AT: "at"
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A plasma inducer was a device that malfunctioned on the USS Enterprise-D in the anti-time past before the ship's maiden voyage to Deneb IV and, given Jean-Luc Picard's preexisting knowledge of the problem, likely also malfunctioned on the ship at some point in the original timeline.
In the anti-time past, Captain Picard used his knowledge of his own past to assist Miles O'Brien regarding a problem with the the warp plasma inducers on the USS Enterprise-D by providing O'Brien with specifications to bypass the secondary plasma inducer. (TNG: "All Good Things...")