Ha, it's a good question. I went to YouTube (as I follow a couple of incident analysis-giving pilots, "MentourPilot" and "74 Gear"). Anyway, there were intere

Ha, it's a good question. I went to YouTube (as I follow a couple of incident analysis-giving pilots, "MentourPilot" and "74 Gear"). Anyway, there were interesting reports from a couple of Emirates 777 flights which appear to have the same issue [[1], [2], pilots zero-ing altitude on autopilot control {MCP}], but it doesn't look like the OP's issue; it's low-trajectory, not diving. There was also a stall on take off [3] which might correlate with the issue here?? Also, of course, there's compressor stalls which I gather are usually bird strikes? Certainly not enough information to make any judgement on cause. No doubt there will be reports out in due time. [1] https://www.youtube.com/watch?v=F7Mbw0vVcS0 https://www.youtube.com/watch?v=F7Mbw0vVcS0 [2] https://www.youtube.com/watch?v=23fiDj8Uy6Q https://www.youtube.com/watch?v=23fiDj8Uy6Q [3] https://www.youtube.com/watch?v=SO3xmzoLzfI https://www.youtube.com/watch?v=SO3xmzoLzfI