The revision of the ICAO Environmental Technical Manual (Doc 9501), Volume II — Procedures for the Emissions Certification of Aircraft Engines, Fourth Edition, includes material that has been approved by the ICAO Committee on Aviation Environmental Protection (CAEP) during its eleventh meeting (CAEP/11) in February 2019. This manual is to be periodically revised under the supervision of the CAEP Steering Group and is intended to make the most recent information available to certificating authorities, aircraft engine emissions certification applicants and other interested parties in a timely manner, aiming at achieving the highest degree of harmonization possible. The technical procedures and equivalent procedures described in this edition are consistent with currently accepted techniques and modern instrumentation. In this respect, this edition is compatible with Amendment 10 of Annex 16, Volume II.

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