Accession Number : AD0716814

Title :   Acoustic Environments Produced by the C-5A Aircraft During Ground Operations.

Descriptive Note : Final rept. Sep 69-Apr 70,

Corporate Author : AIR FORCE AEROSPACE MEDICAL RESEARCH LAB WRIGHT-PATTERSON AFB OH

Personal Author(s) : Cole, John N. ; Powell, Robert G.

Report Date : OCT 1970

Pagination or Media Count : 113

Abstract : Sound pressure levels produced by the C-5A aircraft during ground runup at idle, taxi, and takeoff power settings were measured at locations 200 meters radially distant from the aircraft. These data were used to compute power spectra, directivity indices, and contours of equal sound pressure level, A-weighted overall sound level, permissible exposure time, speech interference level and perceived noise level (tone-corrected). These contours can be used to estimate these quantities over a maximum range from 125 to 1500 meters from the aircraft during ground operation for standard meteorological conditions. Measurements were also made at more than 40 locations where maintenance and ground crews must typically be located during normal operations. A-weighted and C-weighted overall sound levels and permissible exposure times were determined for personnel at these locations with and without ear protection. Preferred speech interference levels were also determined. (Author)

Descriptors :   *TAXIING), (*JET PLANE NOISE, (*JET TRANSPORT PLANES, JET PLANE NOISE), TAKEOFF, SPEECH, INTERFERENCE, AUDITORY PERCEPTION, EXPOSURE(PHYSIOLOGY).

Subject Categories : Acoustics

Distribution Statement : APPROVED FOR PUBLIC RELEASE