Topic Author
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Noise Restrictions.....

Wed Jun 19, 2002 12:54 pm

Am i to assume that the US has alot less noise restrictions than the EU?

When I was in the states about a month ago, i notice a hell of alot of B727's and old B737-200's, many of which were Delta shuttle examples in MCO, and they didn't seem to have hush kits on them.

Then just now, I see a pic of John Travolta's repainted B707 departing from LAX - was it making it's original noise i asked myself?

Anyone have any offerings?

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Joined: Tue Sep 25, 2001 1:02 pm

RE: Noise Restrictions.....

Wed Jun 19, 2002 1:27 pm

All aircraft operating in the USA must be stage 3 compliant as of 2000. There are loopholes however.
Firings, if well done, are good for employee morale.
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RE: Noise Restrictions.....

Wed Jun 19, 2002 10:34 pm

I the U.S. there are a lot of hushkitted Stage II aircraft and they are flying every day. I love these old birds like 727, DC-9,... In Zurich we have also a daily flight to Belgrad. Jat flies this route with DC-9-30....and 722.
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RE: Noise Restrictions.....

Thu Jun 20, 2002 3:51 am

JT's 707 appears to have been hushkitted.
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RE: Noise Restrictions.....

Fri Jun 21, 2002 4:28 am

There are two relatively economical methods to make a non-stage 3 airplane compliant to the stage 3 noise restrictions.
1. Install a hush kit that reduces the perceived noise level.
2. Reduce the operating weights of the airplane and/or use reduced flap setting to reduce the perceived noise level.
Re-engining is much more expensive and so far the DC-8-70 series (110 airplanes) has had the most success with this method. Would you believe that the '70 series will also meet the proposed stage 4 levels? Installing navigation and communication gear to meet the new requirements in those areas, especially in Europe, is the tough one for these birds.

The reason that I use "perceived" is that is how the rule is written. If you can either fly with a lower power setting for the same speed, fly at a higher speed for the same power setting, or climb out more quickly; your perceived noise level will be less. Also, engine out performance is checked; so a 3 engined airplane is easier to make stage 3 than a twin. i.e. 727 versus DC-9.
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Joined: Mon Nov 05, 2001 1:46 am

RE: Noise Restrictions.....

Fri Jun 21, 2002 4:45 am

That`s very interesting. I noticed that a lot of the 727 in the US do not have any hushkit, but they meet the stage III level with less thrust during the take off. That`s a very good idea! The difference in Europe is, that all older aircraft must have a hushkit. No other methods are allowed. Exceptions are the Russian Il-86 and Tu-134. They were allowed to fly until December 2002.
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Zat True?

Fri Jun 21, 2002 8:47 am

Are there 727s flying in the US with no hush kit at all? Any idea whose?