Business aircraft cabins are generally not quiet. Not with the turbulent boundary-layer rush of air around the fuselage at Mach 0.85 and the whine of a couple of jet engines no great distance from the comfy chairs. Then there are the pumps, hydraulics, fans, gears, actuators, electric motors, worn bearings and air distribution through the metal ductwork, not to mention the occasional hum of the microwave and induction oven, the rattling of glasses and flatware in the galley and that giant sucking sound coming from the lavatory.
Chemical giant BASF is claiming its Basotect open-celled melamine foam is both improving sound insulation and saving weight in the Russian Helicopters Mi-8. Used for an executive cabin refurbishing, it has cut interior noise from 85 to 80 dB. It has also saved 530 pounds, compared with the previous insulation arrangement. The special foam is affixed to “selected noise-intensive points,” at a thickness of 40 mm.
E-A-R Thermal Acoustics Systems (Stand 2145) is improving acoustic insulation aboard business jets as it endeavors to cut the most annoying cabin noises on a case-by-case basis.
Silentium Air introduced its 300 series, a customized noise-reduction kit developed expressly for the Bombardier Challenger 300.
Silentium Air has received FAA STC approval for its Silentium Air 300 soundproofing system for the Bombardier Challenger 300. According to Nicholas Houseman, the company’s president, the system will “generally reduce overall cabin noise levels by at least three decibels, which approximately represents an average 30-percent reduction in perceived noise throughout the cabin.
Servizi Elicotteristici Italiani (SEI) has received EASA certification for its lightweight cabin-noise and vibration-reduction system called Silens. The system was approved on an AgustaWestland AW139 and FAA certification is expected early this year.
A new thermal/acoustic barrier package promises to reduce cabin noise by as much as 30 percent. The Silentium Air SPS 360 is a product of Aviation International Management Services (AIMS) of Montreal, which is supplying the kits to exclusive marketing agent Zenith Jet, also of Montreal.
A passive sound-reduction kit for the Pilatus PC-12 lowers cabin noise by 55 percent in the speech interference level and by 80 percent in the average “A” weighted scale, according to Western Aircraft, the Boise, Idaho company offering the kit. The kit uses a variety of soundproofing materials installed throughout the cabin of the turboprop single, adding between about 90- and 120 lb to the aircraft’s empty weight. The kit costs $21,602.
Aerospace Concepts LLC of St. Laurent, Quebec, comes to NBAA 2006 to introduce new lightweight sound-proofing materials, along with its advanced interior design capabilities. The company has recently completed interior projects on its 55th wide-cabin business jet.