What type of data is considered "acceptable" for aircraft alterations?

The designation of acceptable data for aircraft alterations is significant, particularly when it comes to ensuring safety and compliance with FAA regulations. AC 43.13-2A is recognized as a comprehensive source of guidelines and methods acceptable for the maintenance and alteration of aircraft. This advisory circular outlines procedures and standards that mechanics and engineers can follow to ensure that any modifications meet safety standards and comply with regulatory requirements.

AC 43.13-2A includes both general and specific guidance on acceptable materials, methods, and techniques for various alterations. It emphasizes practical maintenance techniques and offers insight into safety standards that can be followed to achieve compliance, which is critical for any alterations made to an aircraft.

While other options like Manufacturer's Letters, Technical Standard Orders, and Service Bulletins provide valuable information and can also be used in different contexts, they do not have the same broad applicability and authority as AC 43.13-2A when it comes specifically to alterations. Each of those documents serves specific purposes and may pertain to particular components or systems rather than providing a comprehensive framework applicable to all types of alterations. Thus, AC 43.13-2A is considered the authoritative guidance for acceptable data in this context.