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A320: Dental Drill Sounds?  
User currently offlineKELPkid From United States of America, joined Nov 2005, 6343 posts, RR: 3
Posted (8 years 5 days 16 hours ago) and read 5185 times:

My wife and I were on a UA A320 flight at DEN yesterday, and on taxi-out (a couple of miles at DEN  Wink ), the aircraft was making sounds very similar to the pneumatic drill at the dentist's office (sorry, this is the best description I can come up with). Just curious what the sound might be. They were taxiing on one engine, so I'm wondering if this is related to special hardware to cope with one hydraulic system being out, etc. The sounds went away as soon as the second engine was started.

Thanks,

Brent


Celebrating the birth of KELPkidJR on August 5, 2009 :-)
32 replies: All unread, showing first 25:
 
User currently offlineSlamClick From United States of America, joined Nov 2003, 10062 posts, RR: 68
Reply 1, posted (8 years 5 days 16 hours ago) and read 5176 times:

Not again!

Forum search: "Airbus" "noises" "sounds""barking dogs"

The explanation of those noises should be part of the Tech/Ops page header.



Happiness is not seeing another trite Ste. Maarten photo all week long.
User currently offlineN8076U From United States of America, joined Jun 2006, 425 posts, RR: 9
Reply 2, posted (8 years 5 days 15 hours ago) and read 5155 times:

Quoting SlamClick (Reply 1):
Not again!

This does seem to come up fairly often.  Wink

What you heard is the PTU, power transfer unit, which is part of the hydraulic system.

Chris



Don't blame me, I don't work here...
User currently offlineSlamClick From United States of America, joined Nov 2003, 10062 posts, RR: 68
Reply 3, posted (8 years 5 days 15 hours ago) and read 5155 times:

Here's one:
RE: A320/A319 "barking" After Shutdown (by SlamClick Apr 12 2005 in Tech Ops)#ID115403

It is the hydraulic PTU.



Happiness is not seeing another trite Ste. Maarten photo all week long.
User currently offlineSlamClick From United States of America, joined Nov 2003, 10062 posts, RR: 68
Reply 4, posted (8 years 5 days 10 hours ago) and read 5040 times:

Attn: Threadstarter.

Acknowledging that you got the information you wanted keeps you on the list of people who get their questions answered.


Failing to do so does not, on the other hand, give you immunity from smartass remarks like

Quoting SlamClick (Reply 1):
Not again!

Forum search:

and

Quoting N8076U (Reply 2):
This does seem to come up fairly often.

or

Quoting NKP S2 (Reply 4):
Surely a use of a search function is within your purview then.



Happiness is not seeing another trite Ste. Maarten photo all week long.
User currently offlineKELPkid From United States of America, joined Nov 2005, 6343 posts, RR: 3
Reply 5, posted (8 years 5 days 9 hours ago) and read 5028 times:

Quoting SlamClick (Reply 5):
Acknowledging that you got the information you wanted keeps you on the list of people who get their questions answered.


Message received.

Yes, I got the info that I was after, thanks  Smile

Quoting SlamClick (Reply 5):
or

Quoting NKP S2 (Reply 4):
Surely a use of a search function is within your purview then.


I did suggest this smartypants response for deletion...and funny, a thread search on A320 and "dental drill" yielded no answers. Don't even try A320 and "noise", you'll be wading through the hits for hours!  Wink



Celebrating the birth of KELPkidJR on August 5, 2009 :-)
User currently offlineHangarRat From United States of America, joined Jul 2005, 633 posts, RR: 0
Reply 6, posted (8 years 5 days 8 hours ago) and read 5005 times:

Interestingly, I'd flown on A320 series planes a dozen or so times before I noticed the noise. Thankfully I'd read at least four dozen threads about the barking noises by that point, so when I heard them I was able to tell my fellow pax exactly what it was.

I agree, it sounds like a robotic St. Bernard in the cargo hold.



Spell check is a false dog
User currently offlineHAWK21M From India, joined Jan 2001, 31667 posts, RR: 56
Reply 7, posted (8 years 5 days 2 hours ago) and read 4948 times:

Power Transfer Unit.
Do a Search...You'll be surprised on the Number of Threads.  Smile
regds
MEL



Think of the brighter side!
User currently offlineSlamClick From United States of America, joined Nov 2003, 10062 posts, RR: 68
Reply 8, posted (8 years 4 days 20 hours ago) and read 4888 times:

Quoting KELPkid (Reply 5):
thread search

Well, to all the people who are spring-loaded to the 'do a search' response, let me suggest that you try the search.

