Davaar: The aileron locking you refer to was caused by a false achorage when changing from manual to power control.
If the pilot had been flying in manual control and then restored power, it caused hydaulically powered pawls to fit into slots in the aileron actuating rod.
If the pawls were not lined up with the slots, one might clamp on the rod.
The only way to correct this was to move the stick over its full travel until the other pawl engaged. Considerable force was needed to achieve this.