Raisbeck Commercial Air Group said FAA granted it a supplemental type certificate for a Stage 3 noise reduction system designed for the heaviest Boeing 727 takeoff weight, more than 200,000 pounds. Raisbeck said the STC completes its Stage 3 offerings for all takeoff weights, providing Stage 3 certification noise levels at takeoff, sideline and approach that are "well below" hushkitted airplanes of the same weight.


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