Ignition switch settings

On Mar 3, 5:11 pm, "Travis Marlatte"
wrote:

I don't get the connection. Why would the licenced pilot need to know which
mag and which set of plugs is firing on Left or Right key position? Know why
the mag check is important and what to watch for during the mag check, yes.

Here's one reason (and this scenario initiated the post
in the first place). My 182 failed the run-up yesterday
on the "left" mag. I knew which cylinder it was through
my JPI. But which plug? The upper plug is easy to check, but
the lower requires removal of the lower cowling, which is
a 2-person job to replace.