ICAO tightens standards
ICAO adopted far stricter noise and CO₂ rules for next‑generation aircraft, explicitly including supersonic designs — a major certification hurdle for any high‑speed program. The new rules force designers to balance thrust and emissions and put noise and emissions modeling front and center for future CFD and propulsion work ( ).
ICAO’s Council adopted the new technical standards on 27 March 2026 and set 3 August 2026 as the effective date with global applicability from 1 January 2027. (icao.int) The aeroplane CO2 certification limit was tightened by 10% for new type designs, with that requirement applicable from 31 December 2031, and a more stringent CO2 regime for in‑production deliveries becomes applicable on 1 January 2035. (icao.int) ICAO raised noise certification margins by six effective perceived noise decibels (EPNdB) for large aeroplanes and by two EPNdB for smaller types, with the revised noise Standard applicable to new type designs from 1 January 2029. (icao.int) CAEP/13 recommended a specific supersonic noise standard (Chapter 15) that will require future supersonic designs to meet current subsonic noise limits as of 2029, and CAEP stated these new limits will be enforced by national governments as airworthiness requirements for new type certifications. (theicct.org) Noise certification continues to rely on LTO/EPNL flight‑test and analytical projection methods that explicitly require separation of broadband, tonal and external jet components and static‑to‑flight projections — procedures documented in ICAO Annex 16 and FAA guidance. (faa.gov) CO2 compliance will follow the Annex 16, Volume III certification procedures and be recorded in the ICAO Airplane CO2 Certification Database, which contains the fuel‑burn and engine performance metrics States of Design must certify. (faa.gov) Because the revised noise thresholds use EPNL‑based margins and the CO2 Standard quantifies fuel‑burn reductions, type‑certification demonstrations will require validated aeroacoustic prediction tools and propulsion fuel‑burn models as formal inputs under ICAO’s Annex 16 framework. (icao.int)
