Targeting multiple movie clips in motion tweens--ACK!

Hi–

I am trying to target multiple tweens, trying to turn their visibility false/true. I have named each tween in the tween properties box, and I have targeted them like this: plane.plane2.tween1._visible=false (and so on), but no go! Only the first of the seven is actually affected–the others are not.

Driving me around the bend… Any help wold be most welcome!