Originally Posted by Altimeters
Because genius what else would you recommend selecting comm 2 to? A random CTAF frequency? Ohhh perhaps numbers?
It's simple, company policy states comm 1 active, comm 2 guard.
There is a counter view that, at least where instant communication with ATC is necessary ie Ground, Tower, Approach, and Departures, you monitor the active ATC freq on both radios.
That will 1/prevent you missing any critical ATC transmissions eg "Go Around", "Stop Immediately" if one of your VHFs fails and [cough cough] 2/prevent you being jammed by someone transmitting on Guard and missing any critical ATC transmissions...