Accession Number:



Joint Service Aircrew Mask (JSAM) - Tactical Aircraft (TA) A/P22P-14A Respirator Assembly (V)5: Speech Intelligibility Performance with Double Hearing Protection, HGU-84/P Flight Helmet

Descriptive Note:

Technical Report,01 Dec 2016,31 Jan 2017

Corporate Author:

711 Human Performance Wing Wright-Patterson AFB United States

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Speech intelligibility measurements were conducted in accordance with American National Standards Institute ANSI S3.2-2009 Method for Measuring the Intelligibility of Speech over Communication Systems on the Joint Service Aircrew Mask Tactical Aircraft JSAM-TA AP22P-14A Respirator Assembly V5 with the HGU-84P flight helmet in combination with Communications Earplug CEP and 3M EAR Classic trademark 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 JSAM-TA Respirator Assembly V5, when worn with the HGU-84P and both CEP and EAR Classic trademark, met the speech intelligibility requirement greater than or equal to 80 percent for low-noise environments, when using a torso-mounted Intercommunications Unit ICU V5, with scores of 93.0 percent and 88.5 percent, respectively. In high-noise environments, when hardwired via torso-mounted Communications Control Unit CCU, speech intelligibility requirements were met for CEP with a score for 96.3 percent at 115 decibels dB and for EAR Classic trademark with a score of 88.9 percent at 105 dB.

Subject Categories:

  • Protective Equipment

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