I’m not sure where to post this one- it’s kind of arcane, so here it goes: Today while riding in my flight schools 1973 Cherokee 140 while it was towed to the pumps I started playing with the clock. In all my time flying I admit having never looked at, nor bothered to tinker with the original clock installed on the instrument panel of any plane I flew, it was truly an after thought. I either used the timer built into the Garmin transponder, the GPS, or a good, ol’ fashion wristwatch. So, is the clock electrically powered in an old Cherokee? And if so, does it draw current even when the master switch is off? The Cherokee Cruiser POH didn’t say a thing about it, and the electrical system diagram doesn’t have every circuit posted, so I didn’t see it there either. Curiously, the knob on the clock seemed to click, like I was winding a spring, when I turned it (it turned out you had to pull the knob out to set the time). So is it an old fashion mechanical clock? I did wind it up and the second hand started ticking. Either way, the time I set while sitting in the plane with the master switch off held as I flew, which was actually more convenient than I ever thought. So, how does the standard-issue, panel-mounted clock work on the garden variety Cessna or Piper?