Helicopter disturbance around Harlaching

For those of you who know how to find these things out, any idea what was happening around Harlaching at 11ish last night? Helicopters were so close I thought they were going to land on my roof!

Isn´t there a hospital there, and do they perhaps have a helipad?

There is, and that is probably what it was, but I have NEVER heard a helicopter sound this close and loud. Maybe there were exactly the right wind conditions or whatever to make it sound as if it was landing on my roof, or maybe the chopper was lost

Do you have a circle with an "H" in it on your roof?