A funny idea if you have a buddy on Karkand...

Get you (or the buddy) to be support and fly the littlebird
The other person drop timed c4 over enemy locations and repair the heli (as engineer)

This should cause a lot of havoc. For an even greater punch, fill the seats with C4ers. However, the 2nd-seater should be a medic since he/she is protected from gunfire.

Tried it with grenades and although not that great, lots of room for improvement (nades dont do much dmg)