Bogus parts in the airlines.  

Reminder, not just fixed wing, but applies to rotor wing as well. For mechanics, know the source of where your parts come from. If it doesnt look right, missing a 8130 serviciable tag (especially on a tracked component)or isnt completed, don't install it until the issue is resolved. Mechanics ultimately held responsible for the parts they install. Don't fall for the line "Just put it on and we will get back to you with the information."   

Fake Jet Engine Parts Ground American, Southwest, United Planes (thedrive.com)