Problems with TO/GA and CMD A in tutorial

[nicobecker37 0]

Hi all, so here is my problem. In the tutorial after setting up FMC, MCP ect and ready to take off I follow step by step the instructions. When I advance the thrust leavers to about 40% I press the TO/GA button and what I notice is that in the MCP both VNAV and LNAV disangage. The consequence is (at least I think so) that once I take off, I can not engage the autopilot. The FMA are just as descirbed in the tutorial but i just cant engage the CMD A. What am I doing wrong?? Thanks for any advise. Nic

[Lusche 3]

did you try at 400agl and your inputs centered ?and vnav and lnav are still 'armed' when pressing the togo ... (vnav and lnav should be in white letters on your pfd)

[ga 1]

VNAV and LNAV is active on take off, but dissengane when, after takeoff of when trying to hit CMD........

[ajacied551 1]

You should set both F/D switches to ON and A/T switch to ARM, Then advance the Thrust levers and than push TO/GA, at 400 ft AGL you can engage the Autopilot to CMD.