An air modulating system for a gas turbine engine, the air modulating system comprising: a fixed plate comprising a fluid passage inlet; a floating plate with a first side, wherein the first side is adjacent to the fluid passage inlet; an actuated mount selectively rotatable circumferentially about an axis and configured to move the floating plate relative to the fixed plate; and a linkage element for connecting the floating plate to the actuated mount, wherein: the linkage element comprises a mounting flange configured to slidably engage the floating plate, characterised in that the floating plate further comprises a receptacle configured to slidably receive the linkage element, wherein the receptacle is substantially the same cross-sectional shape as the linkage element, such that the mounting flange is radially retained by the receptacle, but larger than the cross-sectional shape of the linkage element to permit the floating plate to translate axially relative to the actuated mount, and when the actuated mount is rotated in a first direction, the floating plate is moved about an inner circumference of the actuated mount to cover the fluid passage inlet, and when the actuated mount is rotated in a second opposite direction, the floating plate is moved to uncover the fluid passage inlet. a fixed plate comprising a fluid passage inlet; a floating plate with a first side, wherein the first side is adjacent to the fluid passage inlet; an actuated mount selectively rotatable circumferentially about an axis and configured to move the floating plate relative to the fixed plate; and a linkage element for connecting the floating plate to the actuated mount, wherein: the linkage element comprises a mounting flange configured to slidably engage the floating plate, characterised in that the floating plate further comprises a receptacle configured to slidably receive the linkage element, wherein the receptacle is substantially the same cross-sectional shape as the linkage element, such that the mounting flange is radially retained by the receptacle, but larger than the cross-sectional shape of the linkage element to permit the floating plate to translate axially relative to the actuated mount, and when the actuated mount is rotated in a first direction, the floating plate is moved about an inner circumference of the actuated mount to cover the fluid passage inlet, and when the actuated mount is rotated in a second opposite direction, the floating plate is moved to uncover the fluid passage inlet. the linkage element comprises a mounting flange configured to slidably engage the floating plate, characterised in that the floating plate further comprises a receptacle configured to slidably receive the linkage element, wherein the receptacle is substantially the same cross-sectional shape as the linkage element, such that the mounting flange is radially retained by the receptacle, but larger than the cross-sectional shape of the linkage element to permit the floating plate to translate axially relative to the actuated mount, and when the actuated mount is rotated in a first direction, the floating plate is moved about an inner circumference of the actuated mount to cover the fluid passage inlet, and when the actuated mount is rotated in a second opposite direction, the floating plate is moved to uncover the fluid passage inlet.