Noise Attenuation Performance of the Joint Service Aircrew Mask (JSAM) Type 1 (MPU-5) Rotor Wing (RW) with Flight Helmets
Interim rept. Sep 2009-Jan 2011
AIR FORCE RESEARCH LAB WRIGHT-PATTERSON AFB OH HUMAN PERFORMANCE WING (711TH) HUMAN EFFECTIVENESS DIRECTORATE/WARFIGHTER INTERFACE DIVISION
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Noise attenuation performance tests were performed on the Joint Service Aircrew Mask JSAM Type I MPU-5 Rotor Wing RW with the HGU-56P and HGU-84P helmets at the Air Force Research Laboratorys 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- 12.42-1995R2004 was used to measure the passive attenuation. Passive insertion loss was comparable for all systems in combination with HGU-56P. The AR-5 did outperform the MPU-5 across all frequencies when tested in combination with HGU-84P. In addition, the MPU-5 causes significant degradation of the helmet attenuation when comparing the helmet with and without the MPU-5.