Use the AT-4. Javs and Stingers will simply blow it up. You have to have scavenger and enough ammo pickups(around 3 or 4).
I know it uses a stinger in the vid, but my stingers always blow it up
I've been noticing that stingers make Attack Helis (not Pavelows) spin out and not blow up. I don't know if this will help more or...