# The Air Navigation (Noise Certification) Order 1987, Paragraph 1: Noise standards required for issue of a noise certificate to aeroplanes specified in articles 6(2), (6) and (9)


In this Part of this Schedule—
“the noise certification reference conditions” means conditions in which—
(i) atmospheric pressure at sea level is 1013.25 millibars;
(ii) ambient air temperature is 25°C;
(iii) relative humidity is 70%;
(iv) there is zero wind; and
(v) the maximum take-off and landing weights of the aeroplane are those at which noise certification is requested by the applicant for the certificate.

---
Source: https://www.legislation.gov.uk/uksi/1987/2212/schedule/1/paragraph/1 (the official version)
Page: https://openlegislation.uk/air-navigation-noise-certification-order-1987/schedule-1/paragraph-1
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.