SAVANNAH, Ga. — The cause of a military plane crash that left nine people dead outside Savannah, Georgia, was pilot error, according to a report by the U.S. Air Force Accident Investigation Board.

Nine airmen from the Puerto Rico National Guard died May 2 when the plane plunged onto Georgia Highway 21 shortly after takeoff from the Savannah airport.

Brig. Gen. John C. Millard’s team spent close to a month reviewing an array of evidence including interviews, logs, video, briefing materials and inspection of aircraft wreckage before assembling a detailed sequence of events surrounding the crash.

According to the report, the left outermost engine experienced problems and investigators found that the crew’s mismanagement of the malfunction deviated from standard procedures. Failure to follow those procedures made further action by the pilot result in loss of control of the aircraft, causing it to crash.

The plane was assigned to a crew from the 156th Airlift Wing in Muniz Air Base on Puerto Rico. Their mission was to deliver the C-130 plane from Savannah to an Air Force base in Arizona commonly referred to as the “Boneyard,” where it would be decommissioned.

The pilot was previously identified as Maj. Jose R. Roman Rosado of Manati, Puerto Rico.

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