Washington National Airport Flight Extension Test. Noise Monitoring Data Report.
FEDERAL AVIATION ADMINISTRATION WASHINGTON DC OFFICE OF ENVIRONMENT AND ENERGY
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This report summarizes noise measurements obtained during the Washington National Airport Flight Extension Test conducted during the summer of 1979. During this test, south departing turbojet aircraft were directed to fly over the Potomac River corridor an additional five miles prior to being directed toward their destinations. Monitoring sites were set up in the affected areas to determine the effect of the change in operations on the ambient noise levels. Equivalent noise levels Leq were obtained on an hourly basis and averaged for each site. The results show no statistically significant change in averaged equivalent noise levels at three sites. Significant decreases in Leq were recorded at four sites and five of the twelve sites observed some statistically significant increase in equivalent sound levels. Maximum levels dBA were also recorded for single aircraft events. The average maximum noise levels for the single event, during the afternoon period at Accokeek Park, for example, increased from 6.5 dBA to 13.5 dBA over the normal operational levels, varying with aircraft type. This increase in maximum levels, combined with the increased number of overflights from 0 to 5 per hour before to 15 to 20 per hour during the test period produced the increase in average equivalent noise levels in the southern region of the affected area.
- Civil Engineering