Aircraft Noise Definition.
BOEING COMMERCIAL AIRPLANE CO SEATTLE WASH
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Acoustic data acquisition and reduction systems are discussed together with analytical procedures used to derive noise characteristics of a series of Boeing aircraft types. Noise data are presented in EPNdB and dBA units, from takeoff to low approach thrust and for aircraft altitudes from 200 to 12,000 feet. Areas of possible data deficiency are identified and 90 confidence limits established where possible. A flight test program is proposed with the objectives of improving data accuracy and establishing confidence limits over a wide range of operating conditions.
- Civil Engineering