One of the world's most silent engines

The advanced design CFM56 engines more than meet all good-neighbor noise signature requirements. CFM56-powered aircraft are quiet enough to be operated at the most noise-sensitive airports, even during noise-restricted hours.

Although aircraft manufacturers are responsible for acoustic certification, engines make a significant contribution to overall aircraft noise. The CFM56 meets Stage 4 noise requirements, set by the International Civil Aviation Organization (ICAO).

A history of improvements to acoustic panels and engine nacelles, in terms of shape and air inlets, have all helped build today’s significantly quieter CFM56. Our engineers continue to work extensively in this area and we’re seeking a better understanding of the sources of internal noise.

CFM is committed to designing even more silent engines in the future to help meet the ACARE (Advisory Council for Aeronautics Research in Europe) objective of cutting aircraft noise in half by 2020. Next-generation CFM engines will power aircraft that keep total noise levels stable despite the strong growth expected in air traffic.