> better analogy would be a Jet engine that has an expected lifetime of 5,000 hours, but operated for 100,000 hours caught fire on the tarmac while no passengers were aboard. Therefore all flights from all aircraft with the engine are grounded indefinitely
If the airline attempted to take off with it, yes, that merits a grounding.
If the airline attempted to take off with it, yes, that merits a grounding.