Hi,
I am aware the vnav is not fully functional but I have no clue to which extent it’s working. Here is example:
1. Sometimes when I approach TD nothing happens. Vnav fully on, autopilot on, altitude set to lower. Descent path indicator stays solid in centerline, nothing happens. So I trigger manual descent and all of a sudden vnav “clicks in” and shows me that I’m above my vnav path, much above it.
2. When descent works ok, all of a sudden sometimes it looses the path. It shows that I am on correct descent path and in split second it messes up and either tells me I am much above or much below. It happened few times already.
Tom