Nose up and down
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It looks like for the majority of that video, the aircraft is below VFTO speed with Flap 0 and stalling.
With the autopilot engaged, but with no vertical modes selected on MCP, the aircraft remains in basic PITCH mode and retains the initial pitch angle at the time of engagement. In PITCH mode, the pitch can be adjusted either via the PITCH control on the autopilot controller on the aft pedestal or via the autopilot SYNC function.
In the video, there are instances where the autopilot is engaged with a pitch angle of 15 degrees, which is rather excessive for the aircraft when at high weights and with one engine at idle.
When a stall is sensed, the aircraft's protections start kicking in, which include the autopilot disconnect, stick shaker and stick pusher, which can be seen in the video.
If you're new to the 146, the aircraft is quite a quirky in how it operates compared to more modern aircraft, so we'd recommend having a run through of the tutorial flight from page 182 of the 146 Professional Operations Manual: https://support.justflight.com/en/support/solutions/articles/17000134438-146-professional-msfs-manuals
We also have tutorial videos on our YouTube channel covering the tutorial flight: https://youtu.be/bFV_Zg86h-k?si=IL1hLqzLk3uBwdbs
Mark - Just Flight
