Which publication is used to determine whether a powerplant repair is major or minor?

The Federal Aviation Regulations, Part 43, appendix A provides a clear framework for classifying maintenance activities, specifically distinguishing between major and minor repairs. This regulation outlines the definitions and thresholds for what constitutes a major alteration or repair, serving as a foundational reference for aviation maintenance professionals.

By consulting this appendix, individuals can ensure compliance with regulatory standards, which is essential for maintaining aircraft safety and airworthiness. It is critical for maintenance personnel to have this guidance available, as it informs the decision-making process regarding whether a proposed powerplant repair will impact the aircraft's structure, safety, or operational capabilities in a significant way.

Other publications and manuals may provide valuable information or guidelines related to maintenance practices, but they do not specifically define the criteria needed to classify repairs in the same authoritative manner as the Federal Aviation Regulations. Consequently, these other resources serve as supplementary guidance rather than the primary reference for determining the repair classification.