Problem of early detection of rotor blades cracks is particularly important for flight safety and economy. An early detection of fatigue root cracks in first stage compressor blades is of a great importance for flight safety due to dimensions and mass of blades. The broken blade causes as a rule the engine break-down, which in case of an one-engined aircraft night be a formidable danger to the pilot. Some results of investigations and devices which enable an relatively early detection of compressor blade cracks in an airborne engine as well as keeping the crew informed of this fact in order to get safety to the homebase are discussed and presented in this paper.
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