While I was at Boeing working on the 757, I heard a story that there was an L-1011 flight where all three elevator actuators froze due to ice buildup in a nose-up attitude. The pilot got on the horn and asked all the passengers to move forward as far as possible to get the nose down. He then landed the airplane using differential thrust on the 3 engines to control pitch. It was a feat of airmanship famously repeated years later on UA Flight 232 (though the beleaguered FL232 pilots didn&#x27;t have yaw or roll control, either).<p>Since part of my job was working the 757 elevator actuators, icing was a huge concern. The systems are designed to drain off any water accumulation, slough off ice or simply power through it.