Mi-8...Jacob's ladder..how to use?

[HirooOnoda]

Can't find it in the rules where Helicopters can't land in certain hexes (rough, broken or rocks?).

Yet, I see my Hips have "Jacob's Ladder". Does this allow them to hover and not land, thus allowing me into certain hexes I can't land in?

Thanks!

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Okay, I found the rule, but it didn't work. The cost is 1/2 the cost of the infantry's movement. The infantry start the turn with 24 movement points, I flew to a point where the infantry had 15 points left, and when I went to unload it said,"Movement points exceeded". I had over 56 points left on the Hip.

What am I missing?