A question I have asked but have not yet had fully answered relates to seats and fully compliant airframes like the AW139.
As civvie machines it seems that anyone carried should have [must have?] a fully compliant seat to place themselves on.
At the moment older airframes [pre-JAR] can get away with sitting bums on floors so such as the BK117 can get away with having insufficient headroom for cops in proper stroking seats.
So is it should have or must have?
Picking up survivors from the sea is truly an emergency where you can have bums on the floor for the excess numbers but is transporting firemen to an emergency not likely to be requiring the compliant crashworthy seats for each and every one of them?
I cannot find the finite answer. Any thoughts?