VS744
Topic Author
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What Was That Banging Noise?

Mon Jan 28, 2002 5:59 pm

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?
 
Superfly
Posts: 37735
Joined: Thu May 11, 2000 8:01 am

RE: What Was That Banging Noise?

Mon Jan 28, 2002 6:02 pm

Ooooops, sorry! Embarrassment

That was me and some young chick I met at the airport.
Bring back the Concorde
 
Alaskaairlines
Posts: 2326
Joined: Mon Jan 28, 2002 12:28 pm

RE: What Was That Banging Noise?

Mon Jan 28, 2002 6:16 pm

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

-Dmitry
 
VS744
Topic Author
Posts: 659
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RE: What Was That Banging Noise?

Mon Jan 28, 2002 6:50 pm

Put it this way, when he let the throttle go on the runway, I was just waiting for something to fall off.
 
hb-iqj
Posts: 175
Joined: Sun Dec 10, 2000 8:43 pm

RE: What Was That Banging Noise?

Mon Jan 28, 2002 6:53 pm

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

Probably it is something normal on Airbuses.
 
VS744
Topic Author
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RE: What Was That Banging Noise?

Mon Jan 28, 2002 6:59 pm

Do you know what the topic was called?

I havent heard this on any other airbuses, and I have been on a fair few.....
 
LBA
Posts: 496
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RE: What Was That Banging Noise?

Mon Jan 28, 2002 7:01 pm

Proabably the brakes. I've heard it on the A330.
 
VS744
Topic Author
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RE: What Was That Banging Noise?

Mon Jan 28, 2002 7:03 pm

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

 
Udo
Posts: 4288
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RE: What Was That Banging Noise?

Mon Jan 28, 2002 7:42 pm

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
Me & You & a Plane Named Blue...
 
VS744
Topic Author
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RE: What Was That Banging Noise?

Mon Jan 28, 2002 7:49 pm

Its put me off Airbuses...........and I loved them before last night.
 
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VapourTrails
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Joined: Fri Aug 17, 2001 9:30 pm

RE: What Was That Banging Noise?

Mon Jan 28, 2002 8:09 pm

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!
 
VS744
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RE: What Was That Banging Noise?

Mon Jan 28, 2002 8:16 pm

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!
 
AC_B777
Posts: 731
Joined: Sat Aug 19, 2000 5:15 am

RE: What Was That Banging Noise?

Mon Jan 28, 2002 11:02 pm

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!
 
VS744
Topic Author
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RE: What Was That Banging Noise?

Mon Jan 28, 2002 11:11 pm

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?
 
avionic
Posts: 107
Joined: Sat Nov 13, 1999 3:45 am

RE: What Was That Banging Noise?

Tue Jan 29, 2002 2:41 am

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....
 
Demoose
Posts: 1891
Joined: Thu Mar 08, 2001 8:06 am

RE: What Was That Banging Noise?

Tue Jan 29, 2002 3:17 am

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
 
rj777
Posts: 1578
Joined: Sat Dec 02, 2000 1:47 am

RE: What Was That Banging Noise?

Tue Jan 29, 2002 5:10 am

Maybe they installed a new lavatory downstairs!

 Laugh out loud
 
TK
Posts: 222
Joined: Tue Oct 31, 2000 11:41 am

RE: What Was That Banging Noise?

Tue Jan 29, 2002 5:24 am

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.
 
Jeff G
Posts: 438
Joined: Fri Jan 18, 2002 9:56 am

RE: What Was That Banging Noise?

Tue Jan 29, 2002 11:23 am

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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