Originally Posted by
ATC Watcher
For me the key point of this accident is the 100 ft procedural separation planned between a Heli route and a non precision ( e.g visual) approach path . The rest are just more holes in the cheese.
Yes, that does seem nuts. It is as if they decided to ignore all the tolerances (altimeter accuracy, pilot accuracy, etc) and pretend everything is spot on.
There's a reason for the normal 500' or 1000' separation between traffic, eg enroute cruising altitudes. Someone once worked out the tolerances and margins.