Avionics Master Switches

If your aircraft was built before the late 1970s, the factory probably didn't include an avionics master switch. But if you've upgraded your panel to modern solid-state radios, you really need one maybe even two. There are several different kinds, and AVweb's avionics guru explains how they work, how they fail, what they cost, and why you'd be foolish not put one in.

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