It took me nearly an hour to come up with the thread I linked to in post #3. All us long-time readers here know that question comes up about once every six months or so, and that a couple of the early threads on it have maybe a hundred replies. So I tried a search with...

"Airbus" and "sound"
"Airbus" and "noise"
"Airbus" and "drilling"
"Airbus" and "barking"
"A-320" and "sound"
"A-320" and "noise"
"A-320" and "drilling"
"A-320" and "barking"

...and got nothing. Eventually I dredged it up by going through all my posts in old Tech/Ops threads. So maybe the search function ain't all that wonderful and maybe its okay if this one pops up from time to time.

I still think it should be part of the page header.



Happiness is not seeing another trite Ste. Maarten photo all week long.
User currently offlineDavid L From United Kingdom, joined May 1999, 9523 posts, RR: 42
Reply 9, posted (8 years 4 days 19 hours ago) and read 4866 times:

Quoting HangarRat (Reply 6):
Interestingly, I'd flown on A320 series planes a dozen or so times before I noticed the noise.

Same here, I'm embarrassed to say. I don't know how I could have missed it! I think I just assumed it was the stabiliser being trimmed, or something similar, and tuned it out.


User currently offlineStarlionblue From Greenland, joined Feb 2004, 16991 posts, RR: 67
Reply 10, posted (8 years 4 days 15 hours ago) and read 4822 times:

Quoting SlamClick (Reply 8):
I still think it should be part of the page header.

Definitely. Soon to be joined by "The 380 only has 2 reversers? Surely this will cause it to break up in mid-air and land on John Leahy!"



"There are no stupid questions, but there are a lot of inquisitive idiots."
User currently offlineKELPkid From United States of America, joined Nov 2005, 6343 posts, RR: 3
Reply 11, posted (8 years 4 days 15 hours ago) and read 4809 times:

Quoting Starlionblue (Reply 10):
Definitely. Soon to be joined by "The 380 only has 2 reversers? Surely this will cause it to break up in mid-air and land on John Leahy!"

And don't you forget, those are trust reversers, too  Wink



Celebrating the birth of KELPkidJR on August 5, 2009 :-)
User currently offlineAC773 From Canada, joined Nov 2005, 1730 posts, RR: 2
Reply 12, posted (8 years 4 days 9 hours ago) and read 4734 times:

I also need info on a strange A320 noise, but what's been described above doesn't seem to match it. What I hear happens between boarding and pushback. It's a very loud, high-pitched whine that goes on for a good few minutes. It stops, and then starts again for another couple of minutes. What on earth is this?

Also, did Airbus hire GKirk to install their overhead bins? Every 320 family aircraft I've been on has heavy "bin rattle" on taxi and landing. I've never experienced anything like this on a Boeing, so I'm assuming it's just the "Frenchness" showing through.  Wink

-AC773



Better to be nouveau than never to have been riche at all.
User currently offlineN8076U From United States of America, joined Jun 2006, 425 posts, RR: 9
Reply 13, posted (8 years 4 days 8 hours ago) and read 4726 times:

Quoting AC773 (Reply 12):
What I hear happens between boarding and pushback. It's a very loud, high-pitched whine that goes on for a good few minutes.

Could be the hydraulic pumps you are hearing, as those put out a high-pitched whine.

Quoting AC773 (Reply 12):
Every 320 family aircraft I've been on has heavy "bin rattle" on taxi and landing. I've never experienced anything like this on a Boeing,



The A320 fuselage flexes quite a bit more than a similarly sized Boeing, like the 737. That is why the stowbins tend to rattle, creak and groan a bit more. It is also fun to watch the stowbins undulate if you are sitting all the way in the back through turbulence.

Chris



Don't blame me, I don't work here...
User currently offlineSlamClick From United States of America, joined Nov 2003, 10062 posts, RR: 68
Reply 14, posted (8 years 4 days 7 hours ago) and read 4711 times:

Quoting N8076U (Reply 13):
Could be the hydraulic pumps you are hearing, as those put out a high-pitched whine.

Good illustration of the wisdom of NEVER going back to change an answer unless you uncover hard data that contradicts your first guess.

The first answer that occurs to you does so for a reason.
The second is just self-doubt.

It is the PTU.



