Id like to hear from an avionics pro if we have one; old guy/gal so much the better. I have an RT 553 in the plane. I KNOW it has a do not transmit order, I saw that codified somewhere. But does it have a do not repair order that would put your license in jeopardy? No worries, the plane has a fully functional GNC 250 & Jep skybound subsciption. So the Edo is basically a boat anchor, except the nav receiver & VOR/Loc components actually work - sort of. It tends to flag off for no reason, although I can resurrect it by toggling up or down a few hundred Hz.