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• • <br /> • <br /> Our research has shown, on average, aircraft A- weighted noise levels were reduced by 3- <br /> • 4 decibels and C- weighted noise levels were reduced, by 5 -6 decibels along with a <br /> substantial reduction in the duration of the noise event. Since this evaluation is a <br /> comparison of averages, actual noise level reductions for individual aircraft departures <br /> ' could actually be greater potentially reducing the affects of late -night aircraft noise levels • <br /> in a significant way. As this procedure is implemented in the late -night hours when <br /> community noise levels are very low, the overall results in noise abatement can be very <br /> significant and could prevent people from awakening in the middle of the night. <br /> • Your cooperation with this very important noise abatement procedure is very much • <br /> • appreciated.. Thanks again for your help. <br /> Sincerely, • <br /> • <br /> Oeborah Ale Flint • <br /> Airside Operations Manager • <br /> • cc: . Walt Smith, Bay Area Hub Manager, FAA • <br /> Steve Grossman, Port of Oakland <br /> Airport- Community Noise Forum • . <br /> • <br /> • <br /> • <br /> • <br /> • <br /> • <br /> • <br /> • <br /> • <br />