What happened
On April 2, 2011, an experimental Gulfstream Aerospace Corporation G650, registration N652GD, was involved in a fatal accident during a flight test operation at Roswell International Air Center in New Mexico. The aircraft, which was being operated by Gulfstream as part of its G650 flight test program, was performing a scheduled one-engine-inoperative takeoff from runway 21.
During the takeoff phase, the aircraft experienced a stall on the right outboard wing. This aerodynamic event created a rolling motion that the flight crew could not counteract. As a result, the right wingtip struck the runway, causing the aircraft to veer off the right side of the runway. After leaving the paved surface, the plane struck a concrete structure and an airport weather station. The impact and the subsequent fire caused extensive damage, completely destroying the fuselage and the cabin interior. There were four fatalities among the crew, consisting of two pilots and two flight test engineers.
Findings
Investigation into the accident determined that the primary cause was a stall on the right outboard wing during the one-engine-inoperative test procedure. This stall induced an uncontrollable rolling moment that led to the loss of directional control and the subsequent runway excursion and impact.