Stage III definition

Date:         29 Jul 98 00:29:26 
From:         JF Mezei <jfmezei.spamnot@videotron.ca>
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The other day, I noticed a noisy plane overhead (I live 8.5 km from an
airport).

I looked and low and behold it was an F28. (Canadian Airlines).

It sounded just as "bad" as a DC-9 or 737-200.

Will Stage III only affect planes with a certain weight, or is it an all
encompassing regulation about noise ?

In other words, would it be possible to have, after STAGE III deadline,
an ultralight aircraft that makes more noise than a 707 not outfitted
with a hushkit ?

And as far as the F28 is concerned, are its engines much quieter than
that of the DC-9 or 737-200 ? Is the F28 considered Stage III compliant?