Prevailing Cultural / Organizational Factors

Prior to this accident, a CF-6 engine had never experienced a fan hub failure. The engine was certified in 1970 and operated successfully for millions of fleet service hours until 1989. Though it had been discovered that the manufacturing process (double VAR) of the fan disk produced a higher than desired rate of defects, it was believed that a program of detailed inspections would detect and eliminate components that had become unserviceable, and preclude the need to mandate replacement of fan disks that had been manufactured using the double VAR process.

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