The fuel filter on the tank was dark in color and contained sediment, and debris was observed around the seal of the fuel tank. The fuel was brown in color and contained water and debris that was brown in color. Examination of the refueling tank revealed approximately one-fourth of an inch of sediment at the bottom of the tank. The CFI maintained a 55 gallon plastic refueling tank at the airport where the airplane was parked. During the post -accident examination of the engine and airframe, no mechanical anomalies were identified. The carburetor bowl, fuel inlet chamber, and fuel screen were stained and contained dirt and debris. Water was observed in both fuel tanks and in the fuel strainer. Examination of the fuel system revealed automotive fuel that was brown in color and contained debris and water. A review of information on file with the FAA Aircraft Division, Oklahoma City, Oklahoma, revealed the airplane was granted a Supplemental Type Certificate on December 12, 1984, authorizing the use of unleaded automotive fuel. The engine compartment was displaced up and aft into the cockpit area. The empennage was separated from the fuselage aft of the rear passenger seats. Buckling was observed over the top portion of the wing skin on both wings. Both wings were crushed aft and both wingtips were separated from both wings. Examination of the wreckage site the airplane came to rest upright with both wings attached to the fuselage. The airplane collided with the ground and came to rest in a field approximately 1/4 mile southeast of the departure end of runway 36. The witness stated that the airplane was then observed descending in a right bank. A witness stated that after takeoff, the airplane did not seem to gain altitude or airspeed. The certified flight instructor (CFI) took control of the airplane, and the student pilot stated that the airplane entered a right bank and the stall warning horn briefly sounded. The student pilot stated that during climb out, he heard a strange noise coming from the engine compartment. Accident investigation report completed and information captured
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