Magenta Line Jumping

[FlyerC3]

Hi

I was handflying the DKB4H SID from EDDS to DKB by following runway heading until crossing DKB radial 228 and turning then to 48° heading.

So far so good. A/T and FD ON, starting and climbing with TOGA and trying to follow the magenta elevation line. This line however sometimes jumped all of a sudden from about 8° to about 15° elevation and then slowly went back to below 10° und jumped again. Did this several times. What did I mess up here ? 

Has anyone else seen this before and a hint what I made wrong ?

And by the way : why is heading sel announced, since AP is off ?

Regards

Joachim

Edited September 23 by FlyerC3

[FlyerC3]

Ok, disregard, cannot reproduce this behaviour. I will watch it over the next flights 

[Litjan]

Hello Joachim,

It seems that you do not know how the Autopilot and Flight-Director system of the 737 (and all Boeing aircraft) works, and I can not explain it fully here in forum posts. I see you are still in TO/GA mode (you did not activate an appropriate vertical mode after taking off) and of course while using the Flight Director the same flight-mode-announcements are shown as if flying with the autopilot, the only difference is that the pilot is moving the controls, not the autopilot.

The vertical line "jumping" is normal take-off behavior, it is the way that the FlightDirector is coded...the pilot is not supposed to follow the flight-director until he has safely taken off.

I suggest reading and studying about how these systems and the flight mode annunciation works, there are also some good tutorial videos on what these do and how they are supposed to be operated.

If you fly without knowing how the systems work, you will have lots of questions about "unexplainable behavior".