1. Make sure the blades are spinning on the helicopter (Either sit in the pilot seat and keep the engine running and let another player proceed with step 2 or leave the heli and proceed with step 2 before the blades comes to a halt)
2. Face the AH9 or MH9 from the side (Pilot seat or Co-pilot.
3. Vault "into" the heli by pressing V
4. Standing in the middle of the heli will damage the heli.