Impact Protection Assessment of the Redesigned Oregon Aero ZetaLiner Fitting System in the HGU-56/P Aircrew Integrated Helmet System
ARMY AEROMEDICAL RESEARCH LAB FORT RUCKER AL
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The HGU-56P Aircrew Integrated Helmet System AIHS uses the thermoplastic liner TPL to provide wearers with a custom helmet fit. While the TPL provides a comfortable helmet fit for most HGU-56P AIHS wearers, there is a portion of the aviation warfighter population who cannot be comfortably accommodated by the TPL. Oregon Aero, Inc. markets an alternative helmet fitting system for the HGU-56P AIRS this fitting system is referred to as the Zetal throughout the manuscript. The impact of replacing the TPL with the Zetall fitting system on the blunt impact protection provided by the HGU-56P AIHS is unknown. Fifty two 52 new HGU-56P AIHSs in four sizes small, medium, large, and extra-large were subjected by blunt impact evaluations in accordance with the HGU-56P purchase description. The TPL in each helmet was replaced with a 14-inch thick Zetall fitting system. Peak head accelerations measured during these trials were compared to peak head acceleration limits. Listed in the HGU-56P AIHS purchase description peak head accelerations exceeding the limits set forth in the purchase description represented reduced blunt impact protection. Peak head accelerations measured during this evaluation remained below these specified limits, indicating that the impact protection of the HGU-56P AIHS is not degraded with the use of the Zetall fitting system.
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