FAA Part 135 does NOT allow single engine land aircraft to be operated overwater beyond gliding distance or in IFR with paxs.
I believe there is a carve-out in the regs to permit Caravans and Pilatus to operated overwater and SE IFR. Perhaps someone could point me in the direction where I can read that reg permitting such activity.
Two recent engine failures and you think they be on these cases like the situation of 3 pilots falling asleep from sleep apena triggered a bunch of new regs.