Operational Test to Evaluate the Effectiveness of the Communication Earplug and Active Noise Reduction Devices when used with the HGU-56P Aviator Helmet
ARMY AEROMEDICAL RESEARCH LAB FORT RUCKER AL
Pagination or Media Count:
Thirty-nine aviatorscrew members participated in an operational evaluation of the HGU-56P aviation helmet equipped with three different active noise reduction ANR systems and the communication earplug CEP in routine daily aviation mission environments. Results of weekly and posttrial comprehensive surveys are discussed. The operational assessment found that both CEP and ANR systems reduce noise exposure levels at the wearers ear and improve speech intelligibility SI characteristics of the HGU-56P helmet system. Intercommunication system volume controls are reduced significantly from levels normally used with the standard helmet. Effects on sound attenuation and SI when wearing spectacles with ANR and standard helmet are minimal. The chemical biological mask wearing causes significant reduction in helmet system performance for standard and ANR configurations with ear seal compromise. No effect was observed for the combination protection or the CEP. ANR systems do not show any positive effect in reducing impulse noise levels from weapon muzzles encountered in Army aviation noise environments. A system fielding decision will require noting effects of helmet weight, ancillary devices, safety, performance, user acceptance and cost. Subject preference choice was the CEP.
- Radio Communications
- Human Factors Engineering and Man Machine Systems