Takeoff and Climb
Witnesses reported that the aircraft took off slowly, using approximately half power. The climb was sluggish, and at an altitude of about 300 to 400 feet, the aircraft began a left turn with the landing gear still extended.
Engine Sputter and Maneuver
During the initial turn, the engine was heard to sputter. Shortly thereafter, the engine sputtered a second time, at which point the aircraft turned left again and lost some altitude. While in this turn, the wing suddenly dipped down to an angle of approximately 90 degrees.
Final Descent
From the steep bank, the aircraft nosedived into the ground and exploded upon impact.
Post-Accident Investigation
Examination of the wreckage revealed that the fuel selector was positioned near the right fuel tank setting. However, the valve was only partially open. Subsequent testing showed that this partial opening interfered with fuel flow and impaired the fuel pump's ability to suppress vapor formation.