Aircraft landing gear units 1.) Aircraft Wheels Made of Aluminum and Magnesium Alloys 2.) Aircraft Brakes with Carbon or Sintered Metal Brake Discs 3.) Test Rigs for Brake Systems 4.) Testing Equipment for Brake Materials 5.) Advanced Technologies in Design and Production of Brake Devices 6.) Brake System Units, Anti Skid Systems 7.) Aircraft Hydraulic Systems and Hydraulic Systems Units 8.) Integrated Drive Generators 9.) Hydraulic Pumps and Pumping Stations 10.) Hydraulic Drives 11.) Hydraulic Solenoid Operated Distribution Valves 12.) Safety Relaining Reducing Thermal and Switching Valves 13.) Test Rigs for aircraft hydraulic systems.