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​A graphical depiction from Air Force Materiel Command's accident investigation board report shows the first prototype AC-130J gunship in an inverted dive prior to recovery. AIR report graphic.

​Investigators declared the first prototype AC-130J Ghostrider gunship a total loss after the airframe was severely overstressed after departing controlled flight during a test sortie from Eglin AFB, Fla., officials announced. As a result of the incident, "the mishap aircraft exceeded its design limit load to an extent that rendered it unsafe for flight and is considered a total loss to the Air Force," according to Air Force Materiel Command's Accident Investigation Board report, released on Nov. 6. The crew was performing a high-angle, side-slip at Eglin AFB, Fla., during handling tests of the developmental gunship when the aircraft departed controlled flight at 15,000 feet altitude over the Gulf of Mexico, according to the AIB. The AC-130J "tumbled inverted" before test pilots were able to recover controlled flight, entering a vertical dive, on April 21. The aircraft lost 5,000 feet altitude, pulled 3.19 Gs, and oversped the flaps' maximum allowed airspeed by 100 knots before returning to level flight. The AIB determined the pilot's excessive rudder input and failure to quickly recover from uncontrolled flight were the primar​y cause of the mishap. Problems with the aircraft's warning system, pilot disorientation, confusion from being hit with unsecured equipment, and inadequate technical guidance also contributed to the mishap. The aircraft, serial number 09-5710, also suffered a similar incident in February, and has been grounded since the April mishap. A second AC-130J prototype was delivered to commence operational testing at nearby Hurlburt Field, Fla., in July. Loss of the aircraft is estimated at $115.6 million. (See also Ghostrider Gains and Pains from the September issue of Air Force Magazine.)