(1) Number of toxic fluids (reduce):
(3) Number of systems with BIT / BITE (increase):
(4) Number of confined spaces on vehicles (reduce):
(5) Number of hours for turnaround between launches (reduce):
(6) Number of different propulsion systems (reduce):
(7) Number of unique stages, flight and ground (reduce):
(8) Number of active ground systems required for servicing (reduce):
(9) Number of purges required (reduce):
(10) Number of components with demonstrated high reliability (increase):
(11) Number of potential leakage / connection sources (reduce):
(12) Number of active systems to maintain a safe vehicle (reduce):
(13) Percent (%) of propulsion system automated (increase):
(14) Number of hands on activities required (reduce):
(15) Number of active components required to function including flight operations (reduce):
(16) Technology Readiness Level (TRL) (increase):
(17) Number of different fluids (reduce):
(18) Mass fraction required (reduce):
(19) Number of systems requiring monitoring due to hazards (reduce):
(20) Number of parts (different, backup, complex) (reduce):
(21) Number of expendables (fluid, parts, software) (reduce):
(22) Number of checkouts required (reduce):
(23) Number of pollutive or toxic materials (reduce):
(24) Number of inspection points (reduce):
(25) Number of propulsion sub-systems with fault tolerance (increase):
(26) Number of engines (reduce):
(27) Average Isp on the reference trajectory (increase):
(28) Number of manhours (c/o, handle, assemble, etc) on system between LCF/HCF (reduce):
(29) Number of criticality 1 failure modes (reduce):
Design Features (30 through 64)
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Edgar Zapata, NASA Kennedy Space Center
Shuttle Process Engineering Directorate, Fluid Systems Division