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All three engines you show are for fighter jets flying at supersonic speeds. These engines need a low bypass ratio: Why do military turbofan engines use a low bypass ratio? To achieve more thrust at lower bypass ratios, the bypass air needs to be accelerated more, which requires more than one fan stage because axial compressors can only add a limited ...


5

A good and interesting question! @MaximEck's answer has a lot of good points, which I will not repeat, but rather try to complement. My credentials for this answer: I formerly worked at a large engine OEM and was personally involved in the certification of many different engine models. First, I want to clarify the definition of "certified". I ...


2

To paraphrase the above answers, the most serious failure is an uncontained failure. The fan receives most attention for certification. The shroud is supposed to contain a failure of the fan. Much effort goes into this. However it's possible that the failure mode may be so serious that the shroud doesn't contain the failure. SWA1380 was an example of this as ...


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