Singel09 From Netherlands, joined Jan 2005, 155 posts, RR: 0 Posted (10 years 1 month 6 days 7 hours ago) and read 8706 times:
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 ?
Kilavoud From , joined Dec 1969, posts, RR:
Reply 2, posted (10 years 1 month 6 days 3 hours ago) and read 8474 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.
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?
AlanUK From , joined Dec 1969, posts, RR:
Reply 5, posted (10 years 1 month 6 days 2 hours ago) and read 8416 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!
Jush From Germany, joined Apr 2005, 1638 posts, RR: 3
Reply 7, posted (10 years 1 month 6 days ago) and read 8165 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.
Starlionblue From Greenland, joined Feb 2004, 17365 posts, RR: 66
Reply 9, posted (10 years 1 month 6 days ago) and read 8144 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."
CanadianNorth From Canada, joined Aug 2002, 3406 posts, RR: 8
Reply 11, posted (10 years 1 month 5 days 22 hours ago) and read 7983 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.
UA777222 From United States of America, joined Dec 2003, 3348 posts, RR: 10
Reply 14, posted (10 years 1 month 5 days 19 hours ago) and read 6639 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.
Hm well... Shouldn't the engine sound be always present?
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.
Milan320 From Canada, joined Jan 2005, 873 posts, RR: 11
Reply 17, posted (10 years 1 month 5 days 17 hours ago) and read 5773 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.
Gasman From New Zealand, joined Mar 2004, 1347 posts, RR: 0
Reply 21, posted (10 years 1 month 5 days 8 hours ago) and read 3628 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.
MIAMIx707 From , joined Dec 1969, posts, RR:
Reply 22, posted (10 years 1 month 4 days 11 hours ago) and read 3018 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