Boeing 787's Quiet Technology is put to the Test.
A Boeing 787 performs a low fly-over in Glasgow, Montana, during a test of the airplane's community noise level. Engineers spent years trying to reduce the noise profile of the 787, which is designed to be much quieter than today's similarly-sized airplanes. Several years ago, in an office building near the 787 Dreamliner factory, a small group of Boeing engineers were quietly working on a lofty goal. "We were trying to make the 787 airplane come out the quietest airplane of its size and capability," recalls noise engineer Mark Sandstrom. Sandstrom and his colleagues set out to look for ways to make the jetliner quieter from tip to tail, participating in every facet of the Dreamliner's design. In the video above, you can hear the results as two 787 test airplanes were brought to Glasgow, Montana for tests of its community noise levels. First, flight test engineers embedded ultra-sensitive microphones along the runway of a secluded airfield. Then, Boeing test pilots performed multiple takeoffs and approaches, testing each engine thrust setting to see how much noise the airplane generated. The 787's noise footprint will be as much as 60% smaller than today's comparable airplanes. "For the approaches, you'll come in, you'll pitch the airplane over," says Boeing test pilot Captain Craig Bomben. "You have to pitch over at a certain location and then the pilot's responsibility is to hold air speed as constantly as possible. Any deviations in air speed up to say 5 knots, 4 to 5 <b>...</b>
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