A sound survey was conducted in a modified CF5D aircraft to determine the effectiveness of prototype floor and torso-valve mufflers in reducing the noise produced by the cockpit air conditioner. The noise levels in the rear cockpit of a modified aircraft were about 6, 10 and 12 dBA less, for air-conditioner settings 'full cold', '60 F', and 'full hot respectively, than in an unmodified aircraft flown under identical conditions. (Author)
Cf5d Aircraft Cockpit-Noise Reduction
1974
39 pages
Report
Keine Angabe
Englisch
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