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112 Aircraft Noise: A Toolkit for Managing Community Expectations Figure 7-1. Prediction curve from Fidell compared with original Schultz Curve (adapted from Fidell, Barber, 1991, as presented in ACRP Synthesis S02-01 Report, Effects of Aircraft Noise: Research Update on Selected Topics (145)). Cumulative Noise Metrics All cumulative noise metrics are expressions of the total amount of acoustic energy that is present. Most express a 1-second average of the noise energy that occurs during a selected period of time. Based on the needs of the governmental jurisdiction where each is used, they often are adjusted to weigh more heavily periods of the day that are considered to be more noise-sensitive. Those that the airport manager in the United States should become most familiar are the DNL Table 7-1. Utility of available noise metrics for public communication programs. Applicable Noise Metric Type in United States Application Cummulative Single Event Hybrid EIS/EA/Part 150 evaluations DNL, CNEL Comprehensive land use planning DNL, CNEL Lmax, SEL, Altitude Noise abatement planning DNL, CNEL Lmax, SEL, Slant NA, TA range distance, altitude Sound insulation DNL, CNEL, Leg Lmax Section 303(c) or 4(f) evaluations DNL, CNEL National Parks evaluations DNL TA ambient, TAUD Vibration assessments C-weighted SEL Sleep disturbance SEL Speech disturbance Lmax Public involvement and clarification DNL, CNEL Lmax, SEL, Slant NA, TA programs range distance, altitude DNL Day-Night Average Sound Level CNEL Community Noise Equivalent Level Leq Equivalent Sound Level Lmax Maximum Noise Level SEL Sound Exposure Level NA Number of Events Above (a user defined threshold) TA Time Above (a user defined threshold) TAUD Time Audible