This comprehensive service repair manual, designated D817-15-13, is specifically tailored for Cessna 421 A/B models manufactured between 1968 and 1975. Spanning an impressive 1271 pages, it provides detailed technical information and step-by-step instructions for maintaining and repairing these aircraft. The manual includes comprehensive coverage of various systems, components, and procedures, ensuring technicians have the resources they need to perform a wide range of maintenance tasks. The manual includes thorough diagrams, illustrations, and technical specifications to aid in understanding and executing complex repairs. With its extensive scope and meticulous details, this manual serves as an indispensable resource for aircraft mechanics, technicians, and anyone involved in the upkeep of Cessna 421 A/B aircraft.

The Cessna 421 is a six-seat, twin-engine, high-wing, fixed-wing aircraft manufactured by Cessna Aircraft Company from 1968 to 1985. It was a popular choice for corporate and private transportation due to its versatility, reliability, and comfortable cabin. The 421 series saw several variations, including the 421A, 421B, 421C, and 421 Golden Eagle. The 421A and 421B, specifically targeted in the D817-15-13 service repair manual, were introduced in 1968 and 1971 respectively. The 421A featured a 19-foot wingspan and was powered by two Continental TSIO-520-C engines, each delivering 310 horsepower. The 421B incorporated several improvements, including a larger wingspan of 20.5 feet, a more powerful TSIO-520-D engine producing 350 horsepower, and increased payload capacity. The Cessna 421 A/B, covered by the D817-15-13 service repair manual, represented a significant advancement in light twin-engine aircraft design. These models offered exceptional performance, providing a cruising speed of around 230 knots and a range of over 1,000 miles. The spacious cabin could comfortably accommodate six passengers, and the aircraft's versatility allowed for a variety of applications, including business travel, cargo transport, and aerial photography. The D817-15-13 service repair manual serves as a vital resource for mechanics and technicians responsible for maintaining and repairing these aircraft, ensuring safe and efficient operation. This comprehensive document provides detailed instructions, diagrams, and specifications covering all aspects of the 421 A/B, from engine maintenance and avionics systems to airframe repairs and corrosion control.