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What Do The Icao Noise Regulations Mean?

Wed Mar 26, 2003 8:29 am

1 year ago the adoption of the ICAO Stage 3 noise regulations in Europe meant the end of the line for several types including the BAC 1-11, DC-9 and 727 in these countries.

What exactly are the noise levels referred to by the various ICAO noise Stages? Additionally, what are the comparative noise levels of, say, 737NG vs 737 Classic and MD80 and 747-400 vs 747-200?

Any info would be greatly appreciated.


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Joined: Fri Sep 17, 1999 7:43 am

RE: What Do The Icao Noise Regulations Mean?

Wed Mar 26, 2003 9:57 am

Dunno about ICAO-- but if they're similar to FAR36:

FAR36 sets limits to takeoff noise (measured along the extended runway centerline a specified distance from the start of takeoff roll), approach noise (measured along the extended centerline?), and sideline noise. The limits are calculated from the logarithm of the MTOW for takeoff noise, and from landing weight (?) for approach noise (and sideline?). Also different limits for 2-engine/3-engine/4-engine, maybe?

And noise is measured in effective perceived decibels-- some frequencies are considered noisier than others.
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RE: What Do The Icao Noise Regulations Mean?

Tue Apr 01, 2003 9:32 am

ICAO=International Civial Aviation Authority (Don't know why it is an "O"). But basicaly you can't make this much noise of certain aera's at certain times.
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RE: What Do The Icao Noise Regulations Mean?

Fri Apr 04, 2003 9:01 pm

I think the 'O' stands for Organisation, mate.  Smile/happy/getting dizzy


RE: What Do The Icao Noise Regulations Mean?

Mon Apr 14, 2003 9:36 am

ICAO Annex 16, Chapter 1, Chapter 2 and Chapter 3 are equivalent to -
US FAR 36, Stage 1, Stage 2 and Stage 3...
(noise standards - measurements etc...)
Some old 747-100 and 200s are considered Chapter 2, but it is possible to reduce the effective noise by reducing the weight at which they are certificated to takeoff and/or land... - In that case, a little plaque may be placed in the flight deck, indicating "Chapter 2" or "Chapter 3"... i.e. an old 747-200 with T/O certification for 351 tonnes, might be restricted to 345 tonnes to comply with Chapter 3...
Newer 747-200 and all -300s are Stage 3 - Chapter 3...
ICAO Int'l Civil Aviation Organization (Montreal, PQ) - ICAO is a branch of UN...
Some ICAO field offices at other locations - Lima, Peru - Paris, France... etc...
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