Community Research and Development Information Service - CORDIS


SOURDINE I I Report Summary

Project ID: 11011
Funded under: FP5-GROWTH
Country: Netherlands

New approach to aircraft noise reduction

With the continuing growth of air traffic as well as the ever increasing level of urbanisation around most airports in Western Europe, the impact of aircraft noise and emissions on the quality of life for the surrounding communities has become a serious issue to be dealt with. Many European airports already face the conflicting problems of increasing their airport capacity to meet the amount of traffic, and the increasing pressure from the general public to reduce environmental impact, particularly noise and emissions, of the increased traffic volume.

Many efforts are already being undertaken to reduce the source noise itself by the introduction of more silent aircraft and engines. On the other hand, a further solution to noise reduction around an airport is the definition of new approach and departures procedures. By modifying or optimising the operations and traffic flow of aircraft around the airport, it should be possible to achieve noise reduction.

The noise assessment results show that all Sourdine II procedures provide significant noise reduction as compared with current day practice. With single event simulations, it has been demonstrated that the SOURDINE II reference approach procedure shows benefits more than 5dBA in a very large range of the procedure.

From all approach procedures Sourdine II arrival procedure III, featuring an increased final glide path angle, provides the largest noise benefit compared to the reference procedure.

The optimized departure procedures featuring optimized thrust management provide noise reduction in the targeted zones compared to current PANS-OPS procedures, either close-in or at distant positions.

The distribution of the fleet mix will influence the shape of the noise contours considerably (i.e. unbalanced use of runways).

Noise assessment conclusions are the same (i.e. slight differences depending on fleet-mix flow) for all scenarios.

Major noise benefits are mainly determined by higher altitudes for approaches while for departures on the thrust settings.

It is recommended to perform flight trials in a low-density situation (e.g. at night) to get detailed feedback on aircraft performance as well as pilot and controller acceptability from hands-on experience. Results from these flight trials can support additional assessments like performed in this project to reach the ultimate goal: continuous descent approaches during peak-hour operations at major European airports while maintaining or even improving capacity and safety.

Reported by

National Aerospace Laboratory (NLR)
Anthony Fokkerweg 2
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