Put helicopter on map and put a waypoint with "safe behaviour". Set time to nighttime.

Spawn player in cargo of helicopter, look at the front end of the skid from first-person, notice that you don't see the collision light.

Alternatively spawn heli with player as pilot, turn on collision lights...

I checked again. The issue is a bit more complex: When you sit on the outside "bench" of the mh-9 you can spot a bit of the collision lights. but you don't see any "glow". also, though the lights are screened to the inside, i think they should be barely seen from pilot's seat. hard to explain.
better see for yourself.