A fan ramp for use in a thrust reverser portion of a nacelle of a gas turbine engine , the fan ramp extending circumferentially about an axial fan ramp centerline , the fan ramp defined by an annular torque box and comprising: a torque box forward bracket ; a fan ramp forward edge disposed, when installed, proximate an aft end of a fan case , the fan case at least partially surrounding a fan section of the gas turbine engine ; an fan ramp aft edge disposed, when installed, proximate a forward end of an array of cascades , the array of cascades being operable to permit a bypass airstream to pass therethrough during a thrust reversing operation; and a noise attenuating structure comprising a perforated layer , a base layer , and a core layer , all of which are stacked in a superimposed relationship so that the core layer is disposed between the perforated layer and the base layer ; wherein the perforated layer is configured to permit noise to pass therethrough, the core layer includes a substructure that is operable to receive an amount of the noise that passes through the perforated layer that is operable to reflect the amount of the noise off the base layer such that sound waves of reflected noise are out of phase with and destructively interfere with sound waves of noise outside the substructure ; and wherein the core layer comprises and axially extends between a forward axial end proximate the fan ramp forward edge and an aft axial end axially forward a blocker door forward edge, and the core layer is axially forward of the torque box forward bracket that forms the forward boundary of the torque box ; characterised in that the core layer is not disposed aft of the torque box forward bracket . a torque box forward bracket ; a fan ramp forward edge disposed, when installed, proximate an aft end of a fan case , the fan case at least partially surrounding a fan section of the gas turbine engine ; an fan ramp aft edge disposed, when installed, proximate a forward end of an array of cascades , the array of cascades being operable to permit a bypass airstream to pass therethrough during a thrust reversing operation; and a noise attenuating structure comprising a perforated layer , a base layer , and a core layer , all of which are stacked in a superimposed relationship so that the core layer is disposed between the perforated layer and the base layer ; wherein the perforated layer is configured to permit noise to pass therethrough, the core layer includes a substructure that is operable to receive an amount of the noise that passes through the perforated layer that is operable to reflect the amount of the noise off the base layer such that sound waves of reflected noise are out of phase with and destructively interfere with sound waves of noise outside the substructure ; and wherein the core layer comprises and axially extends between a forward axial end proximate the fan ramp forward edge and an aft axial end axially forward a blocker door forward edge, and the core layer is axially forward of the torque box forward bracket that forms the forward boundary of the torque box ; characterised in that the core layer is not disposed aft of the torque box forward bracket . <EOS>