An internal duct of an aircraft engine pod may include a fan and a tubular air
intake having a first acoustic attenuation internal tubular piece. The first acoustic
attenuation internal tubular piece is acoustically homogeneous, is of the resonator
type, and has no internal assembly fish-plate. Additionally, the internal duct
may include a tubular fan casing and a tubular transition part for connecting the
air intake to the fan casing. An internal face of the tubular transition part is
acoustically homogeneous also. Moreover, the internal face of the first acoustic
attenuation internal tubular piece and the internal face of the tubular transition
part are disposed in aerodynamic continuity.