RELEASE NOTES Sim Update 4 Beta - 1.6.25.0

If you are playing on PC, outdated packages in your community folder may have an unexpected impact on the title’s performance and behavior.

If you suffer from stability issues or long loading times, move your community package(s) to another folder before relaunching the title.

Stability & Performance

• Fixed a rare crash when selecting icon on the worldmap

General Bug Fixes

• Fixed a hang that can occurs when exiting a flight with a Wasm Aircraft

Install, Performance & Graphics

• Fixed broken clouds reprojection from 1.6.22

Aircraft

Boeing 737 MAX 8

• Fixed an issue where the autopilot would not follow the flight director when LNAV was not armed prior to takeoff and subsequently manually activated after takeoff.

Glass Cockpits

G1000 NXI

• Fixed an issue where the CRS knob did not change the selected OBS course when GPS OBS mode was active.

EFB

• In the Flight Planner app, fixed an issue where changing runway or procedure for an already selected airport in the route page would delete the selected parking location on the World Map or in a Career mission.
• In the Flight Planner app, fixed an issue where not enough fuel would be loaded with more complex fuel tank configurations.
• In the Flight Planner app, fixed an issue where max fuel capacity would be incorrect.
• In the Flight Planner app, fixed an issue where loading fuel or payload to 100% would sometimes not work.
• In the Flight Planner app, fixed an issue where the layout could shift when selecting a facility.
• In the Flight Planner app, fixed a map issue where airport identifiers would be cut off if longer than five characters in the search bar results.
• In the Flight Planner app, fixed a performance calculations issue where the vertical flight path would sometimes not start at the runway elevation.

Aircraft Tech

Model Behavior

• Fixed an issue causing the Asobo_AS307_Template ModelBehaviors template to create an approach button with a tooltip contains a state that does not match the current sim state.

Career

• Fixed an issue where changing departure procedure or runway from the mission briefing screen via the EFB could cause vehicles and aircraft to fly into the air when skipping to taxi
• Unlocked “Cargo Transport - Heavy” and “Cargo Transport - Super Heavy” career specializations

General Bug Fixes

• Fixed an issue where missions would allow aircraft to take off or land in airports too close to their altitude ceiling
• Fixed back on track deactivated during shutdown phase

World

• Fixed loading sometimes ends before the terrain and buildings are properly loaded

SDK

SimConnect

• Fixed random crash when Data Definitions are cleared while existing requests reference it

Edited November 14, 2025Nov 14 by Blueline308

Too scared to try the Beta so waiting for the release.. but always enjoy hearing how things are progressing performance wise...

Great!!!! Getting my FDX 777F ready for flight from KMEM to MMUN. Transporting MEM BBQ to the southern boarder for some good taco and burrito eats.

It downloaded and installed fine (via MS Store).  Flew my ususal 45 min test flight and it flew fine and everything worked as expected.  No CTD.  ATC is still silly.

What do the clouds look like now?

1 minute ago, vonduck said:

Too scared to try the Beta so waiting for the release.. but always enjoy hearing how things are progressing performance wise...

Beta has been running very well. I'm glad to be able to test and figure what needs to be done to get flight off the ground. As in RW nothing works as expected.

Everytime that I see a new changelog, I jump to see if the black lines over the water has been fixed... no luck yet

Took the Fenix for a quick spin EGNM to EGLL and smooth as silk (again). very promising. FWIW not that it would have applied to this specefic trip but I have never seen/noticed any black lines over water. 

Great performance, I think we're getting close to the final release. 

1 hour ago, Blueline308 said:

It downloaded and installed fine (via MS Store).  Flew my ususal 45 min test flight and it flew fine and everything worked as expected.  No CTD.  ATC is still silly.

Surely all they need to do is to implement the msfs2020 version of ATC.  At least it worked, even though it had its faults.

Maybe it's been shelved until 2028 to try to make us buy the next version of msfs.  It doesn't ever seem to come out very high on their list of priorities, does it.

15 minutes ago, cianpars said:

It doesn't ever seem to come out very high on their list of priorities, does it.

It does not.  I don't think it will ever be good.  Even the pay to play ATC add-ons are poor, IMO.

Apart from performance and night lighting, are there any obvious changes that SU3 users will immediately notice when SU4 does finally launch?

1 hour ago, cianpars said:

Surely all they need to do is to implement the msfs2020 version of ATC.  At least it worked, even though it had its faults.

Maybe it's been shelved until 2028 to try to make us buy the next version of msfs.  It doesn't ever seem to come out very high on their list of priorities, does it.

If AI ATC was good we would see it in real world. Instead all we have is a shortage of ATC humans lol

18 minutes ago, scotchegg said:

Apart from performance and night lighting, are there any obvious changes that SU3 users will immediately notice when SU4 does finally launch?

Yes the change log will be long.. but let me tell you, it’s not just “performance” as in the fps in the flights are much better (which is true).. it’s the whole entire experience using the software. Every single thing is faster - moving around menus, zooming into the world map, loading, choosing planes.. everything. 
 

that’s what really makes this such a massive release. In fact, I’d go so far as to say that SU4 will be the best SU since I started as a Tech Alpha insider in 2019. 
 

Before the negative chaps chime in - yea I know there are various things still buggy, I’m not saying everything is perfect. But the performance gains are truly massive across the board. 

13 minutes ago, JonathanC said:

But the performance gains are truly massive across the board.

Good to know the gains are so wide ranging.