![Illustration of the Aquarius/Satélite de Aplicaciones Científicas (SAC)-D satellite observatory in space with Earth in the background. Credit: NASA](https://appel.nasa.gov/wp-content/uploads/2022/03/Spotlight-SAC-D-Aquarius-3-670x380.png)
Spotlight on Lessons Learned: SAC-D DC/DC Converter On-orbit Failures Likely due to Over-testing Prior to Usage
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An international Earth-observing mission to study the salinity of the ocean surface ended in 2015 when an essential part of the spacecraft’s power and attitude control system stopped operating due to over-testing prior to launch.