STOP saying the yoke “shear pin” broke. For the love of god, the system doesn’t have a yoke shear pin, the system has shear rivets at the PCUs that power the elevator, and a force breakout mechanism between the two yokes. Nothing on this airplane broke. The entire control system worked how it was designed. There is a breakout mechanism between the two yokes, not a shear pin. It’s to mitigate a control jam. When a certain amount of opposite force is applied by fo or capt, you get an elevator split.
Additionally, only captains side column position is recorded on this bird. These older cargo planes only have to record 34 parameters. If you want to “see” what the fo was doing with his controls you would have to back it out from the amount of elevator split.
stop repeating this pilot rumor nonsense that a non existent shear pin broke and the jump seater hit the ceiling. None of this is in any of the factual reports released.