An Asiana Airlines Inc. captain nervous about making a manual landing in San Francisco inadvertently disabled a speed-control system before the plane crashed into a seawall on July 6, documents show. Lee Kang Kuk, a veteran pilot with Seoul-based Asiana who was being trained on the Boeing Co. 777-200ER wide-body, had momentarily adjusted the power without realizing the plane’s computers then assumed he wanted the engines to remain at idle, according to information released today at a U.S. National Transportation Safety Board hearing. The documents, while showing the pilots made errors, raise questions about how auto-throttles on Boeing planes are...