FAA Order 5050.4B, effective April 28, 2006, provides the Federal Aviation Administration's Office of Airports with instructions for evaluating the environmental impacts of major federal actions at public-use airports, in compliance with the National Environmental Policy Act (NEPA). It updates and replaces the previous Order 5050.4A ('Airports Environmental Handbook'), which had been in use for over 20 years. The order covers processes for analyzing environmental effects, including noise impacts, associated with airport development actions such as runway extensions and other airport improvements.Open full document
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FAA Order 5050.4B provides implementing instructions for the National Environmental Policy Act (NEPA) as applied to airport actions. It supplements FAA Order 1050.1E and substantially updates and replaces Order 5050.4A, the ‘Airports Environmental Handbook.’ The order guides FAA’s Office of Airports in analyzing environmental effects of major Federal actions involving public-use airports.