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
Root Letter Root Letter Root Letter, stylized as √Letter, is a 2016 visual novel adventure video game developed and published by Kadokawa Games for PlayStation 4, PlayStation Vita, Microsoft Windows, Android, and iOS. It is the first entry in the "Kadokawa Game Mystery" brand, and is to be followed by the upcoming "Root Letter 2". The game plays as an adventure visual novel. In the game, the player must figure out what happened to the character of Aya, a girl who mysteriously vanished after receiving a particular letter. The gameplay will be split into two distinct parts; the adventure part, where the