11/21/2023 0 Comments 2023 dnl contour meaning![]() ![]() An entire year's worth of flights from the airport are examined using sophisticated aircraft noise modeling programs. All the factors described above, plus many others, are calculated for the entire area surrounding an airport. DNL is a metric that reflects a person's cumulative exposure to sound over a 24-hour period, expressed as the noise level for the average day of the year on the basis of annual aircraft operations. To describe the effects of environmental noise in a simple, uniform and appropriate way, the day-night average sound level ( DNL) noise metric is used. A house one-half mile north of an airport may experience very different aircraft noise exposure over a day, week, and year than a school one mile south of that airport. Weather also plays a large role, since sound attenuates (dissipates) differently depending on weather conditions (wind speed and direction, temperature, etc.).ĭetermining how to capture the effects of all these considerations can become extremely complex very quickly. Noise experienced on the ground also depends on flight schedules, which can vary depending on the time of day, season of the year, or other operational factors. Is the aircraft operating at full power or partial power?.How quickly does each plane ascend and descend?.What is the flight path of the flights going overhead?.Are the aircraft taking off or landing?.What model aircraft and what type of engines are being used for each flight?.There are also numerous factors that determine how much aircraft noise is experienced on the ground: Source: Federal Agency Review of Selected Airport Noise Analysis Issues, Federal Interagency Committee on Noise, August 1992. Noise in small suburban areas compared with busy urban centers may be very different and result in various types of challenges when looking to address aircraft noise. As a result, the level of noise someone experiences day to day can depend on many factors. Noise comes from many sources, not just aviation. Using the Day-Night Average Sound Level.Recreational Flyers & Modeler Community-Based Organizations.Critical Infrastructure & Public Venues.Certificated Remote Pilots including Commercial Operators.Legislation & Policies, Regulations & Guidance.Data & Research Subnav: Data & Research 1.Airport Safety Information Video Series.Passenger Facility Charge (PFC) Program.Airport Coronavirus Response Grant Program.General Aviation & Recreational Aircraft.Vintage & Experimental Aircraft Program.Aviation Safety Draft Documents Open for Comment.
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