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Very Disturbing Noises On A319 OS  
User currently offlineSingel09 From Netherlands, joined Jan 2005, 151 posts, RR: 0
Posted (9 years 3 months 4 days 10 hours ago) and read 8308 times:
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I flew on a pretty new A319 of Austrian Airlines last monday, row 11A, and was very much surprised, and not in a pleasant way, by the number of sources of noise in this aircraft ... the engine ... high noise, contstant present, the flaps and flaps deployment, very much noisy, and after landing, a constant high sound, loud .. very disturbing ... I would have guessed that a new plane, the OE-LDD, delivery march this year, would be a silent plane ,, anyway more silent that then 737-306 that I flew the next day of KLM, PH-BDC (1986) produced lower noise on engine, flaps etc deployment.

I was surprised. I would definately expect the A319 to be more quiet, but the opposite truth struck me.

Anyone same experience? Or are these sounds never to be expelled from the the interoir? One would guess that systems that generate 'counter-noise' systems like in the car industry, would be highly beneficial in the airline market.

Does someone have some insight on how the aircraft builders deal with this ?

Mause

22 replies: All unread, jump to last
 
User currently offlineMilan320 From Canada, joined Jan 2005, 869 posts, RR: 11
Reply 1, posted (9 years 3 months 4 days 6 hours ago) and read 8105 times:

Quoting Singel09 (Thread starter):
and after landing, a constant high sound, loud .. very disturbing ...

Probably the PTU, check out tech ops forum and do a search for PTU.
/Milan320



I accept bribes ... :-)
User currently offlineKilavoud From , joined Dec 1969, posts, RR:
Reply 2, posted (9 years 3 months 4 days 6 hours ago) and read 8076 times:

Sometimes our ears are catching or capturing noises much louder than they are in reality. The pressure up or down in the cabin may explain it.

Accustomed to fly on 777-200, I have notice that my perception of noises is changing during the flight. Then I hold my nose, blow energetically. And most of the time, I am surprised to see that my perception of noises have changed.

Try it next time.

Cheers. Kilavoud.


User currently offlinePhilhyde From United States of America, joined Aug 2003, 678 posts, RR: 1
Reply 3, posted (9 years 3 months 4 days 6 hours ago) and read 8054 times:

Quoting Singel09 (Thread starter):
Anyone same experience?

These sound like normal noises I hear on NW A319's all the time. In particular, the engine noise is probably a direct result of where you are seated. Did it change when/if you got up and walked around?

cheers,
Phil



HoustonSpotters Admin - Canon junkie - Aviation Nut
User currently offlineAS739X From United States of America, joined Apr 2003, 6161 posts, RR: 24
Reply 4, posted (9 years 3 months 4 days 6 hours ago) and read 8049 times:

Welcome to the world of A32X series A/C, this is just thier noise! All normal...

ASSFO



"Some pilots avoid storm cells and some play connect the dots!"
User currently offlineAlanUK From , joined Dec 1969, posts, RR:
Reply 5, posted (9 years 3 months 4 days 5 hours ago) and read 8018 times:

I know exactly the noise you're talking about. Especially the high-pitch noise after landing. It's common on the A319, but I don't find it that loud to be fair and find the aircraft much quieter than any of the 737s, especially down the back!

User currently offline1MillionFlyer From , joined Dec 1969, posts, RR:
Reply 6, posted (9 years 3 months 4 days 3 hours ago) and read 7831 times:

The A319 is one of the most quiet aircraft at cruise however.

I love that plane!


User currently offlineJush From Germany, joined Apr 2005, 1636 posts, RR: 3
Reply 7, posted (9 years 3 months 4 days 3 hours ago) and read 7767 times:

Quoting Kilavoud (Reply 2):
Accustomed to fly on 777-200, I have notice that my perception of noises is changing during the flight. Then I hold my nose, blow energetically. And most of the time, I am surprised to see that my perception of noises have changed.

Absolutely i denfenitely concur. Thame experience with my ears on an A340-600 from Lufthansa... especially when we were descending my perception of sounds was changing alot through the descend



There is one problem with airbus. Though their products are engineering marvels they lack passion, completely.
User currently offlineLiedetectors From United States of America, joined Jul 2005, 360 posts, RR: 0
Reply 8, posted (9 years 3 months 4 days 3 hours ago) and read 7759 times:

Quoting Milan320 (Reply 1):
Probably the PTU, check out tech ops forum and do a search for PTU.

