INTERCOASTAL CI, LA, USA
N2258F
BELL 412
WHILE IN CRUISE FLIGHT, THE PILOTS HEARD A LOUD POP AND FELT A SEVERE CYCLIC CONTROL VIBRATION. AN IMMEDIATE PRECAUTIONARY LANDING WAS MADE. AN EXAMINATION REVEALED THAT THERE WAS A FATIGUE CRACK IN THE TRAILING EDGE OF THE BLUE, MAIN ROTOR YOKE FLEXURE, PN 412-010-101-113. THE HELICOPTER AND THE FIXTURE HAD ACCUMULATED 1071 HRS OF FLIGHT TIME. THE LIFE LIMIT OF THE FAILED COMPONENT WAS 5000 HRS.
Source: NTSB Aviation Accident Database
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