Accident Sequence
The pilot conducted an unusually long engine run-up before taxiing onto the runway and performed another run-up before departure, indicating awareness of a problem. During ground run, the engines were popping and emitting black smoke. Despite these anomalies, the takeoff was continued. After liftoff, the popping and smoke persisted. A noticeable loss of airspeed occurred during the climbout. The aircraft entered a third roll (into the bad engine) and became inverted before colliding with terrain. A fire ensued.
Aircraft Information
The aircraft's allowable gross weight was exceeded by at least 205 pounds at takeoff, but the center of gravity remained within specified limits. Internal examination of the right engine revealed evidence that it had operated on a mixture of gasoline and jet fuel.
Occupants
All six occupants were killed.
Probable Cause
According to official findings, the accident involved multiple occurrences:
- Occurrence #1: Loss of engine power (partial) due to mechanical failure/malfunction during takeoff-initial climb. Findings: operation with known deficiencies in equipment (intentional by pilot in command), burned piston, improper fuel grade.
- Occurrence #2: Loss of control in flight during takeoff-initial climb. Finding: airspeed not maintained by pilot in command.
- Occurrence #3: In flight collision with terrain/water during uncontrolled descent.
- Occurrence #4: Fire.