If a complete listing of required equipment is not found in the type certificate data sheet, where else could it potentially be found?

The Approved Flight Manual (AFM) is the correct source for a complete listing of required equipment if it's not found in the type certificate data sheet. The AFM provides detailed operational information and specific equipment requirements for the aircraft, which includes necessary systems, instruments, and emergency equipment needed for safe operation. This manual is essential for pilots and maintenance personnel and ensures compliance with regulatory and safety standards.

In contrast, while the Aircraft Part Catalog, Aircraft Maintenance Manual, and Service Bulletins serve important roles, they focus on different aspects of the aircraft. The Aircraft Part Catalog lists parts and components, the Aircraft Maintenance Manual covers maintenance procedures and guidelines, and Service Bulletins provide updates or mandatory instructions regarding aircraft safety and performance. None of these documents are designed specifically to detail the required equipment in the operational context the AFM provides.