MD-80s are legalized by hushkits | Aviation International News

MD-80s are legalized by hushkits

A new Pratt & Whitney noise-reduction kit will permit operators of McDonnell Douglas MD-80 twinjets to meet Chapter 4 International Civil Aviation Organiza

By Ian Goold • Senior correspondent

December 13, 2006

A new Pratt & Whitney noise-reduction kit will permit operators of McDonnell Douglas MD-80 twinjets to meet Chapter 4 International Civil Aviation Organization noise rules that are scheduled for introduction in six months’ time. The heavyweight version of the equipment comprises an improved fan-inlet liner, a 16-lobe exhaust mixer, a muffler and a tabbed nozzle. A lower-cost, lightweight variant excludes one or two of these features since lighter aircraft are less noisy.

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