ECAC.CEAC Doc 29 4th Edition Report

ECAC.CEAC Doc 29 4th Edition Report on Standard Method of Computing Noise Contours around Civil Airports Volume 3, Part 1 - Reference Cases and Verification Framework FOREWORD With the publication of the 4th Edition of the ECAC.CEAC Doc 29 European guidance on the standard method of computing noise contours around civil airports comes this new third volume. It follows: Volume 1 which provides a general and largely non-technical introduction to the topic, as well as practical advice to model users; and Volume 2 which recommends a specific methodology for calculating aircraft noise exposure around civil aerodromes. Those for whom the subject is new might usefully treat Volume 1 as a primer for Volume 2. Volume 3 consists of two parts. This Part 1 contains guidance for noise model developers to support their work in developing new noise models that produce results that are equivalent to those calculated by noise models that adhere to the methodologies defined in ECAC.CEAC Doc 29 Volume 2. For noise model developers, a set of reference cases is presented. This includes a comprehensive set of inputs which can be modelled using a development model, and a corresponding set of reference results against which the development model outputs may be checked. The reference cases test the various elements of the implementation of the noise calculation methodology defined in ECAC.CEAC Doc 29 Volume 2. A subsequent Volume 3 Part 2 is planned for a future edition of the guidance and will contain guidance for noise model operators on the validation of already ECAC.CEAC Doc 29 Volume 2 compliant noise models using noise measurements of actual aircraft events. Since Volumes 1 and 2 were published, a number of noise models have been developed based on the methodology. The developers of such models have collaborated to undertake the detailed comparative analysis that underpins this volume.