursts of dark smoke were observed trailing from the acft. He said that when the acft turned onto final apch, the smoke trails became more destinct & numerous. The eng then began cutting out & misfiring. Subsequently, the acft turned slightly to the right & collided with a power line, then it hit trees, crashed & burned. An exam of the eng revealed the accesory case was totally destoryed & the blower case had melted to the point that the blower was exposed. Excessive heat damage & discoloration were noted at the main bearing area of the master rod & the #7 & &8 articulating rod bearings. Also, rust & the lack of oil residue was noted in these areas. Extensive fire & impact damage disrupted eng continuity & prevented rotation of the major moving parts. Temp & dew point were 92 & 70 deg.