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A modified Hughes SIT-5 thruster has been life-tested at the Lewis Research Center. The final 2700 hours of the test are described with a charted history of thruster operating parameters and off-normal events. Performance and operating characteristics were nearly constant throughout the test except for neutralizer heater power requirements and accelerator drain current. A postshutdown inspection revealed sputter erosion of ion chamber components and component flaking of sputtered metal. Severaldoi:10.2514/3.62127 fatcat:tb3weukfsfeendiqb5qnbo2atu