What is this line doing on the engine ?

I’ve notice and I haven’t find the answer yet, so I’m here to ask you.
What is the line/pattern or whatever you call doing on/in the engine ?

Hello @Qantas_ryan !
I found a good link for you: http://aerosavvy.com/aircraft-engine-spirals/
Have a nice day,

1 Like

To see if the engine is on/off.

Thanks, @35000_feet @Sturmovik

1 Like

This topic was automatically closed 90 days after the last reply. New replies are no longer allowed.