GE Aviation is launching the TruEngine LLP program to evaluate the operating history of used life-limited parts. LLPs undergo a rigorous back-to-birth records audit and engineering review to evaluate their configuration and maintenance history relative to airworthiness limitations substantiated by GE and documented in the engine manual. LLP will be qualified at the part level and at a specific time-since-new and cycles-since-new interval. TruEngine LLP will be rolled out in stages and ultimately will cover the CF34 (which powers the Bombardier Challenger [601 and later] and CRJ, and Embraer E-Jets), CFM56, CF6, GE90 and GEnx.