How many decibels is the Dreamliner?

The 787 Dreamliner uses a number of new technologies—most importantly, acoustically treated engine inlets and high bypass ratio along with other special treatments for the engines—to ensure that all sound of 85 decibels (about the level of loud traffic heard from the side of the road) never leaves the airport ...



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Is A380 quieter than 787? The website tinitustalk.com pulled research figures together for several widebody aircraft – with the A380 coming in lowest at 69.5 dB. The Boeing 787, for comparison, was quoted as 72.7 dB and the Airbus A350 at 74.9 dB.

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The sound comes from the rotary hydraulic motor situated in the wheel well of the jet which turns the drive shaft for the flap drive screw jacks.

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The Dreamliner's lightweight composite structure contributes to reduced noise levels, both inside and outside the aircraft. The use of advanced soundproofing materials and quieter engines keeps the cabin environment more tranquil for passengers.

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However, did the 787 truly fly supersonic relative to the air? The answer is no. The 787 is a widebody passenger aircraft capable of flying long distances at a cruise speed of 0.85 Mach (652 mph/1,050 kph).

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The typical lifespan of airliners The composite-driven Boeing 787 Dreamliner is designed for 44,000 flight cycles. These jets can theoretically last several decades with an average of two flight cycles a day. Unlike commercial airliners, fighter jets are unique due to their mission requirements.

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For a rough estimate, most jet airliners takeoff and land at , roughly, 140–150 mph. Of course we deal with knots, but for a “civilian”, 150 mph. Has the 787 Dreamliner been a success for Boeing and its customers?

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It has been reported that the A350 is quieter than the B787, primarily due to the automatic Noise Abatement Departure Procedure (NADP) for the optimization of the engine thrust and flight path to reduce noise and the fuel-efficient engine. The other giant airplane, A380, is also known to have a quiet cabin.

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The loudest aircraft still in commercial service in any significant numbers is the Boeing 727. The 727 is banned from most major airports due to its noise levels. Among aircraft permitted worldwide, the Boeing 747–400 is noticeably louder than other widebody aircraft such as 777, A380 and A350.

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• Because the 787 is pressurized at about 6,000 feet rather than 8,000 feet, you'll breathe easier. More oxygen in your lungs means better sleep, less chance of headache, no difficulty breathing (flying at altitude is like sleeping at a ski resort).

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The 787's latest problem mirrors production issues discovered over 2020 and 2021 that included improperly fitted shimming that led to paper-thin gaps between surfaces on the Dreamliner's fuselage.

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For most commercial airplanes, the seats closest to the front of the plane are the quietest. And although it's not always possible to get a front row seat, anything in front of the wing is preferable to seating behind the wing. The loudest row is just behind the wing where the engines are located.

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The carbon-fibre structure of the 787 allows the aircraft to be pressurized to a much higher level than on many other aircraft types. The lower the cabin altitude, the better you feel both during and after the flight, allowing your body to adjust to your new time zone more quickly.

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2 Boeing 787 Dreamliner The Dreamliner's lightweight composite structure contributes to reduced noise levels, both inside and outside the aircraft. The use of advanced soundproofing materials and quieter engines keeps the cabin environment more tranquil for passengers.

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The Air Inside The cabin pressure on the 787 is higher and the humidity higher than other airplanes. Basically, passengers on board will feel like they are at an altitude of 6,000 feet, 2,000 feet lower than a standard flight.

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The longer the 787s remained on the ground, the more it would cost to get them to fly again, due to the maintenance work required. As a result, they were no longer airworthy.

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This advanced fly-by-wire system also is the key to Smoother Ride Technology – unique to the 787 family -- which senses turbulence and adjusts control surfaces automatically to dampen its effects before it reaches the passengers.

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