Originally Posted by
ATC Watcher
Intruder :
Was the Cessna supposed to stay below a certain altitude ?
Given that the collision was outside the Charleston Class C airspace, it's pretty unlikely that there was any altitude restriction applicable to the Cessna.
If the Cessna was underneath the outer shelf of the Class C airspace, he's have been required to remain below 1200 ft MSL unless he'd established 2 way communication with Charleston Approach, but he was well outside that area.