Back in 70s we had 2 cases of locked ailerons ( control lock was 2 bits of wood and a bolt holding them together with a big red flag attached located in the gap between the end of the aileron and the wing tip) the aircraft was the PL12 Airtruk and in both cases a very wide circuit was carried out using the twin rudders and elevators to control the aircraft and a successful landing carried out much to the skill of the AG pilots who failed to notice the big red flag fluttering in breeze during the pre-flight walk around and the full and free control check before take-off (true story)