Do engineers really round pi to one digit (details inside)?

Somewhere in the Flutherverse I remember a jelly saying that in his masters engineering class that they only use one significant digit for assignments… Do the full time students use 3 instead of 3.142817, or even 3.14 when building a bridge after they graduate? Can this be one of the reasons that space probes keep malfunctioning and bridges collapse? Or do different engineers have different values for pi beyond 3? ”:http://www.fluther.com/10126/314159265”