The Accident
During a simulated forced landing, the aircraft was descended from 3,000 ft AGL with the throttle at idle, full flaps, and carburetor heat on. While turning 180 degrees at approximately 300 ft AGL, the CFI raised the flaps, and the stall warning horn activated. The aircraft developed a high sink rate, and the CFI reached to advance the throttle but found it already advanced. The engine reportedly did not respond, and the aircraft descended to the ground, colliding with a corn field.
Post-Accident Engine Examination
After the accident, the engine was test run. It ran rough on the left magneto. Examination revealed that the distributor block and bearings were worn.