25 BB. Appendix A
Appendix A.
Initial SIG Parameters and Starting Values Hard Parameters.
5. An international duty period shall not be constructed in excess of 7+35 block hours without at least three airmen on board (e.g., DC-10 standard crew, MD-11 with RFO).
CBA says Bid Pack Construction. Not sure if it makes any difference if build as a X-pairing after the fact.