As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THREE TEETH SHEARED OFF ON RIGHT MAG SIDE. TWO TEETH SHEARED OFF ON LEFT MAG SIDE. RIGHT MAG WAS NOT ROTATING. ENGINE RUNNING ON LT MAG ONLY. ONE MORE TOOTH SHEARING ON LT MAG WOULD HAVE RESULTED IN ENGINE SHUT DOWN. LOOKS AS IF TEETH FROM RT GEAR STUCK IN DRIVE GEAR AND POSSIBLY CAUSED TEETH TO SHEAR ON LT MAG ALSO. (POOR MAG DESIGN.)