What happened
The accident occurred during a training flight when the aircraft collided with power lines and crops following a loss of power. The crew consisted of a certified flight instructor (CFI) and a student pilot conducting a cruise phase exercise designed to simulate a single-engine failure. To initiate the simulation, the CFI leaned the right engine's fuel mixture to establish a 'zero' thrust condition.
The student pilot was then tasked with configuring the aircraft for a single-engine approach to the Richmond, Indiana airport. As the student struggled to maintain the required airspeed and altitude, the CFI assumed control of the throttle quadrant by moving all levers forward. The instructor verbally directed the student to ensure all switches on the left side were in the 'up' position.
When power could not be restored, the CFI lowered the landing gear and flaps. The aircraft subsequently flew through power lines before making an emergency landing in a cornfield. Both pilots reported that they experienced partial power in the right engine and complete failure in the left engine during the event.
The investigation
Examination of the wreckage provided critical mechanical insights into the cause of the power loss. Investigators found a small amount of water in both carburetor bowls, indicating potential fuel contamination or moisture ingress. Additionally, a left magneto was discovered installed on the right engine. This specific component was not authorized for use on this aircraft type and failed to produce a spark during post-accident testing.
Findings
The combination of water in the carburetors and the installation of an unauthorized magneto on the right engine contributed significantly to the loss of power. The inability to restore thrust during the critical approach phase forced the crew to execute an off-airport landing. The incident highlights the risks associated with improper maintenance parts usage and fuel system contamination during training maneuvers.