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FOREWORD

This revision of the Environmental Technical Manual (Doc 9501), Volume I - Procedures for the Noise Certification of Aircraft, Third Edition, includes material that was approved by the ICAO Committee on Aviation Environmental Protection during its eleventh meeting (CAEP/11) in February 2019. This revision was intended to make the most recent information available to certificating authorities, noise 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 13 of Annex 16, Volume I. This revision and subsequent revisions that may be approved by the CAEP Steering Group will be posted on the ICAO website under "publications" until the latest approved revision is submitted to CAEP for formal endorsement and subsequent publication by ICAO.

Comments on this manual, particularly with respect to its application and usefulness, would be appreciated from all States. These comments will be taken into account in the preparation of subsequent editions.