Transport Canada 2020-13

AD mandates the use of the manual low cycle fatigue (LCF) counting method to ensure that the impeller and high-pressure compressor rotor do not exceed their published life limits. Prompted by manufacturer discovery that the automated damage tracking system (ADTS) might under-count the number of cycles accrued by the impeller and the high-pressure compressor rotor. The impeller and HP compressor rotor are both life-limited components and exceeding their published life limits could result in the failure of these components.