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US Congress hearing today shoulda had Sully. He knows about AoA, leading edge devices, underslung motors, crew coordination and such.
This Safety Hearing was the 1st in a series of at least 2 hearings. It was announced, and confirmed during this 1st hearing, that Boeing will be invited to the 2nd hearing. Date as yet unknown.
So at this point in time we have two international safety investigations on Lion and Ethiopian, a series of Congressional hearings, FBI investigation (I am not sure if this is technical support or indeed a criminal investigation), and two DoT IG investigations on the 737, the first referring to Southwest engine problems and maintance (perhaps including looking into the insertion of acquired aircraft) and the second on the MAX (which reports to the DoT and parallel to Congress). Not to forget the NTSB safety investigation into the Southwest engine fatality case. They all may add some pieces and answers to the puzzle that we are discussing here.