Hi,Today I did a flight from Amsterdam to Paris with the 747 and when I was about halfway my suddently the VNAV disengaged and my FMC displayed the message: Unable crz alt, wich I think it means Unable cruize altitude. Does enybody knows how to enable the VNAV again and get that FMC message away.Toto Marchand.

Most likely your selected crz alt is overlapping onto the TOD point. You need at least one minute at crz for it to work, in other words your crz altitude for that flight is too high. Option? Set the MCP to a lower altitude and set this into the FMC's crz alt line and press the alt knob to start your climb to your new crz altitude.[h4]Randy J. Smith[/h4]AMD 64 4000+|ASUS K8V DELUXE|SAPPHIRE ATI X800XT PE|MUNCHKIN 3200|80 gig SATA|DELL 1905FP 19" LCD|TRACKir PRO|PFC JEPPESEN MOONEY YOKE|CH PRO PEDALS|

Thanks, Randy!