Incident Overview
During a dual instructional flight, the pilots were practicing a simulated engine-out procedure. Engine power had been reduced to 15 inches of manifold pressure. While attempting to add power at an altitude of approximately 500 feet, the engine quit. The instructor unsuccessfully attempted a restart, and noted that during the restart attempt, the 'HI' fuel pump position was selected.
Flight Manual Guidance
According to the flight manual for the aircraft, actuation of the HI fuel pump position when the engine is operating normally may cause engine roughness and/or power loss.
Post-accident Examination
No preimpact part malfunction or failure was found during the examination of the engine and related systems. The root cause of the power loss could not be determined from the physical evidence.
Conclusion
While the event sequence suggests a possible link between the selection of the HI fuel pump position and the engine power loss, the source does not explicitly state a causal relationship. The investigation did not identify any specific mechanical or system failure.