Long time ago ('82). As best I can remember, slightly unusual EGT readings
and maybe a slight roughness (Continental O-470). The next time I was
directly over an airport I reduced power and did a mag check (at 9000 feet).
One mag was dead. I switched back to both and announced that we would be
landing at that airport, where the spring got replaced.

Another time, after a fuel stop, in doing the runup, one mag was dead. That
turned out to be a defectively manufactured Bendix capacitor (terminal
crimped over insulation) that had worked for almost a year. Later, that day
in talking with my daughter (who was 10, then, and had been riding in the
right front seat on the previous leg), she mentioned that she had noticed
some slight roughness in the flight leg that preceded the failed mag check.
I agreed with her. Apparently, it had not not been pronounced enough to
lead me to do another one of those "enroute" mag checks.

"JJS" jschneider@remove socks cebridge.net wrote in message
...

"DL" wrote in message
ink.net...
If the impulse coupler spring breaks, you have, at best, a dead mag. If
you don't notice the subtlety in flight (as I once did) you will notice
it as a dead mag on your next run-up.

May I ask how you detected a broken impulse coupler spring in flight, DL?
I might learn something here.


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