On Mar 3, 11:09 am, "Tony Cox" wrote:
Here's a question that until yesterday I'd have thought was
obvious.

Cessna-style (and no doubt other) ignition switches have five
settings -- Off/Right/Left/Both/Start. When you're on the "Right"
setting, does it mean you are firing on the right magneto or
does it mean the right magneto is grounded?

Very good question. If we use the logic that "Both" means both magneto
circuits are open, and "Off" means both magneto circuits are closed,
that would imply that "Right" means the right magneto is open (and
hence firing).

But I am sure an A&P should be able to give a more authoritative
answer.