# Commission Delegated Regulation (EU) 2019/945 of 12 March 2019 on unmanned aircraft systems and on third-country operators of unmanned aircraft systems, Division 4: CALCULATION OF SURFACE TIME-AVERAGED SOUND PRESSURE LEVEL

Extent: E+W+S+N.I.

The A-weighted surface time-averaged sound pressure level shall be determined at least three times for each UA configuration. If at least two of the determined values do not differ by more than 1 dB, further measurements will not be necessary; otherwise the measurements shall be continued until two values differing by no more than 1 dB are obtained. The surface time-averaged sound pressure level to be used for calculating the sound power level of a UA configuration is the arithmetic mean of the two highest values that do not differ by more than 1 dB.

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Source: https://www.legislation.gov.uk/eur/2019/945/annex/division/1/division/4 (the official version)
Page: https://openlegislation.uk/eu-regulation-2019-945/annex/division-1/division-4
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.