Good Morning Guys,

I fly a Super ES with a new IO-550N.  Recently I noticed a squeeling sound coming from the engine when I shut it down.  After trying several ways to duplicate the sound, I noticed that when I hand turn the prop, I hear the sound just before the mags click so I assume it is coming from the mag.  I have never heard this sound on any other airplane.  Does anyone know if this is OK or does the mag require service or lubrication?

Chat Daniel
Super ES
N891AC

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