TagNoise(310)

The Larson Davis Model 831 Technical Reference Manual provides comprehensive guidance for operating a handheld precision sound level meter and real-time frequency analyzer. The manual covers 27 chapters and 4 appendices addressing topics such as measurement setup, noise dose and exposure monitoring, time history logging, calibration, and data storage. It serves as a complete reference for professionals conducting acoustic measurements, including those relevant to environmental noise monitoring near airports.

This chapter from Sea-Tac Airport's 2013 Part 150 Noise Compatibility Study explains how aircraft noise is measured and analyzed around Seattle-Tacoma International Airport. It covers the basic properties of sound—including loudness, pitch, and duration—and explains why noise is measured on the logarithmic decibel (dB) scale rather than a standard linear scale. The chapter also outlines how noise contour modeling was conducted to assess the real-world impact of aircraft operations on surrounding communities.

This aerial map shows the area surrounding Seattle-Tacoma International Airport, including the cities of Burien and SeaTac, with runway designations 16R, 16C, and 16L marked along the western edge. Two colored flight-path or noise-contour lines — one purple and one gold — are overlaid on the map, tracing routes that extend east through residential neighborhoods, parks such as Sunset Park and North SeaTac Softball Fields, and past landmarks including Glacier High School. The map appears to be part of a noise or flight-path policy study documenting how aircraft departure and arrival corridors affect surrounding communities along SR 518 and adjacent streets.

This document explains the noise metrics used to evaluate aircraft noise around Seattle-Tacoma International Airport, including decibels (dB), A-weighted decibels (dBA), and the Day-Night Average Sound Level (DNL). It describes how sound is measured on a logarithmic scale, meaning noise levels don't add up the way ordinary numbers do, and explains why A-weighted measurements are the standard used by the FAA and EPA because they best match how human ears perceive sound. These concepts form the technical foundation for assessing the environmental impact of proposed flight arrival procedures at Sea-Tac.

This November 2012 Federal Aviation Administration report evaluates the environmental impacts of proposed new arrival flight procedures at Seattle-Tacoma International Airport, part of the 'Greener Skies Over Seattle' initiative. It includes detailed appendices covering noise modeling, effects of aircraft noise on communities, historic and endangered species considerations, and agency coordination records. The goal of the proposed procedures was to reduce fuel consumption and emissions while assessing changes in noise exposure for surrounding neighborhoods.

FAA Draft Environmental Assessment (EA), Volume 2 Appendices, for the Greener Skies Over Seattle project proposing new arrival procedures to Seattle-Tacoma International Airport (Sea-Tac Airport / KSEA), dated 31 October 2012. Appendices cover noise metrics (DNL, SEL, Leq, dBA), NIRS noise modeling technical report, aircraft operations and flight tracks, runway utilization, meteorological conditions, historic resource