What was found
WHILE IN LEVEL CRUISE AT 14,000 FT WITH THE AUTOPILOT ENGAGED & DOING APPROX 300 KN, A LARGE VIBRATION FELT IN FLOORBOARDS & COULD HEAR IT. PERFORMED ENG TREND DOWNLOADS. PERFORMED ENG RUN & NO DEFECTS & VIB LEVELS OF .16 IPS AT HIGHEST. INSPECTED AGB PLUGS, INSPECTED RT ENG FAN BLADES, & ACCESSORIES, GEARBOX MOUNTS, & LINKAGES, NO DEFECTS. PERFORMED POWER RUNS, DURING RUNS, RT ENG VIBE IPS J\1 ND HIGHER THAN .16, & LH AT .17. PERFORMED 2ND ENG TREND DOWNLOAD, MANUFACTURER RECOMMENDS FLY ACFT, NO ISSUE WITH ENGS. SWAPPED LT & RT ENG GENS, GENS OPS CHKD GOOD IAW 24-31-05. PERFORMED FLNAL TO POWER RUN WITH SWAPPED GENS & SAME LEVELS OF VIBES, .17 IPS LT & .18 IPS RT. CHKD GOOD, NO DEFECTS.