What was found
LT MAGNETO SEVERE MISS AND INTERMITTENT, INOPERATIVE IN FLIGHT. SB'S 02-08A AND 03-08A C/W THROUGH INSP. LT MAGNETO, SLICK MODEL 6364, SN 06121363 WITH 356 TOTAL HOURS. FUNCTIONAL CHECK ON GROUND CHECK GOOD BEFORE AND AFTER FLIGHT. INSP REVEALED CAPACITOR, CAP AND ROTOR DEFECTIVE. CAPACITOR PN K3984 FAILED AT REAR LEAD, DISTRIBUTOR BLOCK AND ROTOR ASSY PN K3823. ROTOR END BURNED, CAP/BLOCK ASSY HAS DEEP GOUGES AND UNEVEN SPARK PATTERN AROUND CONTACTS CREATING PITTING AND FANNING OF THE ELECTRICAL CURRENT.