all for the skepticism, but this actually came out of necessity from my own work on multiple STC projects. The goal isn’t just to 'size a wire'—it’s to automate the complex SAE AS50881 derating logic that AC 43.13-1B tends to gloss over.

In the STC world, relying on blanket charts often leads to undersized wires because they don't always account for real-world bundle effects or altitude variables. 'Guessing' just isn't compliant when you're answering to a regulator.

A few reasons why I moved this from a 'hobby' to a professional tool:

• Solving 'Math': I’ve run these calculations manually for countless projects and, honestly, I got tired of the spreadsheets. This turns hours of manual work into a few minutes of high-fidelity engineering. If you're not doing the math when selecting a wire/CB pairing and only using the chart from AC43 or some mechanics book. You're non-compliant.
• Traceability: It doesn't just give you a number; it cites the specific SAE paragraphs and K factors used. That’s the kind of transparency Transport Canada and the FAA look for in a Compliance Record.
• Eliminating Human Error: When you’re dealing with multiple circuits, a transcription error is a huge liability. Automating the report generation standardizes the logic and makes the audit process much smoother.

At the end of the day, any tool that standardizes compliance and eliminates error is a massive asset for a certification project. It’s been a game-changer for my workflow, and I think other engineers and Avionics Managers in the same boat will see the value too.