This comprehensive service and repair manual covers Cessna 401 and 402 aircraft, specifically the A and B series models, manufactured between 1967 and 1978. It provides detailed instructions and technical specifications for maintaining and repairing these aircraft. The manual includes extensive information on various aspects of the aircraft, such as engine systems, avionics, electrical systems, hydraulic systems, and airframe components. It also contains detailed diagrams, illustrations, and exploded views to assist mechanics and technicians in understanding and performing intricate repair procedures. This manual acts as a valuable resource for anyone involved in the maintenance and repair of Cessna 401 and 402 aircraft, ensuring that these aircraft are kept in top condition and operating safely.

The Cessna 401 and 402 are twin-engine, high-wing, fixed-wing aircraft produced by Cessna Aircraft Company. The 401 was introduced in 1967, followed by the 402 in 1969. Both models are known for their versatility, being commonly used for commercial passenger transport, cargo hauling, air taxi operations, and even as executive transports. The Cessna 401 and 402 are powered by two Continental or Lycoming engines, with the 401 typically featuring the IO-520 engine, and the 402 utilizing the IO-720. They offer a comfortable cabin accommodating up to 10 passengers, equipped with a pressurized cabin and typically featuring a retractable tricycle landing gear. The Cessna 401 and 402 are divided into series, with the 401 being available in the 'A' and 'B' series, while the 402 comes in the 'A', 'B', and 'C' series. The 'A' series models feature a more basic interior and avionics, while the 'B' series offers enhanced comfort and avionics upgrades. The 'C' series, specifically for the 402, brings further refinements and performance enhancements. The 401 and 402 are renowned for their reliability and robust design, making them popular choices for various aviation applications. While production ceased for both models in the late 1980s, they continue to be a significant presence in the general aviation market, with a large fleet still in active operation around the world.