# The Air Navigation (Noise Certification) Order 1990, Paragraph 3


(1) An aeroplane specified in the 1st column of the following Table shall not, at the point referred to in paragraph 2 of this Part of this Schedule, exceed in the noise certification reference conditions the noise level specified in the 2nd column of that Table, as shown by flying trials.
TABLE
Number of Seats
Noise level in LAX at measurement point
1
80
2
84
(2) The necessary corrections shall be made where flying trials are carried out in conditions other than the noise certification reference conditions.

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Source: https://www.legislation.gov.uk/uksi/1990/1514/schedule/1/part/VII/paragraph/3 (the official version)
Page: https://openlegislation.uk/air-navigation-noise-certification-order-1990/schedule-1/part-VII/paragraph-3
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.