????? ??????? ?????? ??????? ????? ????? ??????? ????? ??????? ??????????? ??? ?????? ?? ???? ????? ???? ????? ??????? ?????? I had that, much too. It was a mechanical inertia switch. I used to activate it manually when parking at the airport as well as other find locations. Forgetting I'd performed so resulted in an "uh-oh" instant or two. intro