Airport noise can be an emotionally volatile issue in municipal politics. However, Robert Grotell thinks data, not emotion, should drive decisions about airport and air route noise abatement.
The system for monitoring aircraft noise at Boston Logan International Airport and Hanscom Field is being upgraded to provide near real-time flight-tracking data on the web to the public so they can use the technology to report aircraft noise complaints online. The system consists of 36 field monitors–30 in the communities around Logan Airport and six around Hanscom Field.
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.
Sennheiser’s updated active noise cancellation HMEC 26-2 headset adds comfort, noise protection and a higher sound pressure level to the HMEC 26. To improve the fit for a wider variety of pilots, Sennheiser redesigned the two-piece automatic headband so it can be opened another 20 degrees. Restricting folding of the ear cups to a 45-degree angle improves wearing stability. The microphone boom is made of a new steel that remains in the set position more securely, according to Sennheiser.
Butler National is nearing completion of an STC for a Learjet 20-series Stage 3 noise suppression device. The aircraft is subject to the FAA Modernization and Reform Act of 2012, which includes provisions that ban its operation in the U.S. after Dec. 31, 2015 for not meeting current FAA Stage 3 noise level requirements. Installation of the Avcon Noise Suppressor should allow continued use of the airplanes in 2016 and beyond.Butler projects installations of the Avcon Noise Suppressor STC will begin this fall.
Avcon is “nearing completion” of its STC project for a Learjet 20-series Stage 3 noise suppression device. Under the FAA Modernization and Reform Act of 2012, aircraft that do not meet Stage 3 noise level requirements–a category that includes unmodified 20-series Learjets–cannot be operated in the U.S. after Dec. 31, 2015. Installation of the Avcon noise suppressor on 20-series Learjets should allow continued use of the CJ610 turbojet-powered airplanes beyond that date, the company said. Installations of the STC’d suppressors are expected to begin in the fall.
Today at EBACE, Nextant Aerospace launched the $4.95 million 400XTi (the “i” stands for innovation) as the latest evolution of its remanufactured Beechjet. Compared to the 400XT, the new version introduces a number of improvements, including an all-new cabin that offers more space and reduced noise.
Researchers at the German Aerospace Center (DLR), working at Turbomeca’s test facilities in Bordes, France, have managed to measure the noise inside a helicopter engine. They used new hot-gas microphone probes in an environment of high pressure (up to 12 bar) and high temperature (up to 1,200 degrees C). The microphones were installed at various places inside the engine and around the exhaust. Their signals were recorded simultaneously. Analysis of the noise field enabled the DLR to explain how noise is generated and how sound propagates.
Aerocon Engineering has signed a contract with an undisclosed customer to design a cabin noise-reduction system for a head-of-state 747-8i.
According to CEO Benny Younesi, the Van Nuys, Calif.-based company’s latest system upgrade will be “lighter, more efficient, more cost effective and easier to maintain.” The company intends to seek STC approval from both EASA and the FAA.
The FAA’s final rule on civil tiltrotor noise limits and conditions for noise compliance measurement becomes effective March 11. It amends regulations governing noise certification standards and establishes new noise limits and procedures to ensure that noise-reduction technology is incorporated in tiltrotors.
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