No Engine, No Fly: Ongoing Propulsion Program Problems Are Grounding F-35s

Lack of spare parts and engines, an under-investment depot-level infrastructure, and much more, have put the F135 engine program under fire. 

https://www.thedrive.com/the-war-zone/no-engine-no-fly-ongoing-propulsion-program-problems-are-grounding-f-35s