
The Cowan Simulation
MSFS H125 Project
Changelog
MSFS H125 (AS350B3e) v3.2 – 10/03/25
Important Update Tip
Never overwrite the old version.
Instead:
-Delete or move the old folder out of your Community folder
-Then extract the new version into Community
This ensures a clean, trouble-free install. Thanks!
-Enhanced SAS/AP and Force Trim system
-Autopilot modes now require SAS to be engaged
-HeloSAS updated to use trim inputs instead of direct actuators, matching real-world operation
-Rewritten SAS/AP manual for improved clarity
-Fixed issue causing NAV mode to randomly disengage
-Fixed doors remaining open in multiplayer (updated variable names)
-Rotor animation refined for smoother performance
-Adjusted rotors friction on shut down
MSFS H125 (AS350B3e) v3.1 – 9/26/25
-Manual updated
-PMS package README updated
-SAS/AP system enhancements
-Added NAV/GPS mode selector button
-Fixed radar altimeter not working
-ATTENTION PMS GTN650/750 USERS (PC)
-The PMS GTN requires an extra package to be installed into the community folder.
-CowanSim PMS GTN650/750 package can be found in the main product folder.
-For MSFS 2024 streaming find them here: https://cowansim.com/manuals-checklists/
-PMS GTN 650/750 base package can be found at https://pms50.com/msfs/
-You’ll need BOTH installed
MSFS H125 (AS350B3e) v3.0 – 9/17/25
-Upgraded G3X vertical units to the G3X Touch
-Added CowanSim Advanced SAS Autopilot System
-Added SAS Autopilot System Manual to package
-Added Force Trim Release (FTR) and trim hat support
-Improved floats with realistic buoyancy and floating behavior
-Corrected VR loading position (map reset for proper centering)
-Resolved glass/window flickering issue
-Fixed the panel lights
-Removed doors from weight calculations for cross-simulator and multiplayer compatibility (add/remove click spots remain)
-Updated in sim checklist
-Updated weight positions for options
-Fixed search light draining power
-Fixed vertical reference window floor glitch
-Various bug fixes and performance improvements
ATTENTION PMS GTN650/750 USERS (PC)
-The PMS GTN requires an extra package to be installed into the community folder.
–CowanSim PMS GTN650/750 package can be found in the main product folder.
–PMS GTN 650/750 base package can be found at https://pms50.com/msfs/
MSFS H125 (AS350B3e) v2.1 – 5/30/24
-Fixed the search light from being stuck on when the taxi light was on too.
-Fixed other small bugs with the weight and balance options.
-Fixed some FLT issues that were causing problems depending on how the fight was started.
-The fuel pump is not on by default when loading cold and dark now. (engine not running)
-Glass panel G3X screens are brighter and can be adjusted with the “INST. LIGHTS” potentiometer.
-Multiplayer sounds were fixed to sync up the engine and rotor sound distances.
-SU15 governor code requirements updated to fix any governor issues.
-Changed the functionality of the LIMIT annunciator light to more realistic behavior.
MSFS H125 (AS350B3e) v2.0 – 02/08/2024
UPDATE: A small update was released shortly after v2.0 was released. Since the changes were minor and the product was just submitted to all resellers then it will stay at v2.0.
-Fuel pump bug was fixed
-Flight model was changed/fixed
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v2.0…………..
-A new manual was included, and the online version can be found at https://cowansim.com/manuals-checklists/. Please read it! 90% of questions can be answered and that saves us time. If something does not work right now, there is a reason it doesn’t work. It’s either FPS related or simply not possible right now.
-All hardware bindings are fixed, and several were added. See the manual to learn how to map them all.
-Some important ones added:
-Throttle (see manual)
-Search light (see manual)
-The Nr and N2 increase with power requested now (collective input), like the real thing. Engine trim (beep switch) is done automatically.
-Increased the range of motion for the search light. Left/Right/Up/Down
-Enhanced the search light beam intensity, cone, and range.
-Search light changed to “wing lights” to separate binding from landing or taxi lights.
-The G3X glass panel was added as an option.
-The PMS GTN 650 & 750 and TDS GTNXi 650 & 750 were added as options. These are two different freeware and payware 3rd party products that must be installed separately. Once installed they will show up and work.
-Persistence code was added to save your weight and balance, and options configuration after shutting down. So, when you load your next flight all your settings will be the same as your last flight. You must change the weight and balance options while the helicopter is loaded, and the flight is started, or it will overwrite the values with the last flight values. Don’t use the main menu to do this.
-Trim speed changes were fixed.
-Added an option to remove the front doors independently.
-Added an option to remove the vertical reference window on the floor.
-Changed pilot/passenger weights for visibility to 170 lb / 77kg.
-Fuel consumption was fixed to reflect real world usage.
