Originally Posted by
MurphyWasRight
Gets back to the question of why 2 short blips instead of continuous until collum force approaches neutral?
Could be a DFDR artefact. On another aircraft type I am more familiar with a continuous blip when the trim motor does not run just poles the DFDR data flag on and off again. This single pole will appear as a spike when graphed.
In the accident graph the 2 final electric trim blips do not appear to move the pitch trim, either due to cutout or aerodynamics overcoming the drive.