wrote:

If as PNF you notice that the PF has just turned on to the wrong runway
to commence the takeoff roll, are you permitted to alert him (can't see
why not, actually, if lives are likely to be on the line) to it or are
you expected to just shut up and let him make the call? Presume for the
moment that the Capn is PF, which I hear wasn't the case in the LEX
incident...

In the LEX incident, the captain had to steer the aircraft and line it up
on the runway, since he is the only one with access to the tiller on that
type of aircraft. The FO then took over for the takeoff. Therefore, each
had a hand in the decision to use the runway.