Accident Description
The pilot reported departing on the second leg of a cross-country flight with an estimated 82 gallons of fuel on board. Approximately 3 hours and 30 minutes later, while turning from downwind to base with the landing gear down and locked, the pilot noticed a vibration from the left side of the airplane. An unsuccessful attempt to lower the flaps confirmed that the left engine had failed.
Being high and fast with no flaps, the pilot elected to continue the approach and land. However, over the approach end of the runway, the right engine also stopped. The pilot then attempted to force the airplane onto the runway, resulting in several bounces. The airplane made firm contact with the runway, overran the end, went off the runway, crossed an irrigation ditch, and came to rest upright in an onion field.
Post-Accident Examination
A post-accident investigation of the airplane's four fuel tanks revealed that the right auxiliary, right main, and left main fuel tanks were empty. The left auxiliary fuel tank had about 2 inches of fuel remaining. The investigation found no mechanical anomalies that would have precluded normal operation. The pilot stated that he did not know where the fuel went, only that he encountered some high winds en route to his destination.