In the picture of the aircraft's cockpit is possible to see both Flight Directors' Mode Select Panels (I don't remember the nomenclature on the 76) and AL 300 displays on the front panel, instead of in the center console. So, I don't think a passenger could have decoupled without pilot notice, considering the other way to do so is pressing a button on the cyclic.
Last edited by Jimmy.; 10th Feb 2020 at 16:12.