Accession Number : ADA191938

Title :   First Article Noise Survey of the A/F32T-9 Large Turbo Fan Engine Enclosed Noise Suppressor System, Far-Field Noise, Ellsworth AFB, South Dakota.

Descriptive Note : Final rept. for period ending 13 Oct 87,

Corporate Author : AIR FORCE OCCUPATIONAL AND ENVIRONMENTAL HEALTH LAB BROOKS AFB TX

Personal Author(s) : Ali, Ali Y

PDF Url : ADA191938

Report Date : Feb 1988

Pagination or Media Count : 274

Abstract : The A/F32T-9 Large Turbo Fan Engine, Enclosed Noise Suppressor System (T-9 NSS) at Ellsworth AFB SD was surveyed to determine noise levels at 100 meters (m). With an F101 engine operating at afterburner power the highest measured Overall Sound Level, A-Weighted (OASLA) was 78.4 dB(A). The measured OASLA values exceeded the 77 dB(A) criterion at only 7 of the 18 sampling positions at a range from 0.3 to 1.4 dB(A).

Descriptors :   *NOISE REDUCTION, *TURBOFAN ENGINES, AFTERBURNERS, FAR FIELD, LEVEL(QUANTITY), POWER, SOUND, SOUTH DAKOTA, SURVEYS

Subject Categories : Jet and Gas Turbine Engines
      Noise Pollution and Control

Distribution Statement : APPROVED FOR PUBLIC RELEASE