Safety Assumptions

Producers of high energy rotating engine components are adequately validating critical manufacturing processes such that robust tooling and process parameters are utilized to assure that no manufacturing anomalies are introduced and that components comply with the design intent.

At the time the Pensacola Fan Hub was designed, the engine industry lifing analysis process assumed defect free material 100% of the time. AIA/FAA introduced probabilistic design analysis tools that assumed defect distribution based on defect rates derived from the Rotor Manufacturing Project Lessons Learned Database.

Producers of high energy rotating engine components employ NDT methods that are capable of detecting both geometric and non-geometric (metallurgical) manufacturing induced anomalies.

Airline maintenance NDI personnel are adequately trained and NDI procedures are adequately designed and implemented such that detectable cracks in critical rotating engine parts will be detected.

Original equipment manufacturers (OEM) are providing adequate oversight of critical manufacturing process validation functions, including critical part and process suppliers, such as machiners, forgers, melters, etc. or first, second or third tier suppliers.

FAA is providing oversight of the OEMs  to ensure that OEM oversight of suppliers and vendors is adequate.

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