Hello,

Been enjoying flying the TriStar but it seems that every time I select IAS and MACH on the pitch mode selector during a climb, the autopilot/FD initially holds the desired speed but then pitches down, causing the the aircraft to accelerate past the speed target and overspeed if I don't intervene with V/S. Over two flights this seems to have happened consistently in both IAS and MACH hold modes. At this point it seems that V/S is the only appropriate vertical mode that can be used for a climb - I can't imagine that this is realistic at all. Has anyone else experienced this?

I have had success climbing in VNAV to a preset altitude with TM activated when the PMS has been fully set up.

Hello,

I do understand that flying the aircraft in TM/VNAV could work around the issue, I’d still want the aircraft to function properly in a speed hold mode if I want to manage the climb manually, especially when I’m flying a departure procedure that has multiple altitude and speed constraints that (to my knowledge) the PMS can’t take into account. Even then, there seems to be a bug where the TM A/T mode commands idle thrust without the AP engaged which many on this forum have already reported it seems.

Thanks, with 1.0.3 we have made changes to the AP controller, but only added this to "VNAV" for now. We are working to implement the same logic into IAS/MACH modes as well for future update.

If you have any additional feedback meanwhile, specifically to how AP behaves with TM/VNAV , please let us know.

On 4/25/2026 at 8:01 PM, SteamingSpoon said:

Even then, there seems to be a bug where the TM A/T mode commands idle thrust without the AP engaged which many on this forum have already reported it seems.

Yes, see the post attached below. We're investigating the following:

Quote

While it is correct that TM mode requires FD+AP, we'll have another look at what it should do when conditions are not met (i.e. just disengage TM instead of commanding EPR 000/IDLE thrust).