In order to meet the requirement of airworthiness regulations on engine life limited parts (ELLPs)

a theoretical model integrating stress-strength interference model

linear elastic fracture mechanics and zone based probabilistic analysis was established to assess the failure risk of ELLPs. The numerical algorithm and the computer program were also developed. The method was calibrated by the test case provided in the advisory circular. The assessment results are 1.45×10-9 times/cycle without any non-destructive inspection and 1.0×10-9 times/cycle with an inspection at 10000 cycles

respectively. The results measure up to the calibration test case very well

indicating the method to meet the terms of the regulation

thus is applicable to the current civil engine type certification.