Hi. what is a PTU?



If it was said by us, then it must be true.
User currently offlineStarlionblue From Greenland, joined Feb 2004, 17068 posts, RR: 66
Reply 9, posted (9 years 3 months 4 days 3 hours ago) and read 7746 times:

It's the Power Transfer Unit (I think that's the name). If I recall Correctly, when one of the hydraulic systems is off a pump transfers pressure from one to the other. Since this happens at startup and shutdown...

Or as I always say, "It's them darned racoons".



"There are no stupid questions, but there are a lot of inquisitive idiots."
User currently offlineStar_world From Ireland, joined Jun 2001, 1234 posts, RR: 0
Reply 10, posted (9 years 3 months 4 days 1 hour ago) and read 7627 times:

Quoting Liedetectors (Reply 8):

Probably the PTU, check out tech ops forum and do a search for PTU.

Hi. what is a PTU?

lol  Smile The question you quoted in your own response would answer exactly that question for you...!


User currently offlineCanadianNorth From Canada, joined Aug 2002, 3390 posts, RR: 9
Reply 11, posted (9 years 3 months 4 days 1 hour ago) and read 7585 times:

I find flying on 319s I've noticed 2 sounds I've never heard on any other aircraft (other than A320), at takeoff power the engines dont really roar like most jets do, just get louder and make that funky whining noise. Also, when doing a sharp turn here for about 2-3 seconds during the sharp turn there was a loud rumbling noise coming from the front, and the aircraft shook pretty good and then the turn was over and we came to a stop and the noise/shaking stopped. Definetly woke me up (and everyone around me was also looking around the cabin and out the windows with a concerned look, and I could see 1 F/A sitting in her seat and even she kinda looked around with a somewhat confused/concerned look. At first I thought we broke something on the nose gear, but after several seconds of sitting there the engines roared up and off we went for another normal uneventful flight and a normal landing in YVR.



CanadianNorth



What could possibly go wrong?
User currently offlineSimProgrammer From France, joined Aug 2004, 193 posts, RR: 0
Reply 12, posted (9 years 3 months 4 days 1 hour ago) and read 7478 times:

The PTU is only heard by the pax seated overwing when you do your pre-taxi checklist and again during final approach checklist.

The other noises? well, a pax might as well break-wind and you will hear it.



Drive a bus, an Airbus, easier than a London bus!
User currently offlineTheredbaron From Mexico, joined Mar 2005, 2259 posts, RR: 9
Reply 13, posted (9 years 3 months 3 days 23 hours ago) and read 6551 times:

Even the noisies plane is no match for 2 good rock and roll ear plugs (110db kind -35 to 40 attenuation) and noise canceling earphones over that....

the Beethoven recipe..!!  Smile



The best seat in a Plane is the Jumpseat.
User currently offlineUA777222 From United States of America, joined Dec 2003, 3348 posts, RR: 11
Reply 14, posted (9 years 3 months 3 days 22 hours ago) and read 6241 times:

Funny you should start this topic as I now will never fly on a U2 A319 again! Nothing to do with A nor does it have to do with B. All I know is that I was indeed seated over the wing and that even before we reached the hold short line I was having a major head ache. Thank god the flight was only NCE-ORY.

Take care,

Matt



"It wasn't raining when Noah built the ark."
User currently offlineA3xx900 From Germany, joined Jan 2004, 335 posts, RR: 0
Reply 15, posted (9 years 3 months 3 days 22 hours ago) and read 6201 times:

Quoting Singel09 (Thread starter):
the engine ... high noise, contstant present

Hm well... Shouldn't the engine sound be always present?  Wink

I was on an A319/A321 the other day and I must say I loved it. I was seated behind the wings on both flights and it was just as loud as you'd expect it in an aircraft.
Nothing compared to a 772, which is, IMO, very loud directly behind the wing.



