Capitol Hill is wading-in on the 737MAX issue and is concentrating its gaze on the US Federal Aviation Administration (FAA). How is it that the MAX Maneuvering Characteristics Augmentation System (MCAS), a critical system, relied on one single Angle of Attack (AOA) sensor with no back-up and why was it not considered an issue during the design and testing phase by Boeing or the FAA during certification?  Indeed, US news outlet CNN is reporting that an AOA sensor failure and its impact on MCAS was not tested during the official flight test programme and only tested after the Lion Air

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