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The paper delivers a critical review of the research data on the crack initiation and crack growth\udpatterns characteristic of the components of the spline-bolted joints between the propeller shaft and reducer\udshaft at An-24, An-26, and Il-18 aircrafts. Cracks in the shafts nucleated because of reduced bolt-fastening\udforce. Actually, the bolt (bolts) failed first (also by fatigue) and then fatigue cracks nucleated and grew in the\udshafts, the spline surface fretting zones and/or sharp edges of the attachment (bolt-conducting) holes making\udthe crack origin sites. The crack growth history shows itself through the regular Macro-Beach Marks, each mark\udsequentially pointing to the next loading event of the propeller shaft, i.e., to each next flight. The cracks cease\udgrowing for some while in the airscrews and their shafts just replaced to another aircraft. For the airscrew\udshafts, the critically assessed data show the crack growth period Np ranging as five to ten percent of a total\udrunning period Nf . We recommend performing nondestructive inspection of the airscrew shafts on every 250-\udhour running period to ensure the safety flights

In-service fatigue cracking of the propeller shafts joined by a spline-pinned construction to the engines of AN-24, AN-26, and IL-18 aircrafts