NOISE EXPOSURE MAPS.

SEC. 324. NOISE EXPOSURE MAPS. Section 47503 is amended—(1) in subsection (a) by striking “1985,” and inserting “a forecast period that is at least 5 years in the future”; and(2) by striking subsection (b) and inserting the following:“(b) Revised Maps.—If, in an area surrounding an airport, a change in the operation of the airport would establish a substantial new noncompatible use, or would significantly reduce noise over existing noncompatible uses, that is not reflected in either the existing conditions map or forecast map currently on file with the Federal Aviation Administration, the airport operator shall submit a revised noise exposure map to the Secretary showing the new noncompatible use or noise reduction.”.