Classics Seekers WTF!?

I was getting ready to remove the canopy cover from Skywarp (to see if I could do it without hurting the fig, before moving on to 'Scream & Ramjet), and noticed something I've never seen before, nor have heard anyone talk about on any message board...
The turbine fans rotate out!

Why do they do this? What purpose could those joints serve? I'm so confused right now...
The turbine fans rotate out!

Why do they do this? What purpose could those joints serve? I'm so confused right now...