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What Was That Banging Noise?  
User currently offlineVS744 From United Kingdom, joined Aug 2001, 677 posts, RR: 1
Posted (12 years 5 months 4 weeks 1 day 16 hours ago) and read 1823 times:

Last night I flew DUB-LHR on a BMI A320-200.

When it was on the ground, either still or moving, there were a lot of banging noises coming from beneath in the hold/undercarriage type area. It wasn't a pleasent sound, and it stopped as soon as we left the ground....

I have been on the 319, 320 and 321, and never heard this noise!

anyone know what it was?

18 replies: All unread, jump to last
 
User currently offlineSuperfly From Thailand, joined May 2000, 39686 posts, RR: 75
Reply 1, posted (12 years 5 months 4 weeks 1 day 16 hours ago) and read 1745 times:

Ooooops, sorry! Embarrassment

That was me and some young chick I met at the airport.



Bring back the Concorde
User currently offlineAlaskaairlines From United States of America, joined Jan 2002, 2054 posts, RR: 16
Reply 2, posted (12 years 5 months 4 weeks 1 day 16 hours ago) and read 1732 times:

Well who knows, sure wouldn't be to appeasing.

-Dmitry


User currently offlineVs744 From United Kingdom, joined Aug 2001, 677 posts, RR: 1
Reply 3, posted (12 years 5 months 4 weeks 1 day 15 hours ago) and read 1716 times:

Put it this way, when he let the throttle go on the runway, I was just waiting for something to fall off.


User currently offlineHb-iqj From , joined Dec 1969, posts, RR:
Reply 4, posted (12 years 5 months 4 weeks 1 day 15 hours ago) and read 1704 times:

Same topic was already written about 10 days ago about an A330.

Probably it is something normal on Airbuses.


User currently offlineVs744 From United Kingdom, joined Aug 2001, 677 posts, RR: 1
Reply 5, posted (12 years 5 months 4 weeks 1 day 15 hours ago) and read 1692 times:

Do you know what the topic was called?

I havent heard this on any other airbuses, and I have been on a fair few.....


User currently offlineLBA From United Kingdom, joined Nov 2000, 494 posts, RR: 0
Reply 6, posted (12 years 5 months 4 weeks 1 day 15 hours ago) and read 1679 times:

Proabably the brakes. I've heard it on the A330.

User currently offlineVs744 From United Kingdom, joined Aug 2001, 677 posts, RR: 1
Reply 7, posted (12 years 5 months 4 weeks 1 day 15 hours ago) and read 1676 times:

nope, definately not. It was making it as soon as the engines started. The a/c wasn't moving.



User currently offlineUdo From , joined Dec 1969, posts, RR:
Reply 8, posted (12 years 5 months 4 weeks 1 day 15 hours ago) and read 1660 times:

I also heard that kind of loud noise in an AF A320-100 when we were still parked at the gate. It stopped when the aircraft started moving. But I haven't heard that on any other Airbus so far.

Regards
Udo


User currently offlineVs744 From United Kingdom, joined Aug 2001, 677 posts, RR: 1
Reply 9, posted (12 years 5 months 4 weeks 1 day 14 hours ago) and read 1656 times:

Its put me off Airbuses...........and I loved them before last night.

User currently offlineVapourTrails From Australia, joined Aug 2001, 1091 posts, RR: 1
Reply 10, posted (12 years 5 months 4 weeks 1 day 14 hours ago) and read 1644 times:
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VS744, here is the toic that was discussed recently.
http://www.airliners.net/discussions/tech_ops/read.main/32403/4/ I've never heard it on the A320, I would be a bit worried too if I had though!


User currently offlineVs744 From United Kingdom, joined Aug 2001, 677 posts, RR: 1
Reply 11, posted (12 years 5 months 4 weeks 1 day 14 hours ago) and read 1628 times:

VapourTrails,

Cheers for the link, I have read it all, and It looks as though it is the brakes....although it did it when we were standing still :?

Anyways, I figure that if it was a fault the pilot would not fly the a/c, so I guess its just down to a bad design on Airbuses part.

Its not the most pleasent sound to hear on an aircraft when you're about to take off!


