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757-200, Loud Air Rushing Sound After Landing  
User currently offlineB737-112 From United States of America, joined Nov 1999, 886 posts, RR: 6
Posted (12 years 9 months 1 week 6 days 4 hours ago) and read 3371 times:

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

5 replies: All unread, jump to last
 
User currently offlineRick From United States of America, joined Dec 1999, 129 posts, RR: 0
Reply 1, posted (12 years 9 months 1 week 5 days 22 hours ago) and read 3302 times:

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.


User currently offlineCosync From Mexico, joined Nov 2001, 556 posts, RR: 0
Reply 2, posted (12 years 9 months 1 week 5 days 22 hours ago) and read 3290 times:

it could be the thrust reversers!!!!!!!!!

User currently offlineVC-10 From United Kingdom, joined Oct 1999, 3701 posts, RR: 34
Reply 3, posted (12 years 9 months 1 week 5 days 22 hours ago) and read 3285 times:
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It's not the temperature that would cause the noise but the high pressure, around 200 psi

User currently offlineB737-112 From United States of America, joined Nov 1999, 886 posts, RR: 6
Reply 4, posted (12 years 9 months 1 week 5 days 16 hours ago) and read 3236 times:

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.

User currently offlineRydawg82 From United States of America, joined Sep 2001, 864 posts, RR: 8
Reply 5, posted (12 years 9 months 1 week 5 days 14 hours ago) and read 3212 times:

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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