The MD 520N NOTAR is a five-seat, single-engine helicopter designed and built by McDonnell Douglas Helicopter Systems. It is a unique helicopter that features a NO TAil Rotor (NOTAR) system, which uses a fan and jet thrusters to provide anti-torque control and directional stability, eliminating the need for a tail rotor. This makes the MD 520N NOTAR quieter, safer, and more maneuverable than traditional helicopters. The aircraft is powered by a Pratt & Whitney Canada PT6A engine, which provides excellent performance and reliability. The helicopter has a sleek and modern design, with a spacious and comfortable cabin that can accommodate up to five passengers. The MD 520N NOTAR is commonly used for law enforcement, emergency medical services, executive transport, and aerial surveying. With its innovative technology and advanced features, the MD 520N NOTAR remains a popular helicopter among operators and pilots around the world.