ALBANY — A high-strength bolt snapped at the threads as an ironworker, Jimmy Jordan, used a torque wrench to tighten it into a steel plate connecting two massive girders. A piece of the broken bolt bounced off an overhang and split his lip open as he looked up. It was January 2016, and Jordan was part of the team constructing the Tappan Zee Bridge replacement at the project’s main assembly site along the Hudson River in the Port of Coeymans, about 100 miles north of the bridge. Construction of the $3.9 billion twin span, which would ultimately be named after Gov. Mario M. Cuomo, had been under way for a little more than two years when Jordan’s injury led to a series of revelations that would call into question the new bridge's structural safety.