What happened
Following the takeoff phase, the pilot estimated that approximately 25 gallons of fuel remained in the aircraft's tanks. The flight continued normally until a total loss of engine power occurred one hour and 55 minutes after departure. Unable to maintain altitude or reach a suitable airport, the pilot executed a forced landing on unimproved terrain.
The investigation
Post-accident examination of the aircraft revealed no evidence that any fuel had spilled from the ruptured left tank during the impact or subsequent events. To determine the cause of the power loss, mechanics drained the right fuel tank. Only three ounces of usable fuel were recovered from this tank, confirming that the engine had been starved of fuel.
Findings
The investigation concluded that the aircraft experienced fuel exhaustion. The lack of remaining fuel in the system, combined with the timing of the power failure, indicates that the pilot likely miscalculated the fuel endurance or consumption rate during the flight. The rupture of the left tank was a result of the forced landing impact rather than a pre-existing mechanical failure or leak.
Safety message
Pilots must ensure accurate fuel planning and monitoring. Estimating remaining fuel based on rough approximations can lead to critical shortages, especially during longer flights where consumption rates may vary due to wind, altitude, or engine settings.