Engine Failure and Forced Landing
An aircraft lost engine power at 600 feet above ground level (AGL) during a ferry flight for electrical maintenance. The pilot executed an autorotation to a forced landing in a corn field. The pilot reported to an FAA inspector at the scene that 8 gallons of fuel remained. However, when the fuel tank was drained, only approximately 6 ounces of fuel was found.
Fuel and Flight Details
The pilot had made this trip before but never with a large spare fuel tank attached under the fuselage, which created considerable drag. According to the pilot, normal fuel burn-out time was 2 hours 45 minutes to 3 hours. This flight lasted two hours.
Post-Crash Investigation
No evidence was found to indicate any discrepancies in the aircraft powerplant during the investigation. Post-crash examination revealed that the battery relay was inoperative. No special permit had been obtained for the maintenance flight.
Conclusion
The aircraft was being ferried for electrical maintenance when the engine failed. The investigation found no mechanical issues with the engine, but the fuel tank was nearly empty.