Operational for more than 50 years, MD Helicopters specializes in the design and manufacture of advanced technology aircraft. The company is a part of Patriarch Partners, which is a private equity firm. It has supplied a fleet of more than 2,500 helicopters worldwide. MD Helicopters s clients list includes several national, regional and international police, armed and special operation forces. The company s product line includes the MD 500E, MD 530F, MD 520N, MD 600N and MD Explorer models. It also offers an annual maintenance program for customers. MD Helicopters aircraft utilizes the NOTAR anti-torque system.