Happiness is not seeing another trite Ste. Maarten photo all week long.
User currently offlineN8076U From United States of America, joined Jun 2006, 425 posts, RR: 9
Reply 15, posted (8 years 4 days 2 hours ago) and read 4660 times:

Quoting SlamClick (Reply 14):
Good illustration of the wisdom of NEVER going back to change an answer unless you uncover hard data that contradicts your first guess.

Different answer for a different question. If you read into what "AC773" said:

Quoting AC773 (Reply 12):
but what's been described above doesn't seem to match it. What I hear happens between boarding and pushback. It's a very loud, high-pitched whine that goes on for a good few minutes. It stops, and then starts again for another couple of minutes.

"AC773" seemed to be asking about a different sound, rather than than the infamous "barking dog", since I wouldn't characterize the PTU sound as a high-pitched whine, but rather a low pitched growl. But the electric hydraulic pumps sure do fit that profile, as those pumps make a very high pitched whine that does not sound like a barking dog in any way.

The timing also makes me think he's talking about the electric hydraulic pumps. The cargo doors are hydraulically powered on the A320. During/after boarding but before pushback, the yellow system hydraulics would come on should someone close a cargo door, and will continue to run for a bit after the cargo door open/close switch is released. This sound happening twice, once for each cargo door before pushback makes this explanation seem more correct than the default PTU answer. And he did not state that it also happened during pushback, taxi and takeoff, like the PTU sound would have.

Chris

[Edited 2006-07-20 10:09:16]


Don't blame me, I don't work here...
User currently offlineBri2k1 From United States of America, joined Dec 2004, 988 posts, RR: 4
Reply 16, posted (8 years 3 days 22 hours ago) and read 4636 times:

Quoting SlamClick (Reply 8):
It took me nearly an hour to come up with the thread I linked to in post #3

 Wow! that's dedication!



Position and hold
User currently offlineIlikeyyc From United States of America, joined Dec 2003, 1373 posts, RR: 20
Reply 17, posted (8 years 3 days 21 hours ago) and read 4625 times:

Quoting SlamClick (Reply 8):
...and got nothing. Eventually I dredged it up by going through all my posts in old Tech/Ops threads. So maybe the search function ain't all that wonderful and maybe its okay if this one pops up from time to time.

This is directed at everyone who uses the "Search Topic" feature:

Say you are searching for "A320 Noise". You must put the stars (*) around your search, or else the only threads that will be retuned are the ones with a title of "A320 Noise".

Examples (click on the link to see the search results):

A search for A320 Noise
vs.
A search for *A320*Noise*

*a320*barking*

*a320*sound*

see also Is Anything Being Done To Improve The Search? (by Corey07850 Jul 16 2006 in Site Related)



Fighting Absurdity with Absurdity!
User currently offlineStarlionblue From Greenland, joined Feb 2004, 16991 posts, RR: 67
Reply 18, posted (8 years 3 days 19 hours ago) and read 4614 times:

Good tips Ilikeyyc! Thanks.


"There are no stupid questions, but there are a lot of inquisitive idiots."
User currently offlineKELPkid From United States of America, joined Nov 2005, 6343 posts, RR: 3
Reply 19, posted (8 years 3 days 17 hours ago) and read 4575 times:

Quoting Starlionblue (Reply 18):
Good tips Ilikeyyc! Thanks.

Definitely.

[human factors mode]The user should be shielded from having to use Unix shell wildcards in a search![/human factors mode]

The techie in me knows about Unix shell wildcards, and their application...however, the 1 year of college studies in human factors psychology tells me the user interface on the search should shield one from this.

Sorry, end of off-topic rant. I realize tech-ops isn't the place for this...

Brent



Celebrating the birth of KELPkidJR on August 5, 2009 :-)
User currently offlineIlikeyyc From United States of America, joined Dec 2003, 1373 posts, RR: 20
Reply 20, posted (8 years 3 days 16 hours ago) and read 4572 times:

You're welcome!

I got frustrated with it one day because I too was trying to search for something I knew existed, but the search engine would not find it. On a hunch I put the stars around it and it worked.

