Originally Posted by
roundwego
The barbecue plate is the slang term for the gearbox "flexible mounting plate". It is the interface between the base of the gearbox and the airframe and it is designed to resist the rotational forces acting on the gearbox. It is made from titanium but, as its formal name suggests, it is flexible. It has been in use on the AS332 series and H225 for many years.
I think its made of Marvel on the 225.