$20,000.00 BVM F-18 Twin Turbine Mid Air Crash / Break Up Due to Servo arm Spline (nylon failure) 

PLAYBACK at .25 SPEED, looks to be the left aileron started fluttering and then this spread to the right wing which then caused both wings to fail and the elevators then sheared off along with the rudder.
Reason for failure was because the servo was using a nylon (dubro) style servo arm spline; this was because the servo was upgraded from the stock spark servos. The stock arm is metal.
Metal servo arms are important for large models.
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