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The failure mode in the main rotor blade was identical to the failure mode documented in Occurrence 199000089 (in excess of 2,200 hours TIS), and on manufacturer tested-to-failure blades (in excess of 2,200 hours TIS). The under-reporting of helicopter flight time probably resulted in an actual service life of the failed main rotor blade in excess of the manufacturers stated limits. There has been a history of main rotor blade failures of the R22 main rotor blade during its evolution. Those events have led to a series of modifications to address the anomalies discovered. Exceeding the service life of a dynamic component such as a main rotor blade will exacerbate the possibility of undetected catastrophic component failure.

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