There is one:
X-Plane Animation Plug-In Tutorial
...but for some reason, the author details how to animate a gravel-dumping dump truck instead of something aircraft-centric and useful, like, say, a landing gear sequence with multiple doors, ground-reactive gear strut oleos and complex rotations. That, I think would have covered just about every contingency for aircraft kit.
If I can figure out how to do the animations properly one day, I might have to create said tutorial myself. But, I digress... I think the tutorial at least introduces the subject at a reasonable level of detail.
One thing you'll have to add to this is to look through the VERY long list of X-Plane functions you can attach to each animation, in order to find the correct ones for each of the parts you're animating. I believe the file is in a ReadMe within the plug-in, but don't quote me on it. You'll be able to quickly find that data somewhere in the plug-in or on the web with a few Google searches.