Accession Number:

ADA460887

Title:

Insertion Loss of the HGU-56/P Aircrew Integrated Helmet System with Oregon Aero Earcup Replacement Products

Descriptive Note:

Final rept.

Corporate Author:

ARMY AEROMEDICAL RESEARCH LAB FORT RUCKER AL

Report Date:

2006-10-01

Pagination or Media Count:

143.0

Abstract:

The insertion loss of the HGU-56P Aircrew Integrated Helmet System AIHS configured with Oregon Aero replacement earcup products was evaluated in accordance with the American National Standard Microphone-in-Real-Ear and Acoustic Test Fixture Methods for the Measurement of Insertion Loss of Circumaural Hearing Protection Devices ANSI S12.42-1995 R1999, microphone-in-real-ear method. Insertion loss of the HGU-56P AIHS configured with the Oregon Aero HushKit replacement earcup foam was essentially equivalent to the helmets standard configuration. Employing the Oregon Aero SoftSeal replacement earcup seal with the HushKit foam yielded a small improvement in insertion loss over the standard helmet configuration. However, the Oregon Aero SoftSealHushKit Combo soft replacement earcups provided significantly poorer insertion loss than the standard earcup configuration. As with the Armys current flight helmetearcup combination, double protection i.e., earplugs in addition to the sound-protective flight helmet is required in certain high-noise environments.

Subject Categories:

  • Acoustics
  • Electricity and Magnetism
  • Protective Equipment

Distribution Statement:

APPROVED FOR PUBLIC RELEASE