Microsoft/Inibuilds NAMC YS-11 for MSFS2020

 

Description: While flying the NAMC YS-11 , I’ve consistently observed a wing-low attitude during cruise when the autopilot is engaged. The aircraft flies wings-level manually, and fuel trim gauges confirm balanced fuel distribution. CG is within limits, as flight plans are generated via Simbrief.

I’ve tested both HDG and NAV modes—no difference. Applying aileron trim temporarily corrects the roll, but the autopilot soon overrides and reverts to the wing-low attitude. This behavior mirrors an issue I experienced years ago with Just Flight’s BAE 146, which was never fully explained and didn’t appear to be widely reported.

Troubleshooting Steps Taken:

• Verified fuel and CG balance

• Disengaged autopilot to confirm manual wings-level flight

• Tested multiple autopilot modes

• Applied aileron trim (temporarily effective)

• Compared behavior with other aircraft (no issue observed)

Suspected Cause: Possibly related to autopilot roll channel logic, servo calibration, or attitude reference modeling. May also stem from how legacy aircraft autopilots are simulated or simplified in the platform.

Request: Has anyone else experienced this behavior in the YS-11 or similar aircraft? Are there known fixes, config tweaks, or patches that address autopilot-induced roll bias? Would appreciate any insights or suggestions.

I've noticed excessive nose-low at altitudes below FL190/200 in which it tapers off more towards normal at and above those listed, and some laziness on behalf of lateral autopilot response but not wing-low cruising unless there is a strong quartering or cross-wind. I didn't note that it was specific to autopilot engagement vs hand flying. Have you reported it on the inibuilds forms and/or discord and has the team said anything there? I am not sure if they monitor Avsim at all. 

Edited October 6, 2025Oct 6 by STK

Thanks, have posted on Inibuilds as well, waiting for any replies.