Quoting KELPkid (Reply 19):
[human factors mode]The user should be shielded from having to use Unix shell wildcards in a search![/human factors mode]

It is backwards. You are right, the user shouldn't have to put wild cards in the search, but if the user wants to return an exact phrase, then one should use " or whatever it is that they use for phrase matching. (I'm not a computer guy- I know how to turn it on and find the internet- that's it)



Fighting Absurdity with Absurdity!
User currently offlineBri2k1 From United States of America, joined Dec 2004, 988 posts, RR: 4
Reply 21, posted (8 years 3 days 14 hours ago) and read 4539 times:

It seems a little silly to complain about something that's clearly posted right on the search page:

Quoting Search Page (Emphasis Added):
  • Use "Seach Topic" to search through the topics of forum posts. Note that you can use * to match any character.
  • Use "Seach for username" to search through the usernames of those who posted in the forum. Note that you can use * to match any character.
  • Use "Search Topic & Body" to search for words that exist in either the topic or the message body. Type in more than one word in the "Search Topic & Body" field and the engine will find entries containing WORD1 AND WORD2. For instance, the keywords Boeing 747 will match all entries containing Boeing AND 747. If you wish to find entries containing an exact phrase, include the phrase in double quotes. A search for "Boeing 747" will match all entries containing the exact phrase Boeing 747. This field only finds full words and you can not use the wildcard character (*). For instance, a search for Boe* does not match Boeing.



Position and hold
User currently offlineStarlionblue From Greenland, joined Feb 2004, 16991 posts, RR: 67
Reply 22, posted (8 years 3 days 12 hours ago) and read 4515 times:

Quoting KELPkid (Reply 19):

[human factors mode]The user should be shielded from having to use Unix shell wildcards in a search![/human factors mode]

The techie in me knows about Unix shell wildcards, and their application...however, the 1 year of college studies in human factors psychology tells me the user interface on the search should shield one from this.

I also knew about Unix wildcards, but with Google not requiring them, I was out of practice and imagination  Wink



"There are no stupid questions, but there are a lot of inquisitive idiots."
User currently offlineRyDawg82 From United States of America, joined Sep 2001, 858 posts, RR: 8
Reply 23, posted (8 years 3 days 10 hours ago) and read 4503 times:

Alright...I have an airbus noise question....Although I don't know if anyone is still looking at this thread for reasons other than how to use the search function Big grin

I have noticed that Airbus 320 (The entire family) have a unique howl on approach that can be heard as the bird passes overhead. I can best describe the sound as that a C-5 makes taking off, but from a far distance. I am not talking about the distinct sounds this aircraft makes on takeoff, again it's just as the aircraft is flying overhead on approach, say 2500-3000 ft AGL...Can anyone explain to me what causes this?

Thanks,
Ryan



You can take the pup out of Alaska, but you can't take the Alaska out of the pup.
User currently offlineKELPkid From United States of America, joined Nov 2005, 6343 posts, RR: 3
Reply 24, posted (8 years 3 days 10 hours ago) and read 4499 times:

Quoting RyDawg82 (Reply 23):
Alright...I have an airbus noise question....Although I don't know if anyone is still looking at this thread for reasons other than how to use the search function Big grin

I have noticed that Airbus 320 (The entire family) have a unique howl on approach that can be heard as the bird passes overhead. I can best describe the sound as that a C-5 makes taking off, but from a far distance. I am not talking about the distinct sounds this aircraft makes on takeoff, again it's just as the aircraft is flying overhead on approach, say 2500-3000 ft AGL...Can anyone explain to me what causes this?

Which Engines (CFM or IAE)? Who's the Airbus operator? It makes a difference, if you're talking about the infamous A320 "buzzsaw" sound, I've only ever heard that on IAE V2500-powered airbii  Wink



Celebrating the birth of KELPkidJR on August 5, 2009 :-)
25 RyDawg82 : Hey....Again this isn't the buzzsaw sound heard when the engine are at higher power....This is simply a howling sound made by the aircraft, or perhaps
26 Post contains images KELPkid : Must've been the sound of the stealth guided missile being fired from BFI, PAE, or Renton by disgruntled Boeing employees Fortunately, they miss ever
27 Post contains images HAWK21M : Are they using Airbus Equipment Amazing Aircraft the A320.In fact the IC A320s APU sounds louder than the V2500 Engines. regds MEL
28 Arluna : I have heard this sound and it seems to me that Airbus should have found a way to isolate the PTU from the A/C structure so that the noise wouldn't be
29 Post contains images Scbriml : Isn't that the FAs doing the safetly briefing?
30 Post contains images KELPkid : I Wish, most US A320 operators now use the flip-down LCD screens and a canned video for the safety briefing Hey, gotta dig that chick on HP (I wonder
31 Bri2k1 : The first chick who speaks on the Ted video is cute too, but she's FAR too excited to be giving a safety briefing. The video actors have obviously nev
32 Post contains images AC773 : No, these days they've got the same video for both HP/US. No hot chicks, but there is a beautiful fly-by shot with an A320 in new colors.
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