Accession Number : AD0719746

Title :   Measurement and Analysis of C-5A Interior Acoustic Environments During Flight Operations.

Descriptive Note : Final rept. Jul-Aug 70,

Corporate Author : AEROSPACE MEDICAL RESEARCH LAB WRIGHT-PATTERSON AFB OHIO

Personal Author(s) : Rose,Justus F. , Jr

Report Date : OCT 1970

Pagination or Media Count : 68

Abstract : Interior sound pressure levels produced by the C-5A aircraft were measured at sixty-six locations where crew/passenger personnel9would typically be located during operational missions. Conditions ranged from aircraft preflight through maximum endurance cruise at an altitude of 31,000 feet. These data were used to compute A-weighted and C-weighted overall sound levels, permissible exposure times with and without ear protection and preferred speech interference levels. The measured data were grouped by location/condition and each major compartment in the aircraft evaluated for human exposure to the environment. The major problem area is in the cargo compartment where the high noise levels are such that for any appreciable exposure time, ear protection must be worn to prevent risk of permanent hearing impairment. The public address system in the cargo compartment is inadeuate as presently configured and coupled with the high noise levels cannot be effectively used to brief passengers during missions. (Author)

Descriptors :   (*JET PLANE NOISE, *AIRCRAFT CABINS), (*AVIATION MEDICINE, *PSYCHOACOUSTICS), HEARING, EAR PROTECTORS, VOICE COMMUNICATIONS, FLIGHT, AUDITORY PERCEPTION, JET TRANSPORT PLANES

Subject Categories : Stress Physiology
      Acoustics

Distribution Statement : APPROVED FOR PUBLIC RELEASE