Assessment of HGU-56/P Aircrew Integrated Helmet System (AIHS) Blunt Impact Protection after Liner Modifications
ARMY AEROMEDICAL RESEARCH LAB FORT RUCKER AL FORT RUCKER United States
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The U.S. Armys HGU-56P AIHS performance standard was developed after a series of reviews of U.S. Army rotary-wing mishaps showed that aircrew lives were being lost to head injury in otherwise survivable accidents. Such cases included basilar skull fractures from both lateral and crown impacts, other skull fractures, intracranial hemorrhage, and concussions. The standard requires a helmet to be impacted at 4.9 mps for crown impacts and 6.0 mps for all other impact sites. Pass-fail headform acceleration thresholds of 150Gfor crown and lateral impacts and 175G for impacts to all other regions of the helmet. Particular attention is paid to lateral impact performance to minimize the risk of basilar skull fracture, which was prevalent with older helmet designs. Currently, the HGU-56PAIHS, initially fielded in 1995, and its variants, the HGU-56P Apache Aircrew Integrated Helmet AAIH and the HGU-56P RWH, are the only helmets to meet the AIHS performance standard. The HGU-56P AIHS is currently in service with the U.S. Army, Air Force, Marine Corps, and Coast Guard. The HGU-56P AAIH is a platform specific variant of the HGU-56P AIHS and is worn by pilots of the AH-64E. The HGU-56P RWH is incrementally replacing the HGU-56P AIHS in the U.S. Army.
- Protective Equipment