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FAA FEDERAL AVIATION REGULATIONS <br />(FAR) PART 150 STUDY <br />DAY -NIGHT AVERAGE NOISE LEVEL (DNL) <br />DNL FACTORS <br />• Flight tracks <br />• Operations <br />• Runway geometrics <br />• 10- decibel addition to night operations <br />• Average times of activity AND inactivity <br />SINGLE EVENT NOISE MONITORING <br />• Locations selected based on complaints received <br />• Measurements taken over a few days <br />• Used to corroborate DNL data <br />DATA PROJECTIONS <br />• Master plan review <br />• Aviation trends <br />• Local development plans <br />• Operations /tenant surveys <br />PUBLIC INPUT <br />• Public information meetings <br />• Registered noise complaints <br />• Local /online posting of study updates <br />