Sim Update 3 Beta (1.5.4.0) Release Notes - May 29, 2025

We are continuing to investigate stability/crash issues reported by the community on Sim Update 3 beta. Please note these issues have not been resolved in 1.5.4.0 and will be addressed in a future Sim Update 3 flighting update.

Thank you for your patience and feedback!

-The Microsoft Flight Simulator Team

RELEASE NOTES Sim Update 3 Beta - 1.5.4.0

If you are playing on PC, outdated packages in your community folder may have an unexpected impact on the title’s performance and behavior.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 crash occuring in the model behavior parser when cancelling a request (rapidly clicking tiles in the aircraft selector)

General Bug Fixes

  • Allowed the player to lock their input presets
  • Changed new plane flares on interior lights to be disabled by default.
  • Fixed potential crash when ATC attempts to look for appropriate STAR to assign for clearance

Backwards Compatibility Bug Fixes

  • Fixed UV length not being computed correctly when glTF geometry is reused (avoids blurry textures from models coming from 2020 packages)

Aircraft

  • Fixed crash in ObjectFollowGraphAI when a NavigationGraphNode is destroyed before ai or AI destroyed before the node
  • Modified WaitForPilotAndCopilot to create a “mandatory” procedural character

Air Tractor AT-802

  • Fixed an issue causing some circuit breakers to not properly affect the windshield wipers and their associated lights.

DG Aviation DG-1001E

  • Fixed an issue causing the landing gear keybinds of the DG1001 not to work when they were using up/down keys instead of toggle
  • Fixed an issue causing the DG1001’s tow cable to become unreleasable if it was already released by the tow plane

Diamond DA62

  • Fixed the thumbnails for all variations

Aircraft Core Systems

Fuel System

  • Fixed an issue that prevented gravity based fuel transfers in some cases.

Physics

  • Updated the “Debug Aircraft Weight” tool to perform the same validation checks on MOI as during aircraft mass properties loading.
  • Downgraded log level for MOI validation issues during aircraft loading from “errors” to “warnings”.

Aircraft Tech

Modular Aircraft

  • Fixed withExterior_showInterior_hideFirstLod hiding the entire interior of modular aircraft if interior model was an empty model. Instead this option will hide the first LOD of all interior models of the aircraft hierarchy, except for these empty models.

Career

General Bug Fixes

  • Fixed refuel to full capacity not working in freelancer mode

Missions

Aerial Construction (Rotorcraft)

  • Added condition to prevent pickup while landed

Search & Rescue - Hoist (Rotorcraft)

  • Fixed several visual issues on back on track during search and rescue hoist mission

Online Services

Weather

  • Fixed an issue where the clouds on the world map did not transition correctly after a data update
  • Improved thunderstorm prediction

Streaming

  • Fixed the game freezing when attempting to stream some packages, due to sound.xml being in a folder which name did not start with “sound.”

Virtual Reality

  • Fixed missing icons for some VR controllers inputs
  • Fixed the toolbar that sometimes disappeared when leaving the VR mode

DevMode

Scenery Editor

  • Fixed crash when undoing a “replace with SPC”

Visual Effects Editor

  • Fixed crash when using VFX spawner after cloning a VFX & improved cloning process

SDK

WASM API

  • Fixed deferred events not properly copying their arguments in a multithreaded context (fixes execute_calculator_code not correctly triggering multiple events specified through one single string)

Exporter Blender

  • Fixed enable new layer children and update parent layers
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