Ground resonance

April 2, 2008 - 11:06am

Enstrom 480, Goshen, Ind., Aug. 5, 2005–The NTSB determined the landing accident was caused by “ground resonance experienced by the pilots.” The student pilot/owner was flying the turbine helicopter, accompanied by a 2,107-hour CFI, when it experienced ground resonance and disintegrated. The helicopter’s tail was sheared from the body and landed 30 feet away, the front seats about 10 feet away.

December 18, 2006 - 9:01am

Aerospatiale SA 319B, Escalante, Utah, Dec. 14, 2005–The NTSB said the probable cause of the SA 319 accident was the pilot’s inadequate remedial action when the helicopter entered ground resonance. The rough/uneven terrain and inadequate company maintenance were contributing factors.