Old Airplane with Control Problem
About ten years ago, the Roll Channel went to sleep on an Evergreen 747-1 cargo plane one night over Canada enroute KJFK-KANC. It was well beyond 30 degrees roll when the pilot caught it. They went something like 1.06 M in the recovery.
SperryWell could find nothing wrong with the roll channel, so it became a boat anchor. EV installed 30 degree bank limit alarms in the fleet after that.