Mecaer Aviation Group Receives EASA Certification for SILENS™ Lightweight Cabin Noise Reduction System for AW 139 Helicopter

Originally developed in Italy in collaboration with AgustaWestland, the system has been proven to dramatically improve passenger comfort, reducing noise levels and distribution in all flight conditions.


S.E.I. (Servizi Elicotteristici Italiani) S.p.A., a Mecaer Aviation Group company, has received certification for its lightweight cabin noise and vibration reduction system called SILENS. The system has been EASA certified on an AgustaWestland AW139 helicopter, with FAA certification expected early in 2010.

Originally developed in Italy in collaboration with AgustaWestland, the system has been proven to dramatically improve passenger comfort, reducing noise levels and distribution in all flight conditions. Flight tests have demonstrated a significant noise abatement in all conditions, with a remarkable reduction from 76 to 71 dB SIL4 at a cruise speed of 140 knots.

The system minimizes cabin noise and vibration levels using a self-supported separation barrier between the passenger cabin and the fuselage, allowing normal conversations between passengers without using headsets.

The SILENS system core is a high stiffness-to-weight ratio shell which guarantees full separation between the passenger cabin and fuselage structure. The shell is manufactured with extensive use of advanced composite materials and is mounted to the surrounding structure in just few discrete points by means of vibration and noise insulators.

The shell is complemented by a special soundproofing developed with analytical energy and noise abatement software models which have been validated with extensive test campaigns, using different state-of-the-art soundproofing materials, alternative geometries and special installation techniques.

S.E.I. S.p.A. director of its completions business unit, Davide Marucco, said, “The great thing about this system is that it maximizes cabin volume available for the passengers, it’s easy to remove to get access to the main aircraft systems for maintenance, and doesn’t increase the weight of the aircraft.

“Furthermore, our revolutionary system is compatible with a full range of corporate and VIP cabin layouts and can be retrofitted on all AW 139s, both with the hinged or sliding doors. In designing the SILENS in collaboration with AgustaWestland, our target was to guarantee the highest performance in terms of passenger comfort while having minimum impact on cabin volume and aircraft weight. All objectives have been achieved and customers have confirmed their satisfaction with the results,” he added.

SEI has completed more than 280 corporate and VIP interiors on the A 109 and AW 139 helicopters, and is currently working with AgustaWestland to develop VVIP interiors for the medium/heavy helicopter AW 101.

About S.E.I.:

S.E.I. , a subsidiary of the MECAER Aviation Group, manufactures components and major structural subassemblies for the aerospace industry and is a leader in helicopter interiors design, manufacturing and installation. SEI is an EASA approved Design (DOA), Production (POA) and Maintenance (MOA) organization and performs maintenance, repair, overhaul and modification services for a variety of customers, including OEMs, private owners, public and para-public operators.

About Mecaer Aviation Group:

MECAER, founded in 1902 and with headquarters in Borgomanero, Northern Italy, has design, manufacturing and support facilities across Europe and North America.

Mecaer Aviation Group’s service division specializes in helicopter engineering and systems integration, completions and modifications, manufacturing, qualification testing and certification, kitting and product support. Mecaer has also developed products suited to a range of helicopter models, including flight and actuation controls, landing gears for helicopters and very-light-jets (VLJ), and VIP cabin interiors.

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