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Myth: V-22 exhaust damages the flight decks of Navy ships
Fact: When the MV-22B nacelles are positioned vertically for takeoff, the engine exhaust gases are directed toward the flight deck. As a precautionary measure, flight deck portable heat shields were utilized aboard LSD and LPD class ships during the first MV-22B shipboard deployment. Subsequent testing and analysis determined that instead of these heat shields, a nacelle modulation technique was a more suitable and effective method to protect the flight deck. This nacelle modulation, wherein the nacelles are periodically rotated a small number of degrees, prevents heat build up in the deck plating and thus negates any chance of damage.”
http://www.boeing.com/ospreynews/201..._guidebook.pdf (3.7Mb)