Re: Phase III Engine

Date:         20 Nov 97 02:53:42 
From: (J. Rymsza)
Organization: University of Washington, Seattle
References:   1 2 3 4
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>If I recall correctly, the US permits "averaging" of some of the values,
>while the EU does not.  Thus if the noise is a touch too high at one point,
>but lower than the limit at another, the FAA will accept the certification
>while the EU's JAA won't.

In regards to airport noise mitigation at ground level, aircraft dB output
is also averaged, in most cases, over an entire year.  Serious noise
mitigation in the US is, quite frankly, a joke.

James A. Rymsza ( Architect - UW Design Services
    ..........  Box 352215 (work) 221-4325 (fax) 543-4117  ..........