A gas turbine engine duct assembly comprising: a composite duct body including at least one rim; a flanged bracket including a radially extending portion defining a flange and an axially extending portion having an inner duct rim recess for accepting a portion of the at least one rim; and at least one attachment plate having an outer rim recess for accepting a portion of the at least one rim; characterised in that the at least one attachment plate having a projection recess for accepting a projection on the flanged bracket and the at least one attachment plate is axially offset from the radially extending portion;; a fastener opening extends through the projection recess and is aligned with a fastener opening in the projection, comprising a fastener extending through the fastener opening in the bracket recess and the fastener opening in the projection; the projection includes a first axially facing projection surface extending in a first plane perpendicular to a central longitudinal axis of the flanged bracket and a second axially facing projection surface extending in a second plane perpendicular to the central longitudinal axis of the flanged bracket; and the projection recess includes a first axially facing recess surface in abutting contact with the first axially facing projection surface and a second axially facing recess surface in abutting contact with the second axially facing projection surface, and optionally the projection includes a radially outward facing projection surface having a constant radial dimension between the first axially facing projection surface and the second axially facing projection surface. a composite duct body including at least one rim; a flanged bracket including a radially extending portion defining a flange and an axially extending portion having an inner duct rim recess for accepting a portion of the at least one rim; and at least one attachment plate having an outer rim recess for accepting a portion of the at least one rim; characterised in that the at least one attachment plate having a projection recess for accepting a projection on the flanged bracket and the at least one attachment plate is axially offset from the radially extending portion;; a fastener opening extends through the projection recess and is aligned with a fastener opening in the projection, comprising a fastener extending through the fastener opening in the bracket recess and the fastener opening in the projection; the projection includes a first axially facing projection surface extending in a first plane perpendicular to a central longitudinal axis of the flanged bracket and a second axially facing projection surface extending in a second plane perpendicular to the central longitudinal axis of the flanged bracket; and the projection recess includes a first axially facing recess surface in abutting contact with the first axially facing projection surface and a second axially facing recess surface in abutting contact with the second axially facing projection surface, and optionally the projection includes a radially outward facing projection surface having a constant radial dimension between the first axially facing projection surface and the second axially facing projection surface.