FAA 2023-01-04

Requires inspection of certain part-numbered tail rotor head spider pitch change units for correct installation of the spider pitch change nut; marking a two- to five-millimeter wide black paint index mark and repetitively inspecting the alignment of the marking; and any necessary additional inspections and corrective actions. This AD also allows an affected part to be installed on a helicopter if certain requirements are met. Prompted by an occurrence reported where, during an inspection of a tail rotor head pitch change spider, excessive play and wear were detected.