US Navy Pilot Helmet - Product Sound Project - Acentech U.S. Navy pilots have long expressed concerns about high noise levels in the Advanced Hawkeye E-2D aircraft. This long-range propeller plane generates strong tones at the propeller blade passage frequency near 147 Hz, and lower order harmonics up to around 600 Hz. Overall A-weighted noise levels of up to 105 dBA in the cockpit have led to missed radio communication, excessive post ?ight fatigue, as well as hearing loss for extended ?ight missions. The current helmet worn by Navy pilots ?ying this aircraft provides minimal reductions of cockpit noise levels in the frequency region of these tones. The Navy hired Acentech to determine why this is the case, and to propose solutions to increase the helmet’s performance. Acentech’s Phase I

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