Final answer:
The Index section of the Illustrated Parts Breakdown provides a sequential alphabetical listing of all part numbers for easy reference in the technical order.
Step-by-step explanation:
The section of the Illustrated Parts Breakdown (IPB) that provides a sequential listing of all part numbers appearing in the technical order is known as the Index. This section is typically found at the end of technical manuals, especially in non-electronic versions, and is organized alphabetically. It serves as a critical resource for quickly locating and cross-referencing parts by their assigned numbers, thereby facilitating efficient maintenance and repair tasks.