Its the one about Chartered Engineer status and Fellowship of the RAeS, here on this forum McAero. Engineers have a hard time getting recognition for their knowledge and capabilities.
Many companies have graduate entry management trainee schemes and they don't necessarily discriminate on the basis of what degree you have. These are general management fast track schemes, but it would be a shame to waste your university studies by moving straight to another field, better to stick with the avionics engineering.
It takes practical experience as well as academic knowledge to be a successful engineer. There's no way to gain credibility without being prepared to roll up your sleeves and get your hands dirty. At least in the beginning. Business management can come later, once you know a bit about engineering from a practical point of view. If you want to get out of engineering into another field, do try working at the bottom end for a while first. In fact many of those management trainee schemes require it. It doesn't matter what business you're in, the most successful managers are those who understand the nuts and bolts.
Then there's so many of those MBA's who believe that every business can be run just by manipulating the financial numbers, but that's another story. Bean counters know the price of everything but the value of nothing...
Whatever you do, don't become a bean-counter.