# Commission Delegated Regulation (EU) 2019/945 of 12 March 2019 on unmanned aircraft systems and on third-country operators of unmanned aircraft systems, Division 2: INSTALLATION AND MOUNTING CONDITIONS

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

Test area:
The UA will be maintained above one reflecting (acoustically hard) plane. The UA shall be located at a sufficient distance from any reflecting wall or ceiling or any reflecting object so that the requirements given in Annex A of EN ISO 3744:2010 are satisfied on the measurement surface.
Sound measurement surface and microphone array:
The UA will be completely enclosed in a hemispherical measurement surface as par § 7.2.3 of EN ISO 3744:2010.
The number and position of the microphones is defined by Annex F of EN ISO 3744:2010.
The measurement surface shall have its origin at the point O lying in the ground plane directly below the UA.

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Source: https://www.legislation.gov.uk/eur/2019/945/annex/division/1/division/2 (the official version)
Page: https://openlegislation.uk/eu-regulation-2019-945/annex/division-1/division-2
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.