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 (A) 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 (A) 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 . <EOS>