An auxiliary power unit intake duct for an aircraft, comprising an
internal straight portion 1a, an internal first bend portion 1b and an
internal second bend portion 1c, extending between an air inlet 2 and a
plenum entry 3 of the auxiliary power unit, a plurality of acoustic
guides vanes 4,5 located in the straight portion 1a of the intake duct 1,
extending horizontally between opposite side portions of the straight
portion 1a; and a plurality of curved aerodynamic guide vanes 6,7 located
in the second bend portion 1c proximate to said plenum inlet 3, extending
vertically between a top portion and a bottom portion of the second bend
portion 1c, each of the curved aerodynamic guide vanes 6,7 being
concentric with said bend curvature of the second bend portion 1c.