Change to 407 FMS
Famously Bell are said to have added an FMS after a 407 performed a pretty impressive display at a South African airshow (video available to watch at the regular outlets - the commentator is a tad surprised).
As the proud new owner watched gleefully, sat alongside was the local Bell rep. As the display ended the rep turned to the owner and advised him the aircraft was good only now for scrap...and soon thereafter the FM supplement appeared banning aerobatics (although as this threads notes, the definitions are vague). Shame, since the airframe is more than strong enough.