Noise Attenuation Performance of the Joint Service Aircrew Mask

http://www.dtic.mil/dtic/tr/fulltext/u2/a550649.pdf


AFRL-RH-WP-TP-2011-0028

Noise Attenuation Performance of the Joint
Service Aircrew Mask (JSAM) Type I (MPU-5) Rotor Wing (RW) with Flight
Helmets
Hilary L. Gallagher
Richard L. McKinley
Warfighter Interface Division
JANUARY 2011



Noise attenuation performance tests were performed on the Joint Service Aircrew Mask (JSAM) Type I (MPU-5) Rotor Wing (RW) with the HGU-56/P and HGU-84/P helmets at the Air Force Research Laboratory’s (AFRL) Acoustics facilities at Wright-Patterson Air Force Base September 2009. The MPU-5 was tested and compared to legacy masks (M-45, AERP, and AR-5). An American National Standards Institute (ANSI) method ANSI S- 12.42-1995(R2004) was used to measure the passive attenuation. Passive insertion loss was comparable for all
systems in combination with HGU-56/P. The AR-5 did outperform the MPU-5 across all frequencies when tested in combination with HGU-84/P. In addition, the MPU-5 causes significant degradation of the helmet attenuation when comparing the helmet with and without the MPU-5.