How to create Turbulance on an aeroplane

Hi, I have a standard first person controller inside of an aeroplane that is supposed to be going down.

I have hundreds of models, lights, etc, inside of the plane; so I added all of those, except for the character controller to a new game object, which I have animated up and down.

When I play the animation in the scene view-port, it is a bit clunky, but the animation works. The problem is that when I walk through the trigger that is supposed to activate the animation, nothing happens... The rest of the animations that the trigger sets off work, it is just the one that has to shake the whole plane.

I have a feeling that the problem is because I have to many objects attached to that animation.

Any fast help or advice would be greatly appreciated, as I need to have this done by Saturday evening.

PS: I have read some posts about using camera shake for things like earthquake, but I don't feel that it would be realistic, as I want to see the walls of the plane around me move and effect my character.