. The aim of the presentation is to present “resident pathogens” identified in Systems Engineering (SE) practices in the aviation industry that led to the two fatal accidents of Lion Air Flight 610 and Ethiopian Airlines Flight 302 involving Boeing 737 Max- 8 airplanes. The fatal accidents led to the tragic loss of 346 lives. A Cybernetic Risk Management model drawing upon Nobel Prize winning Heuristics and Biases (H and B) approach is used to study the accidents and for the audience extend the results published to raise awareness of and improve SE Professionalism. (Appicharla.S, 2023a) may be consulted for the results already published. T