Livery for N89 (very similar to N88, N90, etc), flown by the FAA on Flight Check missions to ensure procedures, airways, and more can be flown and relied on safely.
Many thanks to a real Flight Check captain for providing direct color references.
To my eye the registration looks best in Arial Bold. For copyright reasons, this font file is not included in the download - if you're running Windows, you should be able to grab it out of your C:\Windows\Fonts folder and copy it in to the livery folder. If not, there are several open alternatives to Arial that will probably look fine.