>> I thought things like this got x-rayed / ultrasound tested periodically.
>>
>> It will be interesting to see when the last one was done.
>>
Certain parts are tested, using Non Destructive Testing (eddy current normally) but there's a limit to what you can test. You can't test every part of an engine it's impractical.
Front fan is normally a visual inspection, it's the hot bits that get the most amount of inspection (again visual only for obvious reasons when on the wing)
When the engine is removed you can do more, dye penetrants etc, but again you can't do every single part.
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