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
Brand equity changes in strategic focus or direction that may necessitate adjustments in the way that its brands are being marketed. Consequently, effective brand management requires proactive strategies designed to at least maintain - if not actually enhance - brand equity in the face of these different forces. As a company's major enduring asset, a brand needs to be carefully managed so its value does not depreciate. Marketers can reinforce brand equity by consistently conveying the brand's meaning in terms of (1) what product it represents, what core benefits it supplies, and what needs it satisfies (2) how the brand makes product