[Jack Hydrazine]

I’ve seen three versions of why the helicopter went down.

1) It got too close to the walls of the compound.
2) Mechanical problem.
3) Hit by fire from the ground.

There is a theory out there that says that this helo got a little too close to the building and caused a ground effect problem resulting in loss of lift on the rotor blades.

Who knows which version is correct.

[piasa]

I tend to lean towards #1 as most likely.