An assembly for an aircraft propulsion system, comprising: a thrust reverser system including a sleeve and a blocker door; the sleeve configured to translate in an aft direction along a centerline from a sleeve stowed position to a sleeve deployed position; the blocker door configured to move between a blocker door stowed position and a blocker door deployed position, the blocker door disposed within a cavity of the sleeve when the sleeve is in the sleeve stowed position and the blocker door is in the blocker door stowed position, and the blocker door projecting in a radial inward direction away from the sleeve towards the centerline when the sleeve is in the sleeve deployed position and the blocker door is in the blocker door deployed position; and the blocker door comprising a pivot attachment fixed at an end of the blocker door, the pivot attachment configured to move in a forward direction from a first location to a second location, wherein the thrust reverser system includes a fixed cascade structure disposed within the cavity of the sleeve when the sleeve is in the sleeve stowed position; characterised in that the assembly comprises: a fixed structure (90; 91), wherein the fixed structure (90; 91) comprises a frame track (136A; 136B); and a frame extending circumferentially about the centerline to a frame side (130; 132), the frame comprising a frame slider (134A; 134B) at the frame side (130; 132), and the frame slider (134A; 134B) configured to translate along the frame track (136A; 136B) as the blocker door moves towards and away from the blocker door deployed position; and the pivot attachment pivotally attaches the blocker door to the frame. a thrust reverser system including a sleeve and a blocker door; the sleeve configured to translate in an aft direction along a centerline from a sleeve stowed position to a sleeve deployed position; the blocker door configured to move between a blocker door stowed position and a blocker door deployed position, the blocker door disposed within a cavity of the sleeve when the sleeve is in the sleeve stowed position and the blocker door is in the blocker door stowed position, and the blocker door projecting in a radial inward direction away from the sleeve towards the centerline when the sleeve is in the sleeve deployed position and the blocker door is in the blocker door deployed position; and the blocker door comprising a pivot attachment fixed at an end of the blocker door, the pivot attachment configured to move in a forward direction from a first location to a second location, wherein the thrust reverser system includes a fixed cascade structure disposed within the cavity of the sleeve when the sleeve is in the sleeve stowed position; characterised in that the assembly comprises: a fixed structure (90; 91), wherein the fixed structure (90; 91) comprises a frame track (136A; 136B); and a frame extending circumferentially about the centerline to a frame side (130; 132), the frame comprising a frame slider (134A; 134B) at the frame side (130; 132), and the frame slider (134A; 134B) configured to translate along the frame track (136A; 136B) as the blocker door moves towards and away from the blocker door deployed position; and a fixed structure (90; 91), wherein the fixed structure (90; 91) comprises a frame track (136A; 136B); and a frame extending circumferentially about the centerline to a frame side (130; 132), the frame comprising a frame slider (134A; 134B) at the frame side (130; 132), and the frame slider (134A; 134B) configured to translate along the frame track (136A; 136B) as the blocker door moves towards and away from the blocker door deployed position; and the pivot attachment pivotally attaches the blocker door to the frame.