A Comparative Safety Analysis of New, Rebuilt, and Overhauled Aircraft Reciprocating Engines

Abstract

This study examines the safety-related characteristics of new, rebuilt, and overhauled aircraft reciprocating engines through a qualitative literature review. FAA regulations, advisory circulars, manufacturer documents, and relevant previous studies were reviewed. Safety, reliability, and service life were treated as distinct concepts, and the literature was analyzed using regulatory definitions, maintenance factors, and accident-related evidence. The reviewed studies did not provide engine-type-specific accident or failure rates sufficient for a direct empirical safety ranking. Operational safety was associated mainly with TBO management, maintenance standards, workmanship, installation quality, operating practices, condition monitoring, and continuing airworthiness management. Rebuilt engines may be approved to the same tolerances and limits as new engines under applicable FAA provisions, whereas overhauled engines may differ depending on the applied limits and overhaul scope and quality. These differences may affect service-life estimation but do not directly demonstrate differences in accident probability. Therefore, each engine type should be evaluated based on its maintenance and operating conditions rather than an intrinsic safety hierarchy.