Operational Test to Evaluate the Effectiveness of the Communication Earplug and Active Noise Reduction Devices when used with the HGU-56P Aviator Helmet
Abstract
Thirty-nine aviators/crew members participated in an operational evaluation of the HGU-56/P 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 wearer's ear and improve speech intelligibility (SI) characteristics of the HGU-56/P 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.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 01, 1997
- Accession Number
- ADB220453
Entities
People
- Barbara A. Murphy
- Ben T. Mozo
- Robert N. Staton
Organizations
- United States Army Aeromedical Research Lab