NTSB Identification: FTW83IA053
14 CFR Part 91: General Aviation
Incident occurred Thursday, December 02, 1982 in INTERCOASTAL CI, LA
Probable Cause Approval Date: 12/02/1983
Aircraft: BELL 412, registration: N2258F
Injuries: 2 Uninjured.

NTSB investigators used data provided by various sources and may not have traveled in support of this investigation to prepare this aircraft incident report.

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.

The National Transportation Safety Board determines the probable cause(s) of this incident to be:

ROTOR SYSTEM,MAIN ROTOR HUB YOKE(SPINDLE)..FATIGUE

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