Originally Posted by
lurkio
I've accidentally caught the on/off switch once or twice. Never actually turned the box off but I would imagine it can be done.
Frequency transfer pushbutton at no. 2, the on/off switch is at no. 9.
Early in my career we didn't have those dual tuning heads. When we got them (and were so pleased with them) fingers stayed away from them, not unlike a lot of flight deck discipline, like not shutting off the fuel to an engine. Those levers/switches are there for the very careless.