Butler National is nearing completion of an STC for a Learjet 20-series Stage 3 noise suppression device. The aircraft is subject to the FAA Modernization and Reform Act of 2012, which includes provisions that ban its operation in the U.S. after Dec. 31, 2015 for not meeting current FAA Stage 3 noise level requirements. Installation of the Avcon Noise Suppressor should allow continued use of the airplanes in 2016 and beyond. Butler projects installations of the Avcon Noise Suppressor STC will begin this fall.