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Old 4th Aug 2011, 10:10
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Selected vertical speed?

Can anyone explain this?

The vertical speed trace, left of the blue line (A/P drop off).
Vert. Speed seems to be compensated by the Selected Vert. Speed at regular intervals to keep it at altitude.
@ ~02:10:10 the zoom climb starts (no more compensation of the automation).
@ ~ 02:10:20 there's a sudden peak up, down and up again.

- Who's generating this compensation in NORMAL
- Is that normal system behaviour or was the A/C unstable before the event?
- What could introduce the peaks at ~02:10:20?

Thanks in advance for answering the questions.
A33Zab is offline