Air inlet duct for a nacelle of an aircraft propulsion assembly

An air inlet duct for a nacelle of an aircraft propulsion assembly, said duct comprising an annular body and an annular air inlet lip comprising two coaxial annular walls, respectively inner and outer, the inner wall defining a portion of an inner annular surface of the air inlet duct and the outer wall defining a portion of an outer annular surface of the air inlet duct, the air inlet duct further comprising a control system configured to move the lip in axial translation relative to said body, from a first position in which the lip is joined to said body to a second position in which the lip is axially spaced apart from said body, the duct further comprising an annular row of grilles secured in translation with the lip and which are configured to be, in said first position, housed in said body, and, in said second position, extended from said body positioned to be traversed by an airflow entering the air inlet duct, wherein the duct further comprises at least one guiding system of the lip in translation with respect to said body, which is of a rail and slide type.