Date: September 02, 1995
Time: 08:38
Location: Beaver Dam, Arizona
Operator: Adventure Airlines
Flight #: ?
Route: Las Vegas, NV - W. Yellowstone, MT
AC Type: Cessna 421C Golden Eagle
Registration: N6234G
cn / ln: 421C-0265
Aboard: 8   (passengers:7  crew:1)
Fatalities: 8   (passengers:7  crew:1)
Ground: 0
Summary: After climbing to 18,400' msl, the pilot reported a turbocharger problem & reversed course. He said he 'may lose the left engine' & that he was unable to maintain altitude. He diverted to an alternate airport. During a right turn onto final approach, the airplane was observed to cross (overshoot) the extended centerline of the runway. It continued in a right turn back toward the centerline, and then entered a left turn to intercept the inbound course. The turn steepened, and then the airplane entered a spin & crashed 1/2 mile short of the runway. Failure of the pilot to maintain adequate airspeed, while maneuvering on approach, which resulted in an inadvertent stall/spin and uncontrolled collision with terrain. Factors relating to the accident were: the pilot allowed the aircraft weight and balance limitations to be exceeded; the pilot's lack of recurrent training in the make and model of airplane; inadequate maintenance/inspection of the engine exhaust systems; a warped and leaking exhaust system flange on the left engine, which resulted in a loss of power in that engine; and the pilot's improper use of the flaps.

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