Originally Posted by
BluSdUp
And any compressor or turbine blade SHALL be contained and or spit out rearwards to be certified! Am I right so fare?
Incorrect, a turbine blade release is considered as having infinite energy and is not contained - see Qantas QF32 A380 as an example. For cert compliance you have to show that no catastrophic event can occur as a result of a turbine blade release. For instance, if an APU turbine blade releases then it has to be demonstrated that the trajectory of the release does not compromise primary structure or flight controls, ie the release is satisfactorily mitigated by design.
Also it's not the cowl that contains the fan blade in the event of a FBO, it is the engine case.