(2) CSU-3100 RCPN 822-1363-002, CSU-4000 RCPN 822-0049-002, or CSU-4100 RCPN 822-1364-002. Note 1 to paragraph (c) of this AD: To determine the CSU and FMC unit RCPN, refer to the aircraft manufacturer or applicable STC holder maintenance instructions for accessing them. (d) Subject.