User currently offlineAC_B777 From Canada, joined Aug 2000, 809 posts, RR: 13
Reply 12, posted (12 years 5 months 4 weeks 1 day 11 hours ago) and read 1595 times:

If it's the sound that I'm thinking of, then it is the hydraulic pump.
It's located around the center of the plane and it makes this aweful sound when it is turned on. I would describe it as two grinders in heat. It also bangs.
The reason for this pump is to provide hydraulic pressure to the plane. Whenever I ride the brakes on an Airbus plane, I turn this pump on so that the brakes work and anything on the plane that uses hydraulics works.
It's usually only used when the a/c is being moved or for engine start and taxi. When the plane is airborne, there would'nt really be a need for hydraulics as all the flight controls are elecric.
Anyway, I hope this is the answer to you question.
This noise does'nt mean that the plane is falling apart. It is perfectly normal so you can still continue to like and fly Airbus.

AC_B777



In life, some days you are the bug..... some days you are the windshield!
User currently offlineVs744 From United Kingdom, joined Aug 2001, 677 posts, RR: 1
Reply 13, posted (12 years 5 months 4 weeks 1 day 11 hours ago) and read 1588 times:

The noise was a sort of loud inconsistent knocking sound. A bit like as I described at the time "a horse kicking its back legs against the side of the aircraft".

I did originally think it was the containers in the hold knocking against each other, but it did it when the plane was stood still.

cheers for your answers so far......does anyone know if this happens a lot? and if it is the brakes/hydraulic pump, is it a design fault?


User currently offlineAvionic From Denmark, joined Nov 1999, 111 posts, RR: 1
Reply 14, posted (12 years 5 months 4 weeks 1 day 8 hours ago) and read 1544 times:

it is when the nose hear hits the rwy centerline lights, they protrude a bit from the tarmac, happens on all planes if the pilots keep the nose exactly on it....

User currently offlineDemoose From Canada, joined Mar 2001, 1952 posts, RR: 23
Reply 15, posted (12 years 5 months 4 weeks 1 day 7 hours ago) and read 1528 times:

I thought it was the landing gear rolling over the centre lights but as I found out from the previously linked post, its not. I've only heard this noise on the airbus and not on a boeing. I was sat in the middle of an Emirates A330 and heard a metallic banging sound every so often during taxi, like a sheet of metal being dropped. It didn't worry me one bit, I'm trying to think why it didn't worry me now but I think I just love planes so much and know what most noises in the cabin are; I just assumed it was perfectly normal - which it was! Certainly wouldn't say it was something that would put me off flying on an Airbus.

DEM



Take a ride...fly across the sky
User currently offlineRj777 From United States of America, joined Dec 2000, 1784 posts, RR: 2
Reply 16, posted (12 years 5 months 4 weeks 1 day 5 hours ago) and read 1503 times:

Maybe they installed a new lavatory downstairs!

 Laugh out loud


User currently offlineTK From Canada, joined Oct 2000, 247 posts, RR: 1
Reply 17, posted (12 years 5 months 4 weeks 1 day 5 hours ago) and read 1495 times:

This has already been discussed on the technical forum.

The noise, which is similar to someone hitting the landing gear with a sledge hammer is heard on the A320 and other Airbus aircraft each time the foot brakes are released.


User currently offlineJeff G From United States of America, joined Jan 2002, 436 posts, RR: 1
Reply 18, posted (12 years 5 months 4 weeks 23 hours ago) and read 1456 times:

AC_B777,

The grinding sound is the hydraulic PTU self-testing when the second engine starts. It usually only runs when there's low pressure from one of the engine pumps. There is an electric hydraulic pump that runs all the time when the engines are running, but it's not particularly loud, and you won't hear it start up usually. The yellow pump you turn on for towing is pretty noticeable from the cabin, but it is typically not turned on for flight. And, though the flight controls are controlled by computer, they are actuated hydraulically. Hydraulic power is essential to aircraft control, so your statement that it's not needed in flight isn't entirely accurate. Just thought you'd want to know.

As far as that banging sound is concerned, it's probably the sound of the brakes being released. There are huge drum brakes on the gear, and they can make a racket.


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