What was found
ON CLIMB-OUT FROM AVB TO AAB - NR 1 ENGINE RPM FLUCTUATED FROM 105 PERCENT TO 95 PERCENT IN LESS THAN ONE SECOND, NO LOW OIL LIGHT AND MECHANICAL GOVERNING HAD NO EFFECT ON CONDITION, SHUT DOWN NR 1 ENGINE AS PRECAUTIONARY, AIRCRAFT LANDED SAFELY AT AAB. FOUND NR 1 VALVE HOUSING HAD BAD BEARING, REPLACED VALVE HOUSING AND PERFORMED ENGINE RUN, OPS CHECKED GOOD PER J/C 7101, 7101-2, 6101-1, AND 6103. (M)