DNL65 For Dummies

There is a geographic area around every large airport where, according to a formula developed by the Federal Aviation Administration (FAA), the ‘noise’ level is equal to or greater than 65 decibels DNL (Day Night Level). That area is depicted on a noise exposure map (NEM) and referred to as the Noise Boundary or just

Runways

We love this image because it makes clear the confusing nomenclature of runways. Intro Sea-Tac is a category IIIb certified airfield, allowing operations in all but the worst conditions. There are three runways: Runway #1 16L/34R – 11,901 feet Runway #2 16C/34C – 9,426 feet Runway #3 16R/34L – 8,500 feet The southern ends of