Mag Check in Flight

Earlier in this thread I stated that my IA specifically told me to perform an in-flight mag check. The rest of the story is that he told me to do this because I was starting to get RPM fluxuation at 5000'. So, he asked me to go up to 5000' and perform the mag check and see what resulted.

Don't know if or how this additional info helps, but I wanted to clarify my circumstances.

Cheers,

Keven
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LovelyWendie99