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777 Noise In The Middle Section

Wed Jul 03, 2013 10:01 am

Hello everyone,

Until Monday, I had not flown on a 777 in years, I've been mostly flying on 747s, A330s, A340s and of course the boring 737s and A320s.

When I did long ago, I also remember seating further back on the plane; Monday night I sat on row 21 of a United bird; as soon as I took my seat, I noticed the plane was really loud, I could hear what sounded like an engine or generator under my feet, kind of uncomfortable by the way.

Other topics mention electrical noise, until they start the engine, however, this sound lasted until after we were past 5,000 ft per the flight map, then, when we were approaching our destination, the "engine" came back on, was still on when I deplaned and I'm assuming it remained on until it departed back to the US.

Can anyone clarify if there's an engine/pump/generator on that area of the plane? I'm sure this is a stupid question, but, I've never heard a similar sound before on any other plane, including other 777s; the worst part is that I've always been a Boeing fan, and after this, I would definitely take an A330 before a 777 (comparing apples to oranges, I know, but still).

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RE: 777 Noise In The Middle Section

Wed Jul 03, 2013 10:12 am

Sitting over the wing and a bit behind you'll hear what I believe is a hydraulic booster pump. Typically it is on around flap retraction and during final approach so I assume it comes on to deal with the increased load at those times. Yes, it is rather loud.

[Edited 2013-07-03 03:13:20]
"There are no stupid questions, but there are a lot of inquisitive idiots." - John Ringo
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RE: 777 Noise In The Middle Section

Tue Jul 30, 2013 10:51 pm

There is some sort of a mechanism beneath the floor on most DC9/MD-nn aircraft that have a nice high-pitched howl. I am told that the pilots CAN turn them off after takeoff, but few do. It spoils almost every trip I take when I am stuck on one of those things. Folks can rave about how great the DC9/MDnn aircraft are, but with that pump noise going through me like a dentist drill I will take a 737 or an A319 ANY day.

Let the flaming begin.
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