Aerotech - with regard to the turboprop - you could approach - but there isn't really any reason.
Only reason I have ever had to approach a turboprop running was the stupid early Metros where the ground power receptacle was in the side of the nacelle - brown trouser experience that.
Have been in the wheel well of a Dash 8 with engine in Start/Feather leak checking a hyd component that could only be powered up off EDP.
Otherwise - stay the f*ck away - especially at power.
Dash scares me at power inside let alone anywhere near it outside - people give me strange looks when I put on the belts before giving it the onions - I've seen one leap before.