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Is This Noise Normal On A330s @ Take Off?  
User currently online747400sp From United States of America, joined Aug 2003, 3719 posts, RR: 2
Posted (2 years 11 months 2 weeks 6 days 6 hours ago) and read 5036 times:

I was watching this video of an US A330 taking off, and I wonder if this loud noise is normal on A330s when they take off?



Here is the link


http://www.youtube.com/watch?v=-GOWerl4pMU

17 replies: All unread, jump to last
 
User currently offlineChamonix From France, joined Mar 2011, 414 posts, RR: 2
Reply 1, posted (2 years 11 months 2 weeks 6 days 6 hours ago) and read 5030 times:
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You can hear it even louder and clearer here:
http://vimeo.com/8814427


User currently offlineYchocky From Canada, joined Jul 2009, 173 posts, RR: 0
Reply 2, posted (2 years 11 months 2 weeks 6 days 5 hours ago) and read 5002 times:

Interesting.

OT: anyone notice the Tu-154 parked to the west of the BA Cargo buildings? Looks like a Slovakian Gov.


User currently offlinemickey90 From Sweden, joined Nov 2011, 65 posts, RR: 0
Reply 3, posted (2 years 11 months 2 weeks 6 days 5 hours ago) and read 5001 times:

I've heard this sound many times before and not just on the a330.

I'm not 100% sure, but I believe you hear this sound when the pilots are using full thrust.



It's better to be in the air wishing you were on the ground than being on the ground wishing you were in the air
User currently offlineStarlionblue From Greenland, joined Feb 2004, 17108 posts, RR: 66
Reply 4, posted (2 years 11 months 2 weeks 6 days 1 hour ago) and read 4876 times:

You mean the buzzsaw right? Completely normal. It's the sound of the fan blade tips going supersonic.

As mickey90 says it happens on lots of aircraft. It is just more pronounced on some, the DC-10 for example.



"There are no stupid questions, but there are a lot of inquisitive idiots."
User currently offlineshufflemoomin From Denmark, joined Jun 2010, 480 posts, RR: 2
Reply 5, posted (2 years 11 months 2 weeks 6 days 1 hour ago) and read 4860 times:

Quoting Chamonix (Reply 1):

You can hear it even louder and clearer here:
http://vimeo.com/8814427

Really good video. (I had a chuckle to myself that they have a disclaimer saying they'll take legal action for any illegal use when they have music in the beginning that is a clear rip off of Mofo by U2  


User currently offlineXFSUgimpLB41X From United States of America, joined Aug 2000, 4223 posts, RR: 37
Reply 6, posted (2 years 11 months 2 weeks 5 days 22 hours ago) and read 4810 times:

That howling noise at rotation that is intermittent in the USair video is most certainly not the buzz saw from the fan blades.

Interesting noise... Perhaps something to do with the hydraulics?

Edit- I watched the Swiss video. The howling noise was not audible from that one.

[Edited 2011-12-08 19:25:23]


Chicks dig winglets.
User currently offlinetdscanuck From Canada, joined Jan 2006, 12709 posts, RR: 80
Reply 7, posted (2 years 11 months 2 weeks 5 days 20 hours ago) and read 4770 times:

Quoting XFSUgimpLB41X (Reply 6):
That howling noise at rotation that is intermittent in the USair video is most certainly not the buzz saw from the fan blades.

Agreed. Although buzzsaw is audible on this video, it's not the intermittent noise that starts at rotation.

Quoting XFSUgimpLB41X (Reply 6):
Interesting noise... Perhaps something to do with the hydraulics?

It sounds very much like an electric hydraulic pump. Based an a review of the A330 hydraulics documentation, it could be the yellow system electric pump coming online as the airplane goes from ground to air mode. However, it keeps going a lot longer than I'd expect based on what appears to be the yellow system automatic pump logic.

It could also be a cavity resonance but it's so loud and prominent that I'm surprised they wouldn't have fixed it.

Tom.


User currently offlineplanejamie From United Kingdom, joined Sep 2011, 576 posts, RR: 1
Reply 8, posted (2 years 11 months 2 weeks 5 days 7 hours ago) and read 4607 times:

I also notice a mistake, that's definitely a A330-200, the spool up sounds just like a RR Trent 700. However, that noise isn't from the engines, I can hear the buzz-saw engine sound before the noise starts, I reckon the hydraulics, but I'm no expert on that.

User currently offlineAA737-823 From United States of America, joined Mar 2000, 5913 posts, RR: 11
Reply 9, posted (2 years 11 months 2 weeks 3 days ago) and read 4249 times:

NO, that noise is NOT normal.
I'm not sure what it is... I'm not convinced that it's an electric hydraulic pump. None of my electric hydraulic pumps sound that wretched...

I find the video's original comments to be quite annoying... apparently, no one bothered to tell this kid that turbulence has little to do with airplanes and more to do with, oh, WIND... and that you can also install in seat power in 777s, not to mention nine in PTV's....
I would not call any particular line number that makes this noise a "win" as he does. I do like the A330, but this one, as an airline mech, would make me a little nervous. But then, as an airline mech, I'm typically a nervous flyer anyhow.

It actually COULD be a leaky window seal, which would explain why it began during takeoff roll (pressurize to 50 feet below field level) and ended as Delta-P increased... Just a theory though.


