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I am trying to locate specific regulations related to passenger compliance during an emergency under 135 operations. Specifically if a passenger, though "not" interfering with a crew member, is not adhering to crew member instructions.

I know about 14 C.F.R. 121.317(k): “Each passenger shall comply with instructions given him or her by a crewmember regarding compliance with” seat belt requirements. But that only refers to seatbelts. How about any other direction from the crew?

How about any regulation that requires pilots to notify passengers of turbulence or any hazard to flight? What if we are expecting turbulence along our route. Are we required to notify passengers by regulation? It's obviously the correct thing to do but is there a "regulation" that specifically requires it? In this case I am being told we are not required to do anything more than tell passengers to put seatbelts on. Supposedly there is no requirement to brief passengers beyond the original passenger brief before take off and that the FAs are responsible for that. The captain and FO don't have to say anything to the passengers beyond the before flight brief required in 135.117.

I have seen AC 121-24C which includes the "suggestion" of a prelanding briefing for 135 ops but nothing that requires it.

There doesn't technically seem to be any requirement for passengers to follow directions of crew except for seatbelts and smoking.

Otherwise it seems to be the wild west at least in 135 charters.

Nor does there seem to be any requirement to notify passengers of upcoming issues along the route of flight or landing other than the AC I quoted above but nothing is in a regulation that I can find.

Can someone suggest something I am missing here? This does involve a specific incident.