Systems and methods disclosed herein may be useful for aircraft heat shield assemblies. In this regard, a heat shield assembly is provided comprising a heat shield having an aperture, the aperture comprising an end portion and an insertion portion, the insertion portion having a width larger than the end portion, a spacer comprising an upper portion, an undermount flange and a gap between the upper portion and the undermount flange, wherein a surface of the gap is engaged with the heat shield, and wherein the undermount flange has a width less than the insertion portion of the aperture and greater than the width of the end portion.