BS ISO 5305:2024 PDF

1   Scope This document specifies methods for recording the time history of instantaneous sound pressure in several positions around rotor powered unmanned aircraft systems ( UAS ) with a maximum take-off mass (MTOM) of less than 150 kg in accordance with ISO 21895 [ 9 ] . The UAS can be either electrically powered or fuel-powered. It is not applicable to the tilt-rotor or tilt-wing UAS . It does not account for the UAS noise certification or regulation This document can also be applied to measure the sound pressure from a UAS with either multiple rotors or a single rotor. This document specifies:

a) recommendations and requirements for three different test facilities for the noise measurements of various categories of multirotor-powered UAS :

— requirements and recommendations of UAS noise tests in anechoic chambers (Clause 7);

— requirements and recommendations of UAS noise tests in anechoic wind tunnels (Clause 8);