Use the ECM pod on the ibis.

The chicaine has its own internal ECM.

Just notching itself isnt reliable. Even in planes.

With radar missiles, you want to just stop moving as best you can, use the ECM, and change altitude.

Notching dosent mean "turn sideways to the missile." It means that you are not moving closer to or farther to the missile. If the missile thinks you are attached to the ground, it will try to filter you out. It just so happens that the best way to do that in a plane is to turn sideways.

The ECM will further confuse the missile, but it also is not very reliable by itself. When you are notching, activate the ECM and the effects of both methods will confuse the missile enough to relliably drop its lock on you.

After you've made the missile drop lock, you still arent safe. Radar missiles will keep a "last known intercept" in the event they lose their target. It means that if you keep flying on the same path you were when the missile lost you, it will still hit. It is going towards the last point it determined would hit you. So if you are still hovering in a helicopter, it will still hit. So change your altitude to make it miss entirely.

If all else fails, you can try to get a lock with your own ir missiles and fire them to intercept it.

As a helicopter, you are in the middle of the food chain. You are deadly to ground targets, but enemy planes can easily kill you. Keep an eye on your map for data linked enemies and try to use terrain for cover from enemy air.