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
Malaysian Airline System Flight 684 The plane slid along the ground for , skipped for , and finally struck a stream embankment where it slid another before coming to rest. The aircraft was still short of the runway and had lost its landing gear and both engines. All 247 passengers and crew survived, evacuating the aircraft before the fire destroyed it. The probable cause was ascribed to pilot error in not monitoring descent rate during approach in Instrument Meteorological Conditions (IMC) and continuing an approach below company minima without sighting the runway. Malaysian Airline System Flight 684 Malaysian Airline System Flight 684 was an international