Quote:
Originally Posted by Beer30?
...I'm not familiar with the cruise power LOP mag check. Can you elaborate...
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Sure,
The end of runway mag check is not much of a test - anything but a gross ignition failure is going to show up as "good". OTOH, high altitude, LOP operations are challenging for ignitions. Just getting the fire lit at all is tough for some magnetos. The fact that EI's do this job better than magnetos does not mean they aren't getting a workout. So to see if they are both actually healthy, simply do a conventional "mag check" when established in your normal cruise power setting. For me, that's ~ 8,000 feet, 50 LOP. On the ground, my "mag check" produces zero RPM change between ignitions, so I have to look for the EGT rise to verify that one ignition is in fact shut down. If my ignitions are healthy, the cruise LOP method delivers the same result. I started doing this after a plug change once and discovered a weak coil. Worked fine on the ground, worked fine on ROP climb, but once I went LOP, the one side just couldn't hack it. Now, this is my normal cruise checklist item.
EDIT: someone beat me to the punch....