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HAWK21M
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A320 Neo sound

Tue Dec 08, 2020 7:43 pm

The A320 Neo has a 1-2sec Grinding sound on Landing presuming on deploying the Thrust Reversers.
What exactly is causing that sound.
Sounds like Steel brakes getting applied on taxying Aircraft, only this is on Touchdown.
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AA737-823
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Joined: Wed Mar 01, 2000 11:10 am

Re: A320 Neo sound

Wed Dec 09, 2020 6:28 am

Can you post a link to a video, so we can all hear it?
Also, are you certain that it happens on both LEAP and PW-GTF engines?
Because those Pratts make a whole new library of weird noises, from startup to shut down!
 
flybaurlax
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Re: A320 Neo sound

Wed Dec 09, 2020 5:23 pm

I'm going to venture you're talking about the GTF. You can hear the grinding/growling noise at lower power settings. In Seattle, I can hear it and know instantly it's a DL A220 joining the LOC with the engines spooling from idle.

I'm curious what it is, too. Perhaps it's the gearbox?
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speedbird717
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Re: A320 Neo sound

Tue May 11, 2021 12:05 am

I'm curious what it is, too. Perhaps it's the gearbox?[/quote]

I believe you're referring to the howl from the PW1000 engines on some 320neo's and CSeries. These engines have what PW call a TALON combustor, I forget what it stands for but I'm sure it burns the fuel cleaner. The howl of these engines is created by the pressure changes in the combustion chamber when the engine is throttled up from idle. The PW4000 and 800 also make similar howling noises when spooling up and they all feature Pratt and Whitney's TALON combustors. Hope that helps.
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masi1157
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Joined: Sun Feb 06, 2011 11:56 am

Re: A320 Neo sound

Thu May 13, 2021 10:58 am

speedbird717 wrote:
The howl of these engines is created by the pressure changes in the combustion chamber...

I would call those "pressure changes" a resonance within the combustion chamber. It can destroy the engine if it gets too strong. Fortunately it is not that strong and appears only in trasient phases in PW1000 engines.


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