What was found
DIAGNOSTICS REPORTS THE NR 1 ENGINE HAS EXPERIENCED A SUDDEN INCREASE IN LOW PRESSURE ROTOR VIBRATION LEVELS. PEAKING AT 2.56 UNITS DURING CLIMB. VIBRATION LEVELS PRIOR TO INCREASE WERE STABLE AT 0.6 UNITS. ACFT GROUNDED. ACCOMPLISHED AMM TASK 71-00-00-800-806-F00, TABLE 202, PARA 4B AND AMM TASK 77-31-00-970-803-F00, PARA G. DATA ON AAVM FOR NR 1 ENGINE ON THE LAST 10 FLTS, COPIED AND SENT TO POWERPLANT TECH SERVICES. TSR ACCOMPLISHED, PERFORMED FAN LUBE IAW TASK CARD 78472002. ACCOMPLISHED TEST 7 VIBRATION SURVEY REF TASK CARD 78472002. NR 1 ENGINE PEAK OBSERVED VIBE WAS 1.2 UNITS AT 60 PERCENT -70 PERCENT N1 RANGE, ALL OTHER POWER SETTINGS BELOW 1 UNIT.