What is the type certificate number and certification basis for a Cessna model C421B?

The correct choice for the type certificate number and certification basis for a Cessna model C421B is indeed A7CE, which falls under CAR Part 3. The C421B received its type certificate from the Civil Aeronautics Administration (CAA), and CAR Part 3 regulations were relevant for certification during the time this model was introduced.

The significance of the type certificate number A7CE indicates that this particular model meets specific airworthiness standards set forth during its certification process. CAR Part 3 laid out the requirements for the design and construction of aircraft, and its application to the C421B demonstrates that the aircraft operates safely within these established guidelines.

Understanding the type certificate number and its corresponding regulations is crucial for A&P mechanics and those holding an IA because this knowledge ensures compliance with maintenance and airworthiness standards. This information is foundational for maintenance procedures, ensuring that any work performed on the aircraft adheres to the technical specifications outlined by the manufacturer and regulatory authorities.