What was found
NR 2 ENGINE VIBRATION INDICATE BETWEEN 1.9-2.0 AT 84-97 N1 CAUSING AN AUDIBLE AND TACTILE VIBRATION. VARYING THE RPM WILL CAUSE THE AUDIBLE AND TACTILE VIBRATION TO INCREASE FOR A PERIOD AND THEN SETTLE DOWN TO A LESSER VALUE. PERFORMED ONBOARD FAN TRIM BALANCE PROCEDURE IAW MM 71-00-00-750. WEIGHTS AT HOLE POSITIONS NR 17 & NR 21 ARE P11. NR 21, NR 22 & 23 ARE P13. ORIGINAL WEIGHTS AT HOLES NR 15, NR 18 & NR 19 REPLACED WITH P14S AND NR 21 REMAINED THE SAME. VIBRATION LEVELS BELOW 1.0.