Paragraph 4 Noise standards required for issue of a noise certificate to aeroplanes specified in articles 6(2), (6) and (9)
The noise levels specified in paragraph 3 of this Part of this Schedule may be exceeded at one or two of the measuring points specified in paragraph 2 if—
(a)
the sum of the excesses does not exceed 4 EPNdB;
(b)
at no measuring point is the excess greater than 3 EPNdB; and
(c)
the excesses are completely offset by reductions at the other measuring points.