FAA Volpe Labs is seeking feedback from the helicopter community regarding improvements to the methods and criteria used in capturing rotorcraft noise levels. The information gathered will be used to improve the existing civilian regulatory models. There is much more information on this program available online, here:
Feedback from the public needs to be received by May 28, 2015.
If you have additional questions, you can reach the following contact directly.
John A. Volpe National Transportation Systems Center