Why is 10 afraid of 7? Because 7 8 9.
User currently offlineJamieD From UK - England, joined Apr 2002, 613 posts, RR: 9
Reply 16, posted (9 years 3 months 3 days 21 hours ago) and read 5895 times:

Quoting Kilavoud (Reply 2):
I hold my nose, blow energetically

Don't! That is really bad for your ears.  Smile


User currently offlineMilan320 From Canada, joined Jan 2005, 869 posts, RR: 11
Reply 17, posted (9 years 3 months 3 days 20 hours ago) and read 5375 times:

Quoting Starlionblue (Reply 9):
It's the Power Transfer Unit (I think that's the name). If I recall Correctly, when one of the hydraulic systems is off a pump transfers pressure from one to the other. Since this happens at startup and shutdown...

Thanks Starlionblue ... you're right the PTU is the Power Transfer Unit, and if I remember correctly, the left-engine powers the green and blue hydraulic units, whilst the right powers the yellow. The normal way to start the engines is the left engine and then the right. If the pressure differential between the yellow and the other hydraulic systems is greater than I think 2500 PSI (or 5000 PSI) then the PTU kicks in to power up the yellow system until the right engine is started. Sometimes, pilots taxi on one engine and you'll hear it until both engines are up and running.

I can't remember all of the specifics, so don't quote me on any of it, and I'm sure someone can correct me. At the same time, someone in tech ops can explain it correctly. There are threads on this particular subject there, so one just needs to do a search.

Cheers!
/Milan320



I accept bribes ... :-)
User currently offlineA340600 From United Kingdom, joined Aug 2003, 4105 posts, RR: 51
Reply 18, posted (9 years 3 months 3 days 20 hours ago) and read 5317 times:

Ahh, the funny noises of the Airbus, gotta love it!

Despite all these the A32X series is much quieter than the 737 on all the flights i've been on!

Sam



Despite the name I am a Boeing man through and through!
User currently offlineStarlionblue From Greenland, joined Feb 2004, 17068 posts, RR: 66
Reply 19, posted (9 years 3 months 3 days 20 hours ago) and read 5247 times:

Quoting Theredbaron (Reply 13):
Even the noisies plane is no match for 2 good rock and roll ear plugs (110db kind -35 to 40 attenuation) and noise canceling earphones over that....

Exactly. If you don't like the noise, go here http://www.bose.com/controller?event...&product=qc2_headphones_index&ck=0 or here http://www.protravelgear.com/store/E..._Headphones___Solitude___159?Args=

If you fly more than zero times this year, you won't regret it.



"There are no stupid questions, but there are a lot of inquisitive idiots."
User currently offlinePER744 From Australia, joined Mar 2003, 405 posts, RR: 2
Reply 20, posted (9 years 3 months 3 days 14 hours ago) and read 3967 times:

Quoting JamieD (Reply 16):
Don't! That is really bad for your ears.

Actually, according to my Ear, Nose & Throat specialist it's apparently quite good for your ears and should be done regularly.


User currently offlineGasman From New Zealand, joined Mar 2004, 862 posts, RR: 0
Reply 21, posted (9 years 3 months 3 days 11 hours ago) and read 3230 times:

Quoting PER744 (Reply 20):
Actually, according to my Ear, Nose & Throat specialist it's apparently quite good for your ears and should be done regularly

What we are talking about here is the "valsalva manoeuvre" which equals a forced expiration against a closed glottis. It has the effect of opening the eustatian tubes (a state which they're supposed to be in anyway) and equalising the pressure between the middle ear (where you feel the pressure) and the "atmosphere" (in this case the cabin of the aircraft. It's neither particulary good nor bad for you - although you could make a rather weak argument that eustatian tubes that are closed for long periods might predispose to middle ear infection.


User currently offlineMIAMIx707 From , joined Dec 1969, posts, RR:
Reply 22, posted (9 years 3 months 2 days 14 hours ago) and read 2620 times:

Quoting A340600 (Reply 18):
Despite all these the A32X series is much quieter than the 737 on all the flights i've been on!

I've flown in both a UA 737-300 and UA A320, landed on the same runway, same flight. The 737 was just like any other plane but on landing the inside of the A320 rattled like it was falling apart (it might have been when the thrust reversers came on but i can't remember) If that flight was anyone's first plane ride, I'm sure they wen't straight to the bathroom to go pee pee after they got off ..lol


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