Notes
Memorandum from Landrum & Brown, Inc. dated February 8, 2024, documenting updates to the noise modeling protocol for the SEA SAMP Environmental Review. Describes the transition from AEDT Version 3e to AEDT Version 3f (released December 13, 2023) for noise modeling at Seattle-Tacoma International Airport. Details aircraft substitutions no longer required in AEDT 3f: Boeing 737-7 (previously substituted with Boeing 737-8) and Cessna 408 SkyCourier (previously substituted with Shorts 330-200 Series). Tables document Aircraft Noise & Performance (ANP) modifications, airframe modifications, and engine modifications including changes to Airbus A320-NEO, Gulfstream G200, Cessna 208 Caravan, Raytheon Super King Air 200/C-12 Huron, Boeing 787-10 Dreamliner, and Bombardier CS100/CS300 entries. Part of Appendix J: Noise and Noise-Compatible Land Use under NEPA.