-Fuel consumption readout on the VEMD updates slower for better visibility.
-Fixed the shadows in the cockpit.
-FLT files adjusted.
-Fixed/added cyclic handling for VR users.
-Electrical systems were enhanced.
-Camera views were added and fixed.
-Interior lighting was enhanced.
-Some animations added and fixed.
-Some fixes/additions to textures and modeling.
-Minor flight model improvements.
-Recalibrated assistance options. (assisted tail rotor and cyclic)
-Added blender model to package for 3D painters.
MSFS H125 (AS350B3e) v1.0.2 – 05/03/2023
- Fixed an issue with the anti-torque pedals that caused the RPM to rise extremely when the anti-torque pedals were pushed to the max, or close. The issue was too much pitch available along with inaccurate angle of attack values causing the blades to stall.
- Fixed the center of gravity out of whack in the weight and balance settings window.
- Added functionality to the spot/search light. There is a controller inside the cockpit to turn on/off and change the direction.
- Fixed several liveries missing the materials for metallic paint.
- Fixed the height and pitch of the model when first loading into the sim.
- Fixed the white tail navigation light that was misplaced in the model along with the node to cast light and the emissive mesh.
- Fixed the battery switch flaw that was causing the avionics switch to be inverted. When the switch was set to emergency shed then the avionics switch was reversed. To eliminate the issue the battery switch was changed to a two way on/off switch without emergency shed.
- When loading cold and dark the avionics switch is now defaulted to off.
- Fixed the mapping (again) for the side basket. Painters can change the color of the basket texture now.
- Fixed the emergency fuel valve click spot and logic.
- Fixed the incorrect vertical speed indicator.
- Fixed the doors open sound when using the weight and balance window to remove the doors.
- Flattened out the mirrors to get a better reflection. There is still an issue, kind of. The mirrors have to be perpendicular to the camera unlike in the real world where they would be at an angle. So the stationary (upper) mirror was remodeled to an exactly upright position, otherwise you would only see the ground and that is just a blob of the ground color, which is boring to look at. That’s as good as they get for now.
- Added a lower mirror adjustment hat switch to the cyclic.
- Flight model and engine changes were made to reflect several real H125 pilots advice.
- Several modeling, textures and coding additions/optimizations/fixes/tweaks.
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MSFS H125 (AS350B3e) v1.0.1 – 04/07/2023
Flight Model
Made some requested changes to the flight model. All taken from real pilots of the helicopter. There are still issues like the translating tendency. When hovering and at low speeds the right skid sits low and that is normal due to translating tendency. But at higher speeds things should level off. About 2-3 degrees roll is needed to stay course right now. The skid low is sticking and still trying to work that out without changing other flight dynamics at the same time. When more tools become available for the flight model then this will be fixed. We need variances in incidence along with the ability to change flight surfaces locations laterally. Other values are still incorrect, like TOT simulation among other small details. Things will only improve with time.
VEMD
Added the scroll functionality to be able to scroll to the start page when above 60% N1. The page on the top screen with the TOT, N1 and TRQ. Fixed the N1 needle. The N1 needle values are 67-101% and the digits below it are 0-100%. That is why you don’t see the needle move when starting and the FLI page pops up at 60% N1.
Governor Trim
Added the governor trim (engine trim). You can now trim the engine manually by mapping the engines trim to buttons. 380-400 Nr. This should be automatic but it’s not possible to programmatically change these values yet. Asobo is working on it. But at least it’s there.
Modeling
Changed the shape and size of the panel hood. Remolded the battery/switch panel to fix modeling errors. Fixed/refined modeling throughout.
Fixed the Heat Blur
The heat blur was not showing so now it’s fixed. You can hide the effect, along with the down-wash effects, by using the two buttons on the lower right of the panel.
Occlusion
The invisible occluders that hide, or push down, the grass under the skids and bear paws now hide when in water. The issue was a box looking cutout when in water. All better now.
Engine Starting
The engine would not start properly after shutting it down, but only if you started the flight with the engine running already. Fixed.
Sounds
Fixed the warning tones for over Nr and under Nr. Intermittent and steady. 285hz and 310hz. Added gong when pushing fire test button. Adjusted some sounds.
Blurred Tail Rotor
Fixed the blurred but shiny tail rotor that looked odd.
Side Basket
For the painters out there, the side basket material was wrong so you could not change the color of the basket. All better.
Known Issues
- The skid low when at speed
- Throttle still cannot be mapped
- COMP textures for some liveries need to be added. (roughness/metallic/PBR)
I’m still working on updates for this and all other projects, so expect news soon.
Thank you for the support,
Josh
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MSFS H125 v1.00 – Initial Release 3/22/2023
This is an ongoing project and will be updated. Thank you for your support.
Josh

