Accession Number : ADA322052

Title :   Assessment of Noise Levels in and Around the Sikorsky S-7OA-9 Black Hawk Helicopter.

Descriptive Note : Technical rept.,

Corporate Author : DEFENCE SCIENCE AND TECHNOLOGY ORGANIZATION CANBERRA (AUSTRALIA)

Personal Author(s) : King, R. B. ; Saliba, A. J. ; Creed, D. C. ; Brock, J. R.

PDF Url : ADA322052

Report Date : FEB 1996

Pagination or Media Count : 61

Abstract : This document reports the results of a comprehensive noise survey of the Sikorsky S-7OA-9 Black Hawk helicopter environment and provides an assessment of the hearing protection devices worn by personnel exposed to this environment. Ambient noise levels were measured in the cabin of the Black Hawk at four positions under various flight conditions and at thirteen positions outside the Black Hawk under various ground running conditions. The attenuation properties of the ALPHA helmet, the Roanwell MX-25O7 Communications Headset and the EAR earplug were also assessed. Results show that these devices do not always provide enough hearing protection to meet current conservation regulations (DIG PERS 19-4), even when worn in combination. Recommendations relating to the use of these hearing protection devices and the maximum Permissible Daily Exposure Duration (PDED) for personnel exposed to the Black Hawk environment are made.

Descriptors :   *HELICOPTERS, *ACOUSTIC ATTENUATION, *AMBIENT NOISE, *EAR PROTECTORS, NOISE REDUCTION, EXPOSURE(PHYSIOLOGY), FLIGHT MANEUVERS, AUSTRALIA, HEARING, FLIGHT HELMETS, AIRCRAFT NOISE, AIRCRAFT ENGINE NOISE, AIRCRAFT CABINS, PROPELLER NOISE.

Subject Categories : Helicopters
      Noise Pollution and Control
      Protective Equipment

Distribution Statement : APPROVED FOR PUBLIC RELEASE