The gimbaling of the engines worked as planned, but the associated hydraulic system “exceeded the pre-set test limits that had been established,” resulting in the shutdown, according to NASA.

NASA carried out a critical hot fire of the redesigned RS-25 engine April 26 at NASA’s Stennis Space Center in Bay St. Louis, Mississippi, demonstrating the gimbaling, or pivoting, capabilities ...

That test was cut short when one of the engines exceeded some preset parameters while gimbaling, which means adjusting its angle slightly, and the computer system in place shut everything down ...

NASA carried out a critical hot fire of the redesigned RS-25 engine April 26 at NASA’s Stennis Space Center in Bay St. Louis, Mississippi, demonstrating the gimbaling, or pivoting, capabilities ...

The full-duration Hot-Fire test plan has three gimbaling test objectives; after the first TVC check was completed, a longer frequency response test was planned beginning at T+2 minutes 30 seconds ...

Astronomy Solar System Mercury Space History Photo: Project Mercury - AWT Gimbaling Rig News By NASA Archives published May 2, 2014 ...