Here's the problem then; why fly below its minimum designated altitude in heavily contested areas? What is its minimum altitude for efficacy, and why would the Russian pilots fly below that, making a supposed life-saving system like that completely ineffective? It doesn't make sense, my bro. Russians are not that incapable by any means.
If you look at the picture of the outside sensor with the rotating camera ball, it's clear that it can point straight down even. If anything, the bracket would impede its upward motion more than anything else. That only means it should pick up incoming missiles even from directly bellow the helo, so it shouldn't have any issues picking up missiles at low altitudes.
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Also, what happened to the jamming aspect? I sure hope the EAF/Army helos like that MI-17 medic transport has better success with those than these poor Russian helos I tell ya.
The only 2 things I can think of is either those 2 helos were hit while on the ground, or, the ones hit while flying didn't have the system installed?