About 0634 P.d.t, May 2, 1980, a McDonnell-Douglas, Inc., DC-9-80, N980DC, crashed
while trying to land on runway 22 at Edwards Air Force Base, California.
The aircraft was on a certification test flight to determine the horizontal distance
required to land and bring the aircraft to a full stop as required. by 14 CFR 25.125 when the accident occurred.
The aircraft touched down about 2,298 feet beyond the runway threshold.
The descent rate at touchdown exceeded the aircraft's structural limitations; the empennage separated from the aircraft and fell to the runway. The aircraft came to rest about 5,634 feet beyond the landing threshold of runway 22 and was damaged substantially.
Seven crewmembers were on board; one crewmember, a flight test engineer, broke his left ankle when the aircraft touched down.
The National Transportation Safety Board determines that the probable cause of this
accident was the pilot's failure to stabilize the approach as prescribed by the manufacturer's flight test procedures.
Contributing to the cause of the accident was the lack of a
requirement in the flight test procedures for other flight crewmembers to monitor and call
out the critical flight parameters. Also contributing to this accident were the flight test
procedures prescribed by the manufacturer for demonstrating the aircraft's landing
performance which involved vertical descent rates approaching the design load limits of the aircraft.
descent rates approaching the design load limits of the aircraft.
??? approaching...............
