Videoconference, 9 April 2026 — The 92nd meeting of the European Aviation and Environment Working Group – Expanded (EAEG/92) reviewed proposals from the Aircraft Noise Modelling Task Group (AIRMOD) to update European guidance on aviation noise modelling.
Discussions focused on the proposed 5th edition of ECAC Doc 29 – the standard methodology for computing aircraft noise contours around civil airports, and a new methodology for rotorcraft noise calculation.
Members noted that the revised ECAC Doc 29 introduces targeted updates to improve harmonisation and consistency while maintaining alignment with developments within the ICAO framework. The proposed rotorcraft guidance, based on the NORAH (NOise of Rotorcraft Assessed by a Hemisphere-approach) methodology, was highlighted as an important step towards improving modelling of helicopter and emerging aviation operations.
Following the meeting, both documents were endorsed by the EAEG Expanded through written consultation, and will be recommended to ECAC Directors General of Civil Aviation for adoption.