to the similar nature of the circumstances. During the NTSB's renewed investigation, it was determined that the crash of Flight 585 (and the later Flight 427 crash) was the result of a sudden malfunction of the aircraft's rudder power control unit. Another incident (non-fatal) that contributed to the conclusion was that of Eastwind Airlines Flight 517, which had a similar problem upon approach to Richmond on June 9, 1996. On March 27, 2001, the NTSB issued a revised final report for Flight 585, which found that the pilots lost control of the airplane because of a mechanical malfunction. The renewed investigation concluded with a "probable cause" that stated: In popular culture The Discovery Channel Canada / National Geographic TV series Mayday dramatized the crash of Flight 585 and the subsequent 737 rudder investigation in a 2007 episode titled Hidden Danger. The crash is dramatized in the episode "Fatal Flaws" of Why Planes Crash. See also Boeing 737 rudder issues Eastwind Airlines Flight 517 USAir Flight 427 Alaska Airlines Flight 261 American Airlines Flight 1 Northwest Airlines Flight 85 References External links Memorial plaque at the crash site in Colorado Springs (Archive) Boeing 737 Rudder Design Defect Airliners.net Pre-crash photos Recording of the air traffic control transmissions between the aircraft and Colorado Springs Transportation in Colorado Springs, Colorado History of El Paso County, Colorado 1991 in Colorado Airliner accidents and incidents caused by design or manufacturing errors Airliner accidents and incidents caused by mechanical failure Aviation accidents and incidents in the United States in 1991 Airliner accidents and incidents in Colorado 585 Accidents and incidents involving the Boeing 737 Original March 1991 events in the United States Aviation accidents and incidents caused by loss of control