AEDT 4a Released
AEDT 4a released. This Simlog examines the practical implications of the release, with a focus on modeling-relevant changes, including platform upgrades, enhancements to helicopter operations, emissions updates, and modifications to climb performance assumptions, and compliance workflows
The FAA released AEDT 4a on January 28, 2026. This version is now the required standard for all FAA actions involving noise, fuel burn, or emissions modeling, effective January 28, 2026, per the FAA AEDT website (see FAA website for details).
This release also comes with a cost for current users.
From a practitioner’s perspective, one of the most important aspects of any AEDT release is the Fleet database update. In AEDT 4a, the FAA did not include fleet changes directly in the release notes or change-log PDF. Instead, fleet updates are documented in a separate Excel file:
Fleet_Database_Updates_AEDT4a.xlsx
This spreadsheet is installed locally with AEDT and can typically be found at:
C:\Program Files\FAA\AEDT4a\Documents
This release also comes with a cost for current users.
Another notable change is that the release notes are not publicly accessible. They must be downloaded after logging in to the AEDT website, a departure from earlier versions, where release documentation was more readily available.
Summary of Updates and Improvements in AEDT 4a
AEDT 4a introduces the following updates and enhancements (from the FAA AEDT website):
- Support for Microsoft Windows 11
- Upgrade to Esri ArcGIS Maps SDK for .NET v200.8
- Upgrade to Microsoft .NET 8
- Addition of helicopter fixed-point profiles
- New helipad-to-helipad operation and track types
- Expanded helicopter spectral class format
- Support for aircraft lead (Pb) emissions and dispersion modeling
- MOVES5 data update for Ground Support Equipment (GSE) fuel sulfur content
- New Non-standard Modeling Report for non-default FAA submittals
- BADA 3 climb calculation updated to use full thrust by default
- Noise modeling with structures (available upon request)
- Updates to Airport, Fleet, and Study databases
Overall, AEDT 4a seems to be a technical and infrastructure-focused release, with particular implications for helicopter modeling, emissions analysis, and compliance workflows. The shift in how fleet updates and release documentation are distributed is worth noting for anyone maintaining validated or traceable modeling processes.