User currently offlineAA737-823 From United States of America, joined Mar 2000, 5913 posts, RR: 11
Reply 10, posted (2 years 11 months 2 weeks 3 days ago) and read 4248 times:

In addition, the video poster is actually completely wrong- he's jumping up and down about how he's on a 333, in spite of people telling him that it's a 332 with Rolls power... But I've now got proof! The ECU cooling air inlet is plainly visible in front of the engine strut, which is where it's located on a ROLLS engine. The Pratt that US uses to power their 333's doesn't have one.
So, he's on a 332 with a Roller. Someone should educate him, and also give him an internet tongue-lashign for being such a pratt himself.


User currently offlineStarlionblue From Greenland, joined Feb 2004, 17108 posts, RR: 66
Reply 11, posted (2 years 11 months 2 weeks 3 days ago) and read 4241 times:

Quoting AA737-823 (Reply 10):
In addition, the video poster is actually completely wrong- he's jumping up and down about how he's on a 333, in spite of people telling him that it's a 332 with Rolls power... But I've now got proof! The ECU cooling air inlet is plainly visible in front of the engine strut, which is where it's located on a ROLLS engine. The Pratt that US uses to power their 333's doesn't have one.
So, he's on a 332 with a Roller. Someone should educate him, and also give him an internet tongue-lashign for being such a pratt himself.

Nothing good can come of getting involved in YouTube comments.   



"There are no stupid questions, but there are a lot of inquisitive idiots."
User currently offlineSpeedbird741 From Portugal, joined Aug 2008, 654 posts, RR: 0
Reply 12, posted (2 years 11 months 2 weeks 1 day 13 hours ago) and read 3985 times:

Quoting AA737-823 (Reply 9):
NO, that noise is NOT normal.

As a regular flier on the A343, I actually hear this exact sound quite often as well. Curiously enough, I've heard it during takeoff and landing (it becomes very pronounced during flare). I have always been inclined to believe that it is the yellow electric pump, but since I heard the sound increase so much during flare I thought it might have something to do with air flowing irregularly through the slats. Just basic speculation on my behalf of course, but I would like to hear your thoughts on that. I also have a video of the occurence should you be curious enough to watch it. Here is a youtube video of the same sound on a Cathay A343 starting at 6:18.

http://www.youtube.com/watch?v=Uj3Yb...648F2F6&index=5&feature=plpp_video

Speedbird741



Boa noite Faro, Air Portugal 257 climbing flight level 340
User currently offlineEMBQA From United States of America, joined Oct 2003, 9364 posts, RR: 11
Reply 13, posted (2 years 11 months 2 weeks 21 hours ago) and read 3852 times:

This kind of question gets asked all the time on A.net about different aircraft and ...'what sound is this.. is it normal'.....So much of it is dependent on many-many different veriables. Quality of the microphone, quality of the source, location recorded in the aircraft, weather conditions, type of engine even down to the airlines choice in insulation. If you were seated in seat 15A it would sound different to someone seated in 18C. The sound envelope changes as you sit in different places around the cabin.

[Edited 2011-12-13 19:32:09]


"It's not the size of the dog in the fight, but the size of the fight in the dog"
User currently offlineAirbus_A340 From Hong Kong, joined Mar 2000, 1560 posts, RR: 19
Reply 14, posted (2 years 11 months 2 weeks 13 hours ago) and read 3797 times:

Quoting XFSUgimpLB41X (Reply 6):
Interesting noise... Perhaps something to do with the hydraulics?
Quoting tdscanuck (Reply 7):
It sounds very much like an electric hydraulic pump. Based an a review of the A330 hydraulics documentation, it could be the yellow system electric pump coming online as the airplane goes from ground to air mode.

Just to clarify, none of the electric hydraulic pumps are operating during this phase of flight under normal circumstances for A330/A340.



People. They make an airline. www.cathaypacific.com
User currently offlinemafi29 From Germany, joined Nov 2010, 58 posts, RR: 0
Reply 15, posted (2 years 11 months 2 weeks 11 hours ago) and read 3774 times:

Quoting AA737-823 (Reply 9):
pressurize to 50 feet below field level


Just out of curiosity: Why is the cabin pressurized to 50 ft below field level at take off?

I know it is off topic, so please forgive me.

[Edited 2011-12-14 05:22:18]

User currently offlinetdscanuck From Canada, joined Jan 2006, 12709 posts, RR: 80
Reply 16, posted (2 years 11 months 2 weeks 10 hours ago) and read 3753 times:

Quoting Airbus_A340 (Reply 14):
Just to clarify, none of the electric hydraulic pumps are operating during this phase of flight under normal circumstances for A330/A340.

I misread this manual: http://www.smartcockpit.com/pdf/plane/airbus/A330/systems/0012/

The auto yellow pump would only come on if engine 2 failed, correct?

Tom.


User currently offlineje89_w From United States of America, joined Mar 2002, 2362 posts, RR: 9
Reply 17, posted (2 years 11 months 2 weeks 9 hours ago) and read 3734 times:
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PHOTO SCREENER

Interesting sound, something I've never heard before either. And yes those are Rolls Royce Trent 700s, so without a doubt it's a US Airways A332 in spite of what the Youtube user said.

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