Fire seals system designed to be positioned in a corner of a region of attachment between a rear engine mount and a pylon of an aircraft comprising a thrust reverser cowl, the fire seals system comprising: - a metal shoe made with metal components and comprising: - a fitting comprising, on the one hand, an upstream first vane and a lateral first vane forming an L intended to be fixed in the corner, in which each first vane (268a-b) is intended to press against one of the flanks of the corner and, on the other hand, a lower second vane and an upper second vane in which the lower second vane extends at right angles to the first vanes (268a-b) and is attached to the lower edges thereof, and in which the upper second vane extends perpendicular to the first vanes (268a-b) and is attached to the upper edges thereof, and - a flexible tongue, in bowed shape and which has an upstream end intended to be fixed upstream of the fitting and a free downstream end intended to come to bear against an element of the attachment region that is offset towards the outside with respect to the upstream first vane, in which an intermediate part of the tongue, between the upstream end and the downstream end, is arranged between the lower second vane and the upper second vane, and - a longilinear seal designed to be attached to the thrust reverser cowl and of which one end comes to bear against the tongue. - a metal shoe made with metal components and comprising: - a fitting comprising, on the one hand, an upstream first vane and a lateral first vane forming an L intended to be fixed in the corner, in which each first vane (268a-b) is intended to press against one of the flanks of the corner and, on the other hand, a lower second vane and an upper second vane in which the lower second vane extends at right angles to the first vanes (268a-b) and is attached to the lower edges thereof, and in which the upper second vane extends perpendicular to the first vanes (268a-b) and is attached to the upper edges thereof, and - a flexible tongue, in bowed shape and which has an upstream end intended to be fixed upstream of the fitting and a free downstream end intended to come to bear against an element of the attachment region that is offset towards the outside with respect to the upstream first vane, in which an intermediate part of the tongue, between the upstream end and the downstream end, is arranged between the lower second vane and the upper second vane, and - a fitting comprising, on the one hand, an upstream first vane and a lateral first vane forming an L intended to be fixed in the corner, in which each first vane (268a-b) is intended to press against one of the flanks of the corner and, on the other hand, a lower second vane and an upper second vane in which the lower second vane extends at right angles to the first vanes (268a-b) and is attached to the lower edges thereof, and in which the upper second vane extends perpendicular to the first vanes (268a-b) and is attached to the upper edges thereof, and - a flexible tongue, in bowed shape and which has an upstream end intended to be fixed upstream of the fitting and a free downstream end intended to come to bear against an element of the attachment region that is offset towards the outside with respect to the upstream first vane, in which an intermediate part of the tongue, between the upstream end and the downstream end, is arranged between the lower second vane and the upper second vane, and - a longilinear seal designed to be attached to the thrust reverser cowl and of which one end comes to bear against the tongue.