bigphilnyc
Posts: 3874
Joined: Sat Jan 19, 2002 10:43 pm

Noise "Stages" And Rules

Fri Sep 26, 2003 3:38 am

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.
 
dnl65
Posts: 78
Joined: Fri Jun 22, 2001 5:52 am

RE: Noise "Stages" And Rules

Fri Sep 26, 2003 4:52 am

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
Posts: 1048
Joined: Fri Mar 23, 2001 8:10 am

RE: Noise "Stages" And Rules

Fri Sep 26, 2003 8:23 am

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

-Alfredo
 
timz
Posts: 6100
Joined: Fri Sep 17, 1999 7:43 am

RE: Noise "Stages" And Rules

Fri Sep 26, 2003 8:55 am

 
bigphilnyc
Posts: 3874
Joined: Sat Jan 19, 2002 10:43 pm

RE: Noise "Stages" And Rules

Sat Sep 27, 2003 8:46 am

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

Phil Derner Jr.
 
brons2
Posts: 2462
Joined: Tue Sep 25, 2001 1:02 pm

RE: Noise "Stages" And Rules

Sat Sep 27, 2003 3:38 pm

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
Firings, if well done, are good for employee morale.

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