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4th October 2016, Stamford, CT

Cutting broadband noise on the 737

At the end of January this year Boeing celebrated the first flight of the 737 MAX 8 which is powered by LEAP-1B engines from CFM International.

Hexcel supplies its HexTow IM7 carbon fibre for the engine fan blades and containment cases and in addition, the engine nacelles have an acoustic inner barrel that is manufactured from Hexcel engineered core and Acousti-Cap technology.

A full-scale model of the LEAP-1B engine. © Jim Anderson

Acousti-Cap honeycomb’s effectiveness results from a permeable cap material which is individually embedded into each honeycomb cell to create an acoustic septum.

This technology is a leading contributor to the 40% reduction of the area of acceptable noise contour of the 737 MAX engine over the legacy 737 NG, without any weight penalty. A section of acoustic inner barrel was on display at Hexcel’s stand at CAMX which was held in Anaheim, California last week.

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