Originally Posted by
lefty loose
The video appears to show the aircraft being towed in a series of more ‘jerky’ movements until the nose undercarriage retracts and causes the tow bar shear pin to do its job and break at a pre-determined load. The resultant investigation will determine If the cause was a tug problem or aircraft brake problem (possibly intermittent anti-skid) If serviceable aircraft brakes were ‘on’ I doubt the tug would have been able to move the aircraft.
By the look of the two continuous black lines from the rear tyres in the OP video, it looks like the rears were well and truely locked on for a good while.