What is the whining sound on the 787?

The noise is caused by a hydraulic pump which is situated directly below the cabin. It mostly runs on takeoff and landing, but it can also run automatically at other times. Dogs have been reported to need psychiatric treatment after being transported on a 787.



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The high pitched whine tends to come from planes where the high-speed jet exhaust is relatively uninsulated from the ambient air. The 727 was a classic example of this kind of extremely noisy jet. The same tends to be true of military jets and small business jets.

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A High-Pitched 'Woof-Woof-Woof' It's making sure the hydraulic pressure is balanced when they only use one engine during push-back and taxiing. Everyone wants to save fuel, so this is their option. It's noisy and a bit unnerving as it cycles on and off, on and off, on and off due to pressure fluctuations.

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The noise level has decreased to around 90 decibels in Airbus A350, Boeing 787, Airbus A320neo and Boeing 737 MAX aircraft, which are the most modern passenger aircraft today.

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Answer: You are probably hearing the electric motor that moves the cargo door. The door is raised and lowered by an electric motor on many airplanes. Q: Why do Airbus planes make so much hydraulic noise before takeoff and after landing compared to Boeings?

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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 787 is on average up to 7 dB quieter on departure than the 767, and up to 8 dB quieter than the A330 aircraft. The results also confirm that the 787 is up to 3 dB quieter on arrival than the aircraft types it is intended to replace.

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Another noise peculiar to Airbus models is a shrill, prolonged whine heard at the gate prior to departure and again after landing. This is an electric hydraulic pump used to open and close the cargo doors.

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Meanwhile, one single tone means that a passenger is trying to get help from a flight attendant. This is the sound you'll hear if you press the “call” button at your seat. Three tones mean an emergency, Cimato says.

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“There's a plethora of evidence that you go into a relative state of hypoxia [oxygen deficiency] when you're in flight,” said Quigley. The affects, she says, may not be realized by passengers. “One person might feel weepy, another sleepy – hypoxia affects people in different ways.

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Departures tend to be louder than arrivals since the pilot is using more power to the engine to achieve lift.

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The back of the plane is definitely the worst place to sit for travelers who hate turbulence since it's far from the plane's center of lift and gravity. This section can also be very loud since some planes have engines and auxiliary power units toward the back of the body that make a lot of noise.

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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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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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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 Boeing 787 Dreamliner has revolutionized flying for both passengers and pilots. Taking a leap into the future from its predecessors, the designers incorporated a number of new features that make the Dreamliner one of the most fuel efficient and comfortable aircraft in the skies.

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Former pilot Bubb told Newsweek that two dings mean the plane is climbing through 10,000 feet and/or the pilots are asking flight attendants to prepare the cabin for landing. A whoosh sound means the landing gear is extending in preparation for landing, Bubb added.

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All airplanes will be exposed to drag during flight. They must overcome this aerodynamic force to achieve and maintain lift. Otherwise, airplanes would essentially fall out of the sky. Air brakes are control surfaces that increase drag so that airplanes slow down during flight.

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Those 'Ding' Sounds You Hear In Flight Are A 'Secret' Code You're listening in on the cabin crew communicating. It is actually, the old 'no-smoking' sign dinging. You are hearing just after take off.

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