Accession Number : ADA312045

Title :   Subjective Evaluation of the Communications Earplug with Flexible Harness (CEP/FH) Among CH-47D Crewmembers.

Descriptive Note : Final rept.,

Corporate Author : ARMY AEROMEDICAL RESEARCH LAB FORT RUCKER AL

Personal Author(s) : Ribera, John E. ; Mozo, Ben T. ; Murphy, Barbara A.

PDF Url : ADA312045

Report Date : JUL 1996

Pagination or Media Count : 18

Abstract : Noise levels in Army rotary-wing aircraft, particularly the CH-47D (Chinook), can reach as high as 115 dBA. Current aviator helmets provide adequate hearing protection. However, speech communication is less than optimum. The Communication Earplug with Flexible Harness (CEP/FH), developed at the United States Army Aeromedical Research Laboratory, may provide an answer to the problem. Seventeen aviators and crewmembers of a U.S. Army Reserve CH-47D unit field tested the CEP/FH and subsequently were queried. Results of the posttrial survey are presented and discussed. When compared with the standard issue SPH-4 series aviator helmet, crewmembers wearing the CEP/FH perceived improved speech clarity and reduced levels of noise. Based on weaknesses relative to the harness and microphone components of the CEP/FH, an advanced prototype of the CEP has evolved. It promises to be more compatible within the CH-47D environment, and more acceptable to crewmembers than the CEP/FH, while providing hearing protection and enhancing speech intelligibility in noise.

Descriptors :   *HELICOPTERS, *ROTARY WING AIRCRAFT, *HEARING, *FLIGHT HELMETS, *AIRCRAFT NOISE, *AVIATION MEDICINE, TEST AND EVALUATION, PILOTS, PROTOTYPES, CREWS, LEVEL(QUANTITY), PROTECTION, HARNESSES, SPEECH, ACOUSTIC ATTENUATION, NOISE REDUCTION, INTERCOMMUNICATION SYSTEMS, MICROPHONES, INTELLIGIBILITY, ARMY AIRCRAFT, VOICE COMMUNICATIONS, FLEXIBLE STRUCTURES.

Subject Categories : Helicopters
      Medicine and Medical Research
      Acoustics
      Noise Pollution and Control

Distribution Statement : APPROVED FOR PUBLIC RELEASE