Another source claims the failure of an AoA sensor was not flight tested and instead was “analysed in the design and certification” of the aircraft. The AoA sensor was replaced. The report suggests the FAA issued two directives for various Boeing aircraft models before the 737 MAX was released, indicating Boeing was aware of the potential for the sensors to cause problems in its planes. “Boeing did not intentionally or otherwise deactivate the disagree alert on its MAX aeroplanes,” the company said in a statement. Boeing has conceded in both accidents, the MCAS was triggered by faulty readings from a single sensor that pushed the planes’ noses down.

Source: Ethiopian News May 01, 2019 02:26 UTC