G650 Roll-off Revealed by NTSB

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As part of its final report on the Apr. 2, 2011 crash of G650 (s/n 6002) in Roswell, New Mexico, the NTSB discussed the asymmetrical aerodynamic stall that left the two pilots without roll control as the twin-jet lifted off during a simulated single-engine takeoff.

The result was not good – the right wingtip dragged the ground, pilots were not able to recover, and the aircraft skidded off the runway and became engulfed in flames after hitting a concrete culvert. Two pilots and two flight test engineers perished.

Key to the investigation and the NTSB’s ultimate findings were two previous “roll-off” events for aircraft 6002 at Roswell, both of which were attributed to other causes at the time, but were eventually (post-accident) found to be asymmetrical stalls as well.

During the final hearing on Oct. 10, the NTSB played video clips of the two precursor events. I apologize for the low quality of the video, which was taken from the screen of my computer with my Android phone. The basic gist of the roll-off event comes across, regardless.

The first video shows the roll-off event from Flight 88 in November 2010, which was attributed to over-rotation by the pilot. The second video shows Flight 132 in March 2011. The roll-off in this case was attributed to an inoperative yaw damper and loss of directional control. 

 

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