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
Adam Air Flight 172 . Among those to be replaced were the directors of air and sea transports and the chairman of the National Committee for Transportation Safety. Indonesia also intended to introduce a new system of ranking airlines according to their safety record, with a level one ranking meaning the airline has no serious issues, a level two ranking meaning the airline must fix problems, and a level three rating forcing the airline to be shut down. Adam Air Flight 172 Adam Air Flight 172 refers to an accident suffered by a Boeing 737-300, when it landed in Surabaya at the end of