| This study's purpose was to develop a simulation model to determine the adequacy of the finite populations of the re-useable Forward and Aft Integrated Electronics Assemblies (FIEA and AIEA) in the Space Transportation System Solid Rocket Booster to support a 20-year operational life extension. Flight rate (4, 6 flights per year) and refurbishment times (triangular, exponential distributions) were the cases studied for both components. The FIEA population was 99.22% successful in meeting all demands at the lower flight rate over the 20-year study period. The high flight rate resulted in an 18.75% success rate. The AIEA inventory was 12.5% successful at the low flight rate and 0% successful at the high flight rate. Mathematical equations for the AIEA high flight rate cases were developed. More detailed refurbishment time data is needed to further refine this simulation. |
