A2A Simulations has released a significant update for its Accu-Sim Aerostar 600 for Microsoft Flight Simulator 2020 and Microsoft Flight Simulator 2024.
This new v1.0.4 update features upgrades across systems, sounds, visuals, physics, and avionics, along with a number of fixes and quality-of-life improvements. Some of the highlights include new visible passengers in all cabin seats, improved avionic behaviour, refined lighting and panel colour tuning, enhanced ground shock absorption, multiple system improvements, fixes for internal and external sound and more.
The full changelog can be found below.

You can download the new A2A Accu-Sim Aerostar 600 v1.0.4 update from the A2A Store.
This update will be submitted to third-party partners, including the MSFS Marketplace, shortly.
Changelog
- Added visible passengers on all seats (note: Copilot visibility is controlled through MSFS settings)
- Hydraulic failures were happening too often. Fixed.
- More ground shock absorption
- Tightened cabin, improved ground physics sounds
- Reworked the airframe shaking sounds
- Improved internal lighting
- Adjusted panel color
- Fixed external sound crackling when zooming the camera
- New grass ground roll
- New brake squeal sounds
- New starter physics
- Updated starter sounds
- Tweaked tablet auto brightness
- Map light fixed
- Fixed KLN electricity circuit index
- EDM fixed the REQ/RES display with direct-to
- Collins radios: added support for stock MSFS frequency inc/dec bindings
- Turbulence in VR enabled
- Fixed GPS 650 sounds
- Engine idle position control added to the tablet
- Runaway fuel pressure fixed
- Improved oil pressure, fuel pressure and manifold pressure variance per aeroplane
- Simplified magneto code
- [Tablet] Magnetos controls as radiobutton
- [Tablet] Pitot tube cover, jacks and engine heaters controls disabled in flight
- Improved PMS GPS hot swapping
MSFS 2020 Specific
- KLN90B, GNS 430 & 530 units are clickable (MSFS2020)
- Fixed GTN650 buttons (MSFS2020)
- Added aircraft descriptions (MSFS2020)
- Fixed beacon light bleed (MSFS2020)
- Fixed window fogging issues with initialisation and cabin air exchanging [MSFS2020]






