LOT Polish Airlines Flight 7 increased engine wear, since the engines were under greater load. NK-8-4 engines were not reliable enough. Warranty service life was only 5000 hours, and about half of LOT engines failed after 2000–3000 hours. Because of this, Polish pilots often called the Il-62 "flying coffins". In spite of the low reliability, the airline decided to increase overhaul life intervals to reduce the frequency of repairs, which were carried out in Soviet factories and quite expensive. LOT sent a letter to the Ilyushin Design Bureau containing the results of a test in which it was found that the engines could operate normally
National Airline History Museum National Airline History Museum The National Airline History Museum is located at the Kansas City Downtown Airport in Kansas City, Missouri, United States. Founded in 1986 by aviation enthusiasts Larry A. Brown and Dick McMahon, the Airline History Museum was originally known as Save-A-Connie. Brown and McMahon were joined by a number of other enthusiasts, including (then) current and former TWA employees. The group began by highlighting commercial aviation in the propeller age but has since moved into the jet age with the acquisition of a Lockheed Tristar aircraft. They hope to further expand the museum's collection of vintage passenger