I have been practicing several approaches and missed approaches, some with rejected landings from 50' today, and I have noticed a strange but consistent behavior with respect to FD modes.If below 400', you cannot engage a lateral FD mode. Passing 400', I select LNAV with the vertical mode still in TOGA. When it comes time to accelerate and clean up, I select LVL CHG which post the MCP SPD in the FMA. When I press LVL CHG, the lateral FD mode switches from LNAV to HDG! I have seen this happen several times now to the point where I can say that it's consistently happening. Has anyone else seen this occur?I don't believe that selecting a vertical mode like LVL CHG on a go-around should change the lateral mode from LNAV to HDG. However, I'm not familar with the NG to say that this is the correct behavior. I have not found anything the FCOM or FCTM that indicates that this behavior is normal.On missed approach using LNAV guidance, you need to be mindful of lateral mode changes when selecting your first vertical mode change from TOGA.Any thoughts?Thanks,Rich BollWichita KS

Edited January 29, 201214 yr by richjb2

Hi,Doesn't sound right to me. Refer to NGX FCOM Vol. 2, page 4.20.26 (PDF Page 238).Best regards,Robin.