Any script to plot multi axis FDR / flight-test data (such as the ones used in air crash investigation)? I am looking for a script or tool to create flight test and/or FDR plots with several vertical axis, such as the ones used in aircraft accident investigations.

Does anyone have any hint on a MATLAB or Python script that does it? I have the data and I know how to code, just didn't want to reinvent the wheel here.

Example:

Source
I don't think these plots are generated from Matlab or Python, but from special-purpose software. This was discussed in chat a couple of months ago, and one example is Insight Analysis, which offers a GUI interface to put together the kind of chart you're looking for. It's definitely not the only such tool, though.