Ultra Electronics is launching an aggressive marketing campaign aimed at convincing turboprop operators that active noise control could make inroads into operators' increasing preference for regional jets.

Ultra produces UltraQuiet, a noise control system already standard on new Bombardier de Havilland Dash 8s and Saab 2000s. Ultra estimates there are over 200 older Dash 8s and some 180Saab 340s eligible for retrofit.

While the Dash 8 version, which will be fitted to six Dash 8-200s of Piedmont Airlines by the end of the year, uses active tuned vibration attenuators (ATVAs) attached to the fuselage, the Saab 340 version uses anti-noise loudspeakers in the cabin. The loudspeaker-based version is also installed in the Saab 2000, and is available as an option in the ATR 42.

Cambridge, UK-based Ultra is also exploring the corporate aircraft market and has developed a standard procedure for developing its technology for new aircraft types. Raytheon Aircraft is to install the loudspeaker-based system as standard in Beech King Air 350s this year and Bombardier is offering the ATVA-based system as an option in the Canadair Challenger business jet.

In the Challenger, ATVA "shakers" counteract tones from the rear-mounted engines, eliminating N1 (low spool) engine tone, says Ultra. Bombardier is said to be interested in offering UltraQuiet in its Global Express and Learjet business jets also.

Source: Flight International