sentences:  The complexity of the aviation environment demands a foundation of solid airmanship, and a healthy, positive approach to combating pilot error.The actions of Captain Alfred C. Haynes and the crew of United Airlines Flight 232 are often cited as an exemplar of good airmanship.They were able to maintain control of their crippled McDonnell Douglas DC-10, bringing it to a survivable "controlled crash" in Sioux City, Iowa, after a complete loss of all flight controls following an engine failure in July 1989.