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A thorough study of Boeing’s 737/300 model in 2005 reaches the conclusion that the designer of the
aircraft had decided not to follow the simple rule of putting in place a unique warning per grave
emergency. Additionally, international aviation community had long ago been informed about the
necessity to also take human factors principles into account in the design of flight checklists, Degani
&Wiener (1990) state, but unfortunately a mechanism, either driven by an International Regulatory
Body or the Manufacturer itself, failed to lead these changes.
While the Barriers that are identified as “Missing” were reported in good faith, still the &R&R