15 S/N A-393 TSN 611.2 TO 1641. Installed 4 each new Bearings P/N 407.310-101-105 SIN LK1102, SIN LK11586, S/N LK11491, and S/N LK11887, 2 each new Pitch Horns P/N 407-010-103-113 S/N AZ-146 and S/N AZ-298, and new Lower Plate P/N 406.010-117-125 SIN AZ-165. Reinstalled serviceable M/R Hub Assembly S/N A-393