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Vibration And Sound On 777  
User currently offlineJcavinato From United States of America, joined Jan 2005, 520 posts, RR: 0
Posted (7 years 2 weeks 6 days ago) and read 2124 times:

I've been in row 13 (last row window) on American's 777 several times. I like that corner of the business class cabin, because on night flights it seems the quietest and easiest for sleep. What I notice, though, is a periodic low sound accompanied by a very slight vibration from somewhere in the aircraft. It appears to go on and off about every thirty seconds. It is not toilets being flushed. This row is over the wing on these planes.

What might that be? Would it be fuel pumps?

4 replies: All unread, jump to last
 
User currently offlineHAWK21M From India, joined Jan 2001, 31684 posts, RR: 56
Reply 1, posted (7 years 2 weeks 5 days 13 hours ago) and read 2062 times:

Maybe Flight controls flutter.probably on Empennage area.
regds
MEL



Think of the brighter side!
User currently offlineStarlionblue From Greenland, joined Feb 2004, 17039 posts, RR: 66
Reply 2, posted (7 years 2 weeks 5 days 9 hours ago) and read 2035 times:

Quoting Jcavinato (Thread starter):
Would it be fuel pumps?

Probably not.

As HAWK21M says, it may be flight controls. The 777 has notoriously loud hydraulics if you sit in the wing area. You may have noticed that during landing there is also a loud sustained grinding.



"There are no stupid questions, but there are a lot of inquisitive idiots."
User currently offlineJcavinato From United States of America, joined Jan 2005, 520 posts, RR: 0
Reply 3, posted (7 years 2 weeks 5 days 8 hours ago) and read 2025 times:

Yes, grinding is what it sounds like.

Thank you. I knew it was no doubt nothing to worry about. It's just very noticable when having an ear against the seat head cushion.


User currently offlineStarlionblue From Greenland, joined Feb 2004, 17039 posts, RR: 66
Reply 4, posted (7 years 2 weeks 5 days 6 hours ago) and read 2001 times:

Quoting Jcavinato (Reply 3):

Thank you. I knew it was no doubt nothing to worry about. It's just very noticable when having an ear against the seat head cushion.

Been there, done that. May I recommend: http://www.amazon.com/Etymotic-Resea...=electronics&qid=1188577020&sr=8-2



"There are no stupid questions, but there are a lot of inquisitive idiots."
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