Gulfstream is now delivering the G200 standard with a thermal/acoustic interior, which is said to reduce both aircraft weight and cabin noise levels. The weight saving is at least 150 lb, according to Gulfstream. Acoustical testing is planned for later this month and measured noise is expected to be about 55 dB on the speech-interference-level scale.
E-A-R Specialty Composites (Booth No. 331) has broken ground for a new 11,500-sq-ft acoustic test center designed to increase the Indianapolis company’s test and analysis capabilities.
Three companies have expressed serious interest in developing a supersonic business jet (SSBJ), but none of the designs proposed by Aerion, Sukhoi or Supersonic Aerospace International has reached the launch stage, making it unlikely that any will emerge as a flying prototype anytime soon.
The prototype personal stereo was famously developed in 1978 to help Sony founder Masaru Ibuka listen to opera while airborne on business trips.
Manufacturers of newly designed helicopters will have to meet slightly revised U.S. noise standards, effective with applications for new designs or major design changes submitted after June 1. The FAA revised FAR Part 36 to harmonize helicopter noise standards with those of the JAA and ICAO.
Gulfstream Aerospace hosted a NASA F-15 in Savannah, Ga., on February 14 for an aerial demonstration of its Quite Spike telescopic nose spike installation. If Gulfstream were ever to decide to launch a supersonic business jet, it would have to employ some means of suppressing the sonic boom while flying over land.
Business aircraft crews and passengers are generally aware of the danger of prolonged exposure to noise in terms of hearing loss. Now there is a growing body of evidence that prolonged exposure to a combination of high-intensity and low-frequency noise may pose far more serious health threats.
It’s probable that a bent-down microphone jack receptacle–a non-OEM installation–found near the base of the copilot’s control column prevented aft movement of the yoke, causing a Challenger 600 to overrun the runway during takeoff from Tupelo Regional Airport, Miss., on March 9, according to a Bombardier Advisory Wire sent to operators of 600-series Challengers.
The FAA is concerned that some noise-canceling headsets might prevent pilots from hearing audible alarms, abnormal engine noise or other mechanical sounds. The agency, in a January 1 Information for Operators (InFO 07001), said noise attenuation of headsets “may vary by make and model” and if these sounds cannot be detected “discontinue the use of noise-canceling headsets.”
All jet and transport-category airplanes (those with an mtow of 12,500 pounds or more) for which application of a new type design is submitted on or after January 1 this year have to meet new noise certification levels. Stage 4 is a cumulative 10 EPNdB (effective perceived noise level in decibels) less than Stage 3 limits. Virtually all in-production business jets will qualify to be recertified under Stage 4.