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Environmental Technical Manual ______ Doc 9501 AN/929 Environmental Technical Manual ________________________________ Volume I Procedures for the Noise Certification of Aircraft CAEP11 Steering Group 2018 Approved Revision (Based on Third Edition — 2018) International Civil Aviation Organization Published in separate English, Arabic, Chinese, French, Russian and Spanish editions by the INTERNATIONAL CIVIL AVIATION ORGANIZATION 999 Robert-Bourassa Boulevard, Montréal, Quebec, Canada H3C 5H7 For ordering information and for a complete listing of sales agents and booksellers, please go to the ICAO website at www.icao.int First edition, 2010 Second edition, 2015 Third edition, 2018 Doc 9501, Environmental Technical Manual Volume I, Procedures for the Noise Certification of Aircraft Order Number: 9501-1 ISBN 978-92-9258-369-9 © ICAO 2018 All rights reserved. No part of this publication may be reproduced, stored in a retrieval system or transmitted in any form or by any means, without prior permission in writing from the International Civil Aviation Organization. AMENDMENTS Amendments are announced in the supplements to the Products and Services Catalogue; the Catalogue and its supplements are available on the ICAO website at www.icao.int. The space below is provided to keep a record of such amendments. RECORD OF AMENDMENTS AND CORRIGENDA AMENDMENTS CORRIGENDA Date Date Entered Date Date Entered No. applicable entered by No. of issue entered by (iii) FOREWORD This revision of the Environmental Technical Manual (Doc 9501), Volume I — Procedures for the Noise Certification of Aircraft, Second Edition, includes material that was approved by the ICAO Committee on Aviation Environmental Protection during its tenth meeting (CAEP/10) in February 2016. 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 11 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 (http://www.icao.int/) 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. Comments concerning this manual should be addressed to: The Secretary General International Civil Aviation Organization 999 Robert-Bourassa Boulevard Montréal, Quebec Canada H3C 5H7 ______________________ (v) TABLE OF CONTENTS Page Acronyms and abbreviations ............................................................................................................................. (ix) Nomenclature: Symbols and Units .................................................................................................................... (xi) Chapter 1. Introduction ............................................................................................................................... 1-1 1.1 Purpose ............................................................................................................................................... 1-1 1.2 Document structure ............................................................................................................................. 1-1 1.3 Explanatory information ..................................................................................................................... 1-1 1.4 Equivalent procedures ........................................................................................................................ 1-2 1.5 Technical procedures .......................................................................................................................... 1-2 1.6 Conversion of units ............................................................................................................................. 1-2 1.7 References .......................................................................................................................................... 1-3 Chapter 2. General guidelines ..................................................................................................................... 2-1 2.1 Applicability of current and previous amendments to Annex 16, Volume Ito ................................... 2-1 2.2 Changes to aircraft type designs involving “derived versions” .......................................................... 2-2 2.3 Changes to aircraft type designs involving “no-acoustical changes” ................................................. 2-2 2.4 Recertification .................................................................................................................................... 2-4 2.5 Noise compliance demonstration plans .............................................................................................. 2-6 2.6 Noise certification reports ................................................................................................................... 2-7 Chapter 3. Technical procedures applicable for noise certification of all aircraft types ....................... 3-1 3.1 Noise measurement procedures .......................................................................................................... 3-1 3.2 Aircraft position and flight path measurement ................................................................................... 3-9 3.3 On-board flight data acquisition ......................................................................................................... 3-21 3.4 Time synchronization of measured data ............................................................................................. 3-22 3.5 Calculation of confidence intervals (CIs) ........................................................................................... 3-24 3.6 Adjustment of aircraft noise levels for the effects of background noise ............................................. 3-40 3.7 Noise reduction systems ..................................................................................................................... 3-48 3.8 Calculation of the speed of sound ....................................................................................................... 3-50 3.9 Reference tables used in the manual calculation of effective perceived noise level ........................... 3-50 Chapter 4. Guidelines for subsonic jet aeroplanes, propeller-driven aeroplanes over 8 618 kg, helicopters and tilt-rotors evaluated under Annex 16, Volume I, Appendix 2 .......................................... 4-1 4.1 Explanatory information ..................................................................................................................... 4-1 4.2 Equivalent procedures information ..................................................................................................... 4-53 4.3 Technical procedures information ...................................................................................................... 4-92 (vii) Table of Contents (viii) Page Chapter 5. Guidelines for propeller-driven aeroplanes not exceeding 8 618 kg evaluated under Appendix 6 of Annex 16, Volume I ................................................................................................................ 5-1 5.1 Explanatory information ..................................................................................................................... 5-1 5.2 Equivalent procedures information ..................................................................................................... 5-10 5.3 Technical procedures information ...................................................................................................... 5-26 Chapter 6. Guidelines for helicopters not exceeding 3 175 kg evaluated under Appendix 4 of Annex 16, Volume I ......................................................................................................................................... 6-1 6.1 Explanatory information ..................................................................................................................... 6-1 6.2 Equivalent procedures information ..................................................................................................... 6-10 Chapter 7. Guidelines for tilt-rotors evaluated in accordance with Chapter 13 of Annex 16, Volume I ......................................................................................................................................... 7-1 7.1 Explanatory information ..................................................................................................................... 7-1 Chapter 8. Guidelines on flight test windows and adjustment of land-use planning noise data measured in accordance with Attachment H of Annex 16, Volume I ......................................................... 8-1 8.1 Explanatory information ..................................................................................................................... 8-1 8.2 Equivalent procedures information ....................................................................................................
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