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Noise "Stages" And Rules

Bigphilnyc From United States of America, joined Jan 2002, 4073 posts, RR: 56
Posted (9 years 8 months 5 days 4 hours ago) and read 1302 times:

I am reading about noise abatement in some congressional report.

First, what are the stages? There are four of them, right?

What planes fall in which stages?

This report says that hushkits are bad becuase they increase fuel consumption on takeoff by 50%. Is this true? What palnes have hush kits?

What do they do to keep aircraft noise down?

-Phil

Phil Derner Jr.

5 replies: All unread, jump to last

Dnl65 From United States of America, joined Jun 2001, 78 posts, RR: 0
Reply 1, posted (9 years 8 months 5 days 3 hours ago) and read 1279 times:

There are currently three stages or chapters (as they are known in Europe) established by ICAO with Stage/Chapter 4 in final stage of development. In the US all aircraft weighing more than 75,000 pounds GTOW were required to meet stage 3 noise limits by January 2000 in accordance with the Airport noise and capacity Act. This could be done by meeting the rule at certification, modification of the engine (hush-kit) or re-engineing. Most of the modified airplanes went to the desert in the industry downturn following 9/11 although a few are still operating.

Bio15 From Colombia, joined Mar 2001, 1089 posts, RR: 7
Reply 2, posted (9 years 8 months 4 days 23 hours ago) and read 1241 times:

What determines the noise level reduction? Is it a specific limit like "can't sound above 120dB"?

-Alfredo

Timz From United States of America, joined Sep 1999, 6468 posts, RR: 8
Reply 3, posted (9 years 8 months 4 days 23 hours ago) and read 1240 times:

Maybe Appendix B will work:
http://www.access.gpo.gov/nara/cfr/cfrhtml_00/Title_14/14cfr36_00.html

Bigphilnyc From United States of America, joined Jan 2002, 4073 posts, RR: 56
Reply 4, posted (9 years 8 months 3 days 23 hours ago) and read 1160 times:

So what planes fall under each category? Any aircraft having trouble meeting such deadlines?

Phil Derner Jr.

Brons2 From United States of America, joined Sep 2001, 2969 posts, RR: 5
Reply 5, posted (9 years 8 months 3 days 16 hours ago) and read 1140 times:

Most of the modified airplanes went to the desert in the industry downturn following 9/11 although a few are still operating.

I'd say NW has about 150 of them! Wink/being sarcastic