# The Air Navigation (Noise Certification) Order 1990, Paragraph 2


The noise levels required by paragraph 3 of this Part of this Schedule shall be measured in a level fly-over, at a point 300 metres vertically below the aeroplane.

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Source: https://www.legislation.gov.uk/uksi/1990/1514/schedule/1/part/V/paragraph/2 (the official version)
Page: https://openlegislation.uk/air-navigation-noise-certification-order-1990/schedule-1/part-V/paragraph-2
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.