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B737-112
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Joined: Tue Nov 30, 1999 6:01 pm

757-200, Loud Air Rushing Sound After Landing

Tue Dec 11, 2001 4:34 pm

I've noticed several times now at BUR that right after the UPS 757 lands and is taxiing back to parking there is an extremely loud sound that lasts a few seconds to a maximum of a minute. It's so loud that it even blocks out all other noises around it, including its own engine whine and other jet departures. The only things I can think of is possibly the APU temporarily being at a much faster RPM (if that's possible) or an oxygen bleed from the aircraft once it's no longer needed. If that's the case why is it only something I hear with the 752?

Thanks so much, Ryan

 
Rick
Posts: 125
Joined: Mon Dec 13, 1999 9:37 am

RE: 757-200, Loud Air Rushing Sound After Landing

Tue Dec 11, 2001 10:11 pm

Hi there:
There have been numerous post over the last year or so including an origional from me about this noise. I bet you only hear it on the 757's with the PW 2000 engines. Some examples of U.S. airlines that fly the PW2000 are: Delta, United, North West, and the old ex TWA. Some inside people from the airline mechanics industry answered these post but they have since been arcived or deleted. I am not a mechanic, so I will not go into detail, but the noise is the 14th stage airbleed that opens to release air to prevent compressor backfires during rapid deceleration. The air is coming straight out of the core of the engine, so it is very hot and that causes a volitile reaction when it hits the cool outside air. I love the 757, love to fly on it, especially the PW 2000 ones because of that grand finish they make at the end. "And the trombone section stood up!", quote taken from a very good airliners magazine a while ago.
 
cosync
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Joined: Sat Nov 17, 2001 7:53 pm

RE: 757-200, Loud Air Rushing Sound After Landing

Tue Dec 11, 2001 10:17 pm

it could be the thrust reversers!!!!!!!!!
 
VC-10
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Joined: Tue Oct 26, 1999 11:34 am

RE: 757-200, Loud Air Rushing Sound After Landing

Tue Dec 11, 2001 10:42 pm

It's not the temperature that would cause the noise but the high pressure, around 200 psi
 
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B737-112
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RE: 757-200, Loud Air Rushing Sound After Landing

Wed Dec 12, 2001 4:36 am

Rick, I've haven't noticed a previous post on this subject, sorry if I missed it. The thing is I've never heard this noise happen during the landing roll.

Cosync, the sound happens after the aircraft has pulled out of reverse and is taxiing to parking.

 
RyDawg82
Posts: 833
Joined: Fri Sep 14, 2001 8:30 am

RE: 757-200, Loud Air Rushing Sound After Landing

Wed Dec 12, 2001 6:33 am

Heyas,

Well I don't wish to be one who sits and yells at you becuse this has been talked about before....So Heres where to find the exact information on this topic....

Run a search for "757 Reversers" as the subject and "ALL DATES"

You will notice the topic started 07/30/01 "757 Reversers" That has great info, and also,
"757 Water Sound In Thrust Reverser?" on 08/06/01....Let us know if we can help anymore..RyRy
You can take the pup out of Alaska, but you can't take the Alaska out of the pup.

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