Barron Associates successfully completed a 5 year SBIR Phase III program funded by NASA Glenn Research Center. The program focused on developing runtime assurance (RTA) methods for turbofan engines with advanced control systems. In year 4 of the program, Mr. David Neal developed a new design approach that improved the performance of NASA’s engine protection logic. In the final year, Dr. John Schierman constructed a runtime assurance software toolkit in Matlab and Simulink. NASA plans on releasing this toolkit as freeware to aid engineers in constructing RTA systems for new applications.