https://www.zerohedge.com/military/f-35s-cooling-crisis-design-flaws-fuel-2-trillion-dilemma-pentagon
"
Still, as time has proven, the massive increase in turbine inlet temperature to an insane 3,600 degrees Fahrenheit—900 to 1,100 degrees more than most other jet fighter engines—ensured that the engine would suffer from reliability and longevity issues. The fact that engine power is required for cooling only exacerbated the problem as power requirements for each F-35 capability upgrade added the need for more cooling, which meant the F-35 engine was subjected to more stress..."
