Changing a jet engine.

[jimustanguitar]

I never realized that there were mount points for chain hoists and things like that on big jets. Pretty interesting. 

imgur.com/gallery/F2Z17
The album continues farther than you think. Click on the blue "load more pictures" button right above the comments. 

[sbassinvader]

Very interesting. Now that I know those things are only held on by 8 bolts, i may never fly again.