JPcont:
From the UAL 1175 report:
"Beyond 0.032” deep from the origin was a region of predominantly fatigue striations, suggesting stable low cycle fatigue (LCF) propagation (Figures 17– 1 9). A striation count performed within a rectangular zone through this stable LCF region ~0.032” –0.153” from the origin estimated 5500 cycles of LCF crack propagation (Figure 20). The blade was last inspected via thermal acoustic imaging (TAI) ~1400 cycles ago in 2015. "