Noise measurements for UAS (unmanned aircraft systems)

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);

— requirements and recommendations of UAS noise tests in outdoor environments (Clause 9);

b) requirements and recommendations for the configuration of noise measurement for multirotor-powered UAS in hover, vertical take-off and landing, and horizontal cruise;

c) recommendations