A fault protected aircraft heated floor panel is provided. The pockets 21, 22, 23, 24 are arranged in two columns C1, C2 one on each longitudinal side of a central portion 20 of the contact zone 15 to form partial barriers to reduce the loss of oil from the central portion 20 during use of the piston 10. In transistor TR1 for low voltage drive, heavily doped region 15 is formed using only inner side wall insulating film 14 as the mask, and offset d1 is controlled. In addition, a method of making the thermoplastic laminate plank is further described which involves extruding at least one thermoplastic material into the shape of the core and affixing a laminate on the core, wherein the laminate comprises an overlay affixed to the top surface of the print layer and optionally an underlay layer affixed to the bottom surface of the print layer.