Hey folks,

First of all, the TBM is my number one plane to fly at the moment. Really enjoyable!

But i get the impression that the Autopilot is having a hard time centering on the Navtrack. Especially after turning from on point to the next it feels like it takes forever to be centered. I keeps oscillating left and right for almost 20 NM until it finally aligns correctly.

Additional to that the AP is always too low on the glidepath. The only way for me to make him keep the right GS is to do a Flaps 1 approach with higher airspeed.

 

Can someone share his experience with this?

 

Best regards,

Tom

 

PS.: I remember it was possible to edit the AP files for a little tuning. Might this be the case in MSFS too?

I'm also seeing these oscillations from left to right, although they seem to be most pronounced when using time compression.

Glidepath on ILS approaches seemed pretty much right for me, at around 80 knots with gear down and flaps fully deployed, it brought me down to the threshold with half white / half red PAPI lights.

Edited September 3, 20205 yr by Der Zeitgeist

@ThomseN_inc

I think the amount of waypoint oscillation you get might be dependent upon how big the turn needs to be when transitioning to the new waypoint. I havent done a ton of flying yet in the tbm and so far while ive noticed a little oscillation it hasnt been terrible, but thats likely because the waypoints where i tend to have the a/p on is only during cruise phase which means they are mostly aligned with mostly shallow type turns. Much of the time right now im flying manually.

My friend reported that his tbm a/p actually missed a waypoint entirely, but I have no yet experienced this myself. I've tried a few approaches with it and from what I can recall some of the g/s's were fine, and some were too low. I think the Rnav wLPV guidance are sometimes set too low...but the ILS's tend to be ok. I've been assuming that the LPV g/s being low sometimes has to do with the nav data itself and not the instruments in the plane. The nav data being used seems pretty bad/old/inaccurate.

 

Edited September 3, 20205 yr by hangar

25 minutes ago, hangar said:

I think the amount of waypoint oscillation you get might be dependent upon how big the turn needs to be when transitioning to the new waypoint.

I tried to center myself by using the HDG and then activate the NAV mode. As soon as i hit NAV, the AP veers to one side and starts oscillating.

My impression is that when following a NAV track the AP starts to turn way too late and its almost overshooting the next XTrack.

I've now done many flights with the TBM 930 and don't have these issues. The lateral guidance modes work as well as can be expected from an unpatched default plane; vnav doesn't work. Altitudes are captured smoothly. The one bug is that once you load and activate

an approach the plane does a 360 before following the approach. However, it does follow the approach correctly. No glide path issues if and when you manage your speed correctly. I do a full flaps approach and am 85 over the fence. 

There are now plenty of youtube videos that show how to fly an ILS approach correctly. 

Edited September 3, 20205 yr by Ricardo41

2 minutes ago, Ricardo41 said:

I've now done many flights with the TBM 930 and don't have these issues. The lateral guidance modes work as well as can be expected from an unpatched default plane; vnav doesn't work. Altitudes are captured smoothly. The one bug is that once you load and activate

an approach the plane does a 360 before following the approach. However, it does follow the approach correctly. No glide path issues if and when you manage your speed correctly. I do a full flaps approach and am 85 over the fence. 

There are now plenty of youtube videos that show how to fly an ILS approach correctly. 

Yeah, i know how to do fly an ILS as i am doing that in RL but i am no TBM driver so i tried different setups and the results did vary. To me it seems that the AP in general is a slow responder when it comes to correcting things.

I too had the issue with activation of the approach and i have found a workaround which works for me.

If your routing ends at XYZ and the STAR/Approach starts at XYZ i leave the last Waypoint of the route out and use the first waypoint of the approach instead.

For example:

If my route ends like this

BASUM T820 PIXUR STAR EDDW

And PIXUR is also the first WP of the STAR, i plan to the WP before PIXUR instead as PIXUR will be added with the STAR.

Doing this seems to work preventing the AP turn around.

 

21 minutes ago, Ricardo41 said:

There are now plenty of youtube videos that show how to fly an ILS approach correctly. 

I've seen those and they are not very "honest" in making it because they like the clicks, and I'm being nice in my description. Until the Activate Vectors on Final is fixed it will not be the correct way.

58 minutes ago, Ricardo41 said:

The one bug is that once you load and activate an approach the plane does a 360 before following the approach.

  WOW, I guess if you are only going to have "one" bug, might as well make it a "good one".  LOL.

Al

Edited September 3, 20205 yr by ark

Share your experience with the autopilot...

Edited September 3, 20205 yr by Chock

39 minutes ago, FPStewy said:

I've seen those and they are not very "honest" in making it because they like the clicks, and I'm being nice in my description. Until the Activate Vectors on Final is fixed it will not be the correct way.

You'll be waiting a long time for that fix. 

41 minutes ago, Chock said:

Share your experience with the autopilot...

Is that the new GBAS approach with continous descent profile i have heard of recently?

LOL -43485 VS

20 hours ago, hangar said:

@ThomseN_inc

I think the amount of waypoint oscillation you get might be dependent upon how big the turn needs to be when transitioning to the new waypoint. I havent done a ton of flying yet in the tbm and so far while ive noticed a little oscillation it hasnt been terrible, but thats likely because the waypoints where i tend to have the a/p on is only during cruise phase which means they are mostly aligned with mostly shallow type turns. Much of the time right now im flying manually.

My friend reported that his tbm a/p actually missed a waypoint entirely, but I have no yet experienced this myself. I've tried a few approaches with it and from what I can recall some of the g/s's were fine, and some were too low. I think the Rnav wLPV guidance are sometimes set too low...but the ILS's tend to be ok. I've been assuming that the LPV g/s being low sometimes has to do with the nav data itself and not the instruments in the plane. The nav data being used seems pretty bad/old/inaccurate.

 

The Autopilots really need some tuning work.  They are in constant oscillation.