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Zandbergen, T. (author), Sarin, S.L. (author), Laan, J.N. (author), Zeemans, H.J. (author)Acoustic measurements were carried out in the engine intake ducts of a Fokker F28 aircraft during flight. One of the two tail-mounted, low by-pass ratio engines having a hard-walled intake was instrumented to determine the amplitudes of the circumferential modes which constitute the sound field. In the other engine the impedance of the inlet...report 1983