APS brake discs are state-of-the-art CNC machined from a one-piece forging. When the metal is forged it creates a directional grain flow that follows the contour of the disc. This allows for a much stronger disc that has a reduced risk of the cracking and catastrophic failures associated with the inferior welded design.Our proprietary heat treatment has a two-fold purpose. The heat treatment strengthens the steel by bonding the carbon, oxygen and nitrogen in the top layer of the metal. This is not a coating that can wear off. The steel itself is transformed. The heat treatment gives the steel its aesthetically pleasing black appearance and provides a surface with a high resistance to the corrosion and oxidation associated with the extreme thermal cycling experienced in aircraft braking systems. This makes it an excellent choice for agricultural aircraft that work in a harsh, chemical environment, as well as anyone who leaves their plane outside for most of its life.APS Brakes are PMA parts which are manufacturer to meet or exceed the same standards that OEM parts must meet to receive FAA approval PMA parts are often much higher quality and of more ingenious design than the parts that they replace. As a general rule, these parts are also less expensive because they are usually presented to market by a smaller company with less overhead. When installing APS brake parts (FAA - PMA parts), no special instructions are required for continued airworthiness, or for installation and operation. APS parts can be maintained and inspected in accordance with current OEM publications for continued airworthiness.