With one of my friend, we are make flight from Paris (Orly) to La Havana. This a long flight (10 hours). During this flight we have make few tests, and the general problem is the synchronization.
Indeed, the MCDU is not possible to use both when one of guy use it, it's shame. Flight directors are not good placed for the PM (sometimes) , the FOB is different (we made sure to left Orly with the same level of fuel, and the weather engine is the same (ActiveSky for P3Dv4). And the MCP. For my friend the altitude is too high and the speed is faster.
That's all, the pushba