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Headlines and Top Story- Updated August 17, 2018

East Hampton Airport Sees Increased Traffic Since Court Blocked Curfews 
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- Helicopter Groups Voice Support for FAA Noise Complaint Hotline
- Stakeholders Agree on First Steps to Reduce Helicopter Noise Over NYC
- Howard County Seeks Relief from BWI Noise
- ACRP to Sponsor Study on Designing NextGen Flight Paths to Reduce Noise
- FAA Awards AIP Grants to Fund Airport Noise Projects
- Special Report: Guide to Airport Noise Programs
- ACRP Issues Guide for Noise Modeling of Commercial Space Operations
- NASA and Uber Partner to Explore Urban Air Mobility Safety and Noise
- DC-Area Residents Lose Legal Battle Over Noise Around Reagan National Airport

NASA Claims 70 Percent Reduction in Airframe Noise

In a series of test flights that concluded in May, NASA engineers successfully demonstrated three new technologies the agency says can reduce airframe noise on landing by more than 70 percent. Under the Acoustic Research Measurement (ARM) program, they conducted tests on airframe components of a Gulfstream III research aircraft, flying at an altitude of 350 feet past a 185-sensor microphone array at Edwards Air Force Base in California

“NASA tested several experimental designs…including landing gear fairings and cavity treatments designed and developed at Langley [Research Center], as well as the Adaptive Compliant Trailing Edge (ACTE) wing flap, which had previously been flight-tested to study aerodynamic effi-ciency,” according to an agency spokesperson.

“While porous concepts for landing gear fairings have been studied before, NASA’s design was based on extensive computer simulations to produce the maximum amount of noise reduction without the penalty of increasing aerodynamic drag. The landing gear cavity was treated with a series of chevrons near its leading edge, and a net stretched across the opening to alter airflow, aligning it more with the wing.”

The ACTE wing flap, built by FlexSys Inc. of Ann Arbor, Mich., is a seamless design that eliminates gaps between the flap and the main body of the wing. “This airframe noise reduction produced by NASA technology is definitely momentous, and the best part is that it directly benefits the public,” said ARM project manager Kevin Weinert. 

“While there are obvious potential economic gains for the industry, this benefits the people who live near major airports, and have to deal with the noise of aircraft coming in to land. This could greatly reduce the noise impact on these communities.”

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