The crash of a US Air Force Reserve Lockheed Martin HC-130P into the Pacific Ocean on 22 November 1996 was caused by fuel starvation, but the official investigation could not determine why all four engines had shut down.
One of 11 crew members survived when the aircraft crashed off the northern California coastline. The Hercules had left Portland International Airport in Oregon for North Island Naval Air Station on a routine over-water navigation training mission.
The crash investigation says: "There is insufficient clear and convincing evidence to determine the ultimate cause of this accident. However, the accident resulted from fuel starvation to the engines- The cause of the fuel starvation is unknown."
Source: Flight International