andrew 172:
"I know that jet airliners and even turboprops are designed to overcome this emergency by separating the control columns....."
Not true! The DC-10 had no such facility for all controls were hydraulic. The Bae 146 had a disconnect handle for the elevators and the ailerons (the rudder was hydraulic) but that was only because BAe designed those controls to be operated by old-fashioned bowden cables running to servo tabs.
Which other jet airliners do you know of that have this facility?