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Noise Restrictions.....  
User currently offlineLekky-Man From United Kingdom, joined Feb 2002, 371 posts, RR: 0
Posted (13 years 10 months 3 weeks 2 days 20 hours ago) and read 1937 times:

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?


6 replies: All unread, jump to last
User currently offlineBrons2 From United States of America, joined Sep 2001, 3035 posts, RR: 4
Reply 1, posted (13 years 10 months 3 weeks 2 days 19 hours ago) and read 1920 times:

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.
User currently offlineNewSwissair From Switzerland, joined Nov 2001, 282 posts, RR: 2
Reply 2, posted (13 years 10 months 3 weeks 2 days 10 hours ago) and read 1912 times:

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.

User currently offlineDc863 From Romania, joined Jun 1999, 1579 posts, RR: 2
Reply 3, posted (13 years 10 months 3 weeks 2 days 5 hours ago) and read 1881 times:

JT's 707 appears to have been hushkitted.

User currently offlineBroke From United States of America, joined Apr 2002, 1322 posts, RR: 3
Reply 4, posted (13 years 10 months 3 weeks 1 day 4 hours ago) and read 1864 times:

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.

User currently offlineNewSwissair From Switzerland, joined Nov 2001, 282 posts, RR: 2
Reply 5, posted (13 years 10 months 3 weeks 1 day 4 hours ago) and read 1855 times:

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.

User currently offlineTimz From United States of America, joined Sep 1999, 7212 posts, RR: 7
Reply 6, posted (13 years 10 months 3 weeks 1 day ago) and read 1844 times:

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

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