Trim values saturate to limits after long flights on AP. PLANE CRASHES G LIMIT

Bug Reporting Hub Aircraft & Systems
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1

ISSUE DESCRIPTION

Description of the issue:

Trim values saturate to limits after long flights on AP. The AP autotrim seems to control a different trim value than the manual trim. After long flights of AP trimming, touching 1 key for trim increment or decrement instacrashes the plane because of G-limit. The trim goes to 100% or -100% instantly.

Can’t touch trim after using AP, its ridiculous.

If applicable, which aircraft is experiencing this issue:
208b. maybe others.

[PC Only] Did you remove all your community mods/add-ons? If yes, are you still experiencing the issue?
no mods.

FREQUENCY OF ISSUE

How often does this occur for you (Example: Just once, every time on sim load, intermittently)?

ALWAYS

REPRODUCTION STEPS

Please list clear steps you took in order to help our test team reproduce the same issue:

1.long flight
2.AP level flight
3.disconnet AP and touch manaul trim. bye bye.

YOUR SETTINGS

If the issue still occurs with no mods and add-ons, please continue to report your issue. If not, please move this post to the User Support Hub.

What peripherals are you using, if relevant:
none

[PC Only] Are you using Developer Mode or have you made any changes to it?

no

[PC, MSFS 2020 Only] Are you using DX11 or DX12?

[PC Only] What GPU (Graphics Card) do you use?

[PC Only] What other relevant PC specs can you share?

MEDIA

Please add a screenshot or video of the issue occurring.

[END OF FIRST USER REPORT]

:loudspeaker: For anyone who wants to contribute on this issue, Click on the button below to use this template:

Do you have the same issue if you follow the OP’s steps to reproduce it?
•

Provide extra information to complete the original description of the issue:
•

If relevant, provide additional screenshots/video:
•

2

If this is happening with the Turtle Beach VelocityOne yoke, there is a firmware update to fix it.

3

no peripherals, mouse and keyboard only. trim is all keyboard

4

This just happened to me on at the end of a C208 4 hour medevac run. It was kinda my fault for having the power too low on alt hold, thus forcing the Autopilot to trim up.
It’s something to check before coming off autopilot. Also the yoke position, which can get forgotten since it mostly hidden.
There’s an aircraft-specific keybind for ‘Elevator trim position neutral’ on the 208 and the 172 which will be useful.

2 Likes
5

I can confirm that I have encountered this bug multiple times, with two instances resulting in crashes. In one case, I was able to recover, and in two other instances, I managed to hit the escape key and restart the mission. It’s very frustrating to complete a multi-hour flight only to crash on short final. I was able to recover by engaging the autopilot, which helped return the trim to neutral.

1 Like
6

Something similar here, I have to constantly do small adjustments of the throttle on a 1h long C172 flight because the aircraft attitude/speed was constantly changing. Also what is considered a “long AP flight”? Like 2.5 hours +?

1 Like
7

Sometimes I have the same with the C172. It’s independently from the device. Same issue with joystick, mouse or others. This happens not only with AP. Also when you are in carrer mode and skip with ALT-N then the trimm wheel is doing crazy things

1 Like
8

thanks all for replying. good to know its not just my keyboard glitching. its crazy how such a simple variable like trim values end up being so out of phase between manual and AP counts.

Its a simple line of code that SHOULD ONLY read one and update the other by increments. absolute values should not be allowed in the flight model.

please fix this asobo.

9

your issue is a different issue. All the AP models on all planes are not tuned for good tracking. all planes wobble in AP. Different issue altogether. Someone at Asobo needs to sit down and tune the AP gains for each plane. It takes a bit of time but its not difficult. they just got so much to fix…

10

I don’t see that there is anything to fix.
Autopilots are not magic wands. If you ask the AP to hold altitude with inadequate power, all it can do is trim up. And of course this can result in hitting the limit. And if you just switch it off in this state you have to deal with the aircraft in that state.
It’s really an airmanship issue.
And the AP will wallow around following a course, perhaps excessively, especially the C208, and especially at low airspeeds. But again, just fly the plane and deal with it.

11

zero reading comprehension.

12

Do you have the same issue if you follow the OP’s steps to reproduce it?
• Yes

Provide extra information to complete the original description of the issue:
• I see this on numerous instruments in the Vision Jet, for both VelocityOne Flightstick and Mouse. Instruments that revert to max/min every time they’re clicked on include:
- Vertical Speed: starts at 9,900 ft/min and has to be scrolled down
- Trim Wheel: goes to 20 degrees whenever clicked with mouse, also goes to max with flightstick after AP is used
- MFD zoom: zooms all the way out on click and has to be zoomed in each time

It seems this “reset to min/max” issue persists across many instruments on an axis.

1 Like
13

I seem to have gotten around the trim issue (by changing settings on my flight stick and handing trim as up/down buttons instead of an axis), but I will note that the other instruments only do this for my in VR. I tested in flat and was not able to reproduce

14

i dont have axis trim, only yoke. i have trim under “increment/decrement” on keyboard. Weird that you only get it on axis!