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Glossary of Commonly Used Acoustic and Air Traffic Control Terms

Document Library
Port of Seattle
Noise Mitigation
Part 150
2002

This Port of Seattle glossary defines key acoustic and air traffic control terms used in airport noise policy discussions. It explains measurements like decibels (dB), A-weighted decibels (dBA), and the Day-Night Noise Level (DNL), which is a 24-hour average used to map noise exposure around Sea-Tac Airport. It also covers Federal Aviation Regulations (Parts 36, 91, and 161) that govern aircraft noise standards, phase-out schedules for older noisy aircraft, and the process for airports to adopt new noise rules.

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Notes

Port Of Seattle glossary defining key acoustic and air traffic control terminology used in airport noise measurement and management. Covers decibel (dB), dBA, dBC, DNL, DNL contour, Integrated Noise Model (INM), Single Event Noise, SEL (sound exposure level), Time Above, Instrument Landing System (ILS), Instrument Flight Rules (IFR), Visual Flight Rules (VFR), North Flow, South Flow, Part 36, Part 91, Part 161, stage 1/2/3 aircraft, Sea-Tac Airport noise rules, and grandfathered regulations. Published as part of the Part 150 Community Advisory Committee (CAC) Group and Meetings materials, July 1998.

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