HUD symbols move at wrong rate when adjusting altitude hold with trim switch

[Machalot]

When altitude hold autopilot is engaged, the altitude can be adjusted using the trim switch up and down. The reference symbology on the HUD slides up and down when the trim switch is held, but it moves much faster than the altitude reference value tracked by the autopilot. So after releasing the trim switch, the autopilot holds the new reference altitude, but the HUD symbols are aligned to a much different altitude. Pressing the Reference button or momentarily turning the autopilot off and back on with realign the HUD symbols with the current altitude. 

I'm posting on my phone so I don't have a track at the moment. It's easy to reproduce, but if a track is requested I can make one tonight. 

Edited November 4, 2021 by Machalot

[IronMike]

Thank you, tracked!

[TOViper]

On 11/3/2021 at 8:05 PM, Machalot said:

When altitude hold autopilot is engaged, the altitude can be adjusted using the trim switch up and down. The reference symbology on the HUD slides up and down when the trim switch is held, but it moves much faster than the altitude reference value tracked by the autopilot. So after releasing the trim switch, the autopilot holds the new reference altitude, but the HUD symbols are aligned to a much different altitude. Pressing the Reference button or momentarily turning the autopilot off and back on with realign the HUD symbols with the current altitude. 

I'm posting on my phone so I don't have a track at the moment. It's easy to reproduce, but if a track is requested I can make one tonight. 

 

Hey Machalot!
I am not able to reproduce this, can you create a video?

Edited November 25, 2021 by TOViper

[Machalot]

13 hours ago, TOViper said:

Hey Machalot!
I am not able to reproduce this, can you create a video?

 

Well, now I can't reproduce it either.  I noticed this issue probably almost a year ago, and just finally got around to reporting it.  I definitely observed it the night that I reported it.  My HUD reference lines would slew up and down very fast when I used the trim switch while in altitude hold. 

But now when I tested it tonight, they move at a very slow rate and the aircraft follows them to the correct altitude.  I wonder if the most recent patch affected something, or who knows.

Edited November 26, 2021 by Machalot

[TOViper]

6 hours ago, Machalot said:

I wonder if the most recent patch affected something, or who knows.

To be honest, I guess so, but I indeed remember seeing this effect once too, but wasn't able to reproduce it with the current OB 2.7.8.16140.
I will fly the Viggen a bit this weekend, maybe I will catch it again, or - hopefully - don't catch it anymore.