Comment by rainsford

> Also why is training happening in such dangerous path where even if the instructions were followed the aircrafts could get as close as 30 m apart.

I'm not sure that's a correct understanding of how the approach path to the runway and the helicopter route are supposed to interact. So far as I understand, the intent was never that a helicopter and airplane were supposed to be able to happily barrel along their respective paths within worrying about running into each other. That kind of thing happens a lot in aviation, but the separation distance is much, much larger.

Instead, one was supposed to see the other and use their eyes to visually stay away (ideally by much more than 100 ft). That's what was supposed to happen here, and what the instructor pilot in the helicopter said they were doing. Visual separation is also used a lot in aviation, often in places where there are no narrowly defined paths at all, but it carries the risk of aircraft not seeing or misidentifying each other, which could be what happened here.