A Boeing engineer raised concerns about the reliance of a critical 737 MAX flight-control system on a single point-of-failure as early as December 2015, documents shared by House Transportation Committee chairman Peter DeFazio (D-Ore.) show. In an internal Boeing email, an anonymous employee asked, “Are we vulnerable to single angle-of-attack (AOA) sensor failures with the [maneuvering characteristics augmentation system, or MCAS] implementation or is there some checking that ...


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