Notes
A noise survey conducted at twelve locations near residences and schools in Zone Three of Sea-Tac Airport, measuring sound levels from low-flying jet aircraft during landing approach and take-off. The study, conducted by Larry D. Ikenberry of the Washington Department of Social and Health Services, recorded A-scale sound levels for aircraft including the 707, 727, 737, 747, and DC-8, with all recorded levels exceeding 80 dBA and a maximum of 107 dBA. Results were analyzed using the Perceived Noise Level (PNL) system to assess the significance of noise exposure to nearby residents and schools.