wrote:

I guess I don't completely understand your (or Marty's) reluctance to
at least check the mags in flight.

On a Lycoming, each mag controls half the plugs on the top and half on the
bottom. There are a variety of problems that will lead to fouling of the lower
plugs. If I start switching mags on an iced up engine, there's a good chance it
will die. There's also a pretty good chance that it won't restart when I switch
back to both. Especially on a carburetted engine, you run a big risk of flooding
the engine while it's windmilling. As long as the engine's running, I won't take
a chance on switching mags. It's just something I'm not prepared to do.

George Patterson
There's plenty of room for all of God's creatures. Right next to the
mashed potatoes.