Joint Service Aircrew Mask (JSAM) - Tactical Aircraft (TA) A/P22P-14A Respirator Assembly (V)3: Noise Attenuation and Speech Intelligibility Performance with Double Hearing Protection, HGU-68/P Flight Helmet
Technical Report,01 Sep 2016,01 Dec 2016
AIR FORCE RESEARCH LAB WRIGHT-PATTERSON AFB OH HUMAN PERFORMANCE WING (711TH) WRIGHT-PATTERSON AFB United States
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Noise attenuation and speech intelligibility measurements were conducted in accordance with American National Standards Institute ANSI S12.6-1997 Methods for Measuring the Real-Ear Attenuation of Hearing Protectors and ANSI S3.2-2009Method for Measuring the Intelligibility of Speech over Communication Systems on the Joint Service Aircrew MaskTactical Aircraft JSAM-TA AP22P-14A Respirator Assembly V3 with the HGU-68P flight helmet in combination with Communications Earplug CEP and 3M EAR Classic foam earplugs. The objective of these measurements was to determine if the JSAM-TA performance requirements were met when double hearing protection was used. The addition of the JSAM-TA Respirator Assembly V3 to both helmetearplug configurations, HGU-68P with CEP and HGU-68P with EAR Classic, met noise attenuation requirements across all frequencies, ranging from 125 to 8000 hertz Hz. Additionally, JSAM-TA configurations with the HGU-68P and both CEP and EAR Classic met the speech intelligibility requirement 80 for low-noise environments, when using a torso-mounted Intercommunications Unit ICU, with scores of 85.3 and 83.0, respectively. In high-noise environments, when hardwired into an aircraft communication system, speech intelligibility requirements with CEP configurations were met with a score of 85.4 at 115 decibels dB. High-noise speech intelligibility requirements were not met for the EAR Classic configuration, with a score of 76.7 at 95 dB.
- Protective Equipment
- Military Aircraft Operations