A fan section of a gas turbine engine comprising: a fan inlet case comprising fluid passages configured to fluidly receive heated fluid from at least one of a compressor section and a combustor section; and a fan bearing assembly coupled to the fan inlet case, characterised in that the fan section comprises an annular heatshield mounted to the fan inlet case, wherein the annular heatshield is configured to reduce convective heat transfer from the heated fluid to the fan bearing assembly, wherein the fan bearing assembly comprises a bearing and a bearing support engaged about the bearing, wherein the annular heatshield is configured to reduce convective heat transfer from the heated fluid to the bearing support, wherein: the annular heatshield is substantially parallel with the engine central longitudinal axis; the annular heatshield and a radially inward surface of the fan inlet case form a plenum chamber for the heated fluid; the annular heatshield is radially outward relative to and spaced a radial distance apart from a radially outward surface of the bearing support that is parallel to the central rotational axis of the fan; wherein an aft edge of the annular heatshield contours features of at least one of the bearing support and the fan inlet case to facilitate substantial fluid isolation of the plenum chamber from the radially outward surface of the bearing support, and wherein the annular heatshield comprises a flange at a forward edge of the annular heatshield for mounting the annular heatshield to the fan inlet case. a fan inlet case comprising fluid passages configured to fluidly receive heated fluid from at least one of a compressor section and a combustor section; and a fan bearing assembly coupled to the fan inlet case, characterised in that the fan section comprises an annular heatshield mounted to the fan inlet case, wherein the annular heatshield is configured to reduce convective heat transfer from the heated fluid to the fan bearing assembly, wherein the fan bearing assembly comprises a bearing and a bearing support engaged about the bearing, wherein the annular heatshield is configured to reduce convective heat transfer from the heated fluid to the bearing support, wherein: the annular heatshield is substantially parallel with the engine central longitudinal axis; the annular heatshield and a radially inward surface of the fan inlet case form a plenum chamber for the heated fluid; the annular heatshield is radially outward relative to and spaced a radial distance apart from a radially outward surface of the bearing support that is parallel to the central rotational axis of the fan; wherein an aft edge of the annular heatshield contours features of at least one of the bearing support and the fan inlet case to facilitate substantial fluid isolation of the plenum chamber from the radially outward surface of the bearing support, and wherein the annular heatshield comprises a flange at a forward edge of the annular heatshield for mounting the annular heatshield to the fan inlet case. the annular heatshield is substantially parallel with the engine central longitudinal axis; the annular heatshield and a radially inward surface of the fan inlet case form a plenum chamber for the heated fluid; the annular heatshield is radially outward relative to and spaced a radial distance apart from a radially outward surface of the bearing support that is parallel to the central rotational axis of the fan; wherein an aft edge of the annular heatshield contours features of at least one of the bearing support and the fan inlet case to facilitate substantial fluid isolation of the plenum chamber from the radially outward surface of the bearing support, and wherein the annular heatshield comprises a flange at a forward edge of the annular heatshield for mounting the annular heatshield to the fan inlet case.