NASA’s Noise Reduction Technology Reduces Aircraft Noise by More Than 70 Percent
NASA successfully combined several technologies including Landing Gear NR, landing gear cavity treatments, and the Adaptive Compliant Trailing Edge flexible wing flap, on various airframe components of a Gulfstream III research aircraft to achieve a greater than 70 percent reduction in airframe noise.
The Landing Gear NR technology element addressed airframe noise caused by airflow moving past the landing gear on approach. Another area of focus was landing gear cavities, also a known cause of airframe noise. These are the regions where the landing gear deploys from the main body of an aircraft, typically leaving a large cavity where airflow can get pulled in, creating noise.