Hello,

Our Aviation Air Explorer Scout program has a C-172 M 1974 model. I am a CFI with the group and today during run-up did the traditional mag check. During runup the left mag small drop nothing unusual. Though, when we do 2 clicks left and check the RIGHT MAG (Serious engine roughness) and large decrese in RPM. Any thoughts, that can help me to discuss with our A&P/IA during normal hrs. on Monday? Do you think it is a bad set of mags or just one? I know every 500hrs they are to be inspected and/or overhauled.

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THANKS