Okay, you're using the Eject group from chinook script found in the ed depot?
Just tested it meself, and the problem is they are all getting tangled up with eachother, that's why they die. They like collide mid-air, resulting in AI mush.
Will see about modifying the script to make it work better.
2 minutes.
edit
Is your chopper flying at "limited" speed?
If so, then that's your problem, have it fly in at least "normal" speed and the default script should work just fine.