SWA1380 - diversion to KPHL after engine event

[tdracer]

Originally Posted by Takwis

Yes, they are, to all models of 737. That may not be WHY Boeing is getting busy with the cowling issue, but the cables will be somewhat better protected if the cowling improvements work.

https://www.seattletimes.com/busines...87-dreamliner/

No, the control cable issue isn't fan blades and their associated debris. The cable issue is for an uncontained disc failure - which by definition won't be contained by the nacelle or engine structure (Where will a 1/3 fan disc go? Anywhere it wants to ).
The issue at hand is the failure of the inlet after the Fan Blade Out event. The containment ring worked as intended and contained all the high energy blade debris. However some of the low energy debris traveled forward and damaged the inlet (which didn't happen when they did the FBO test ~25 years ago), combined with higher than expected imbalance loads caused the inlet structure to fail. The damage to the fuselage was caused by the inlet, not the fan blade debris. Big parts departing the engine are a bit no-no since they can cause major damage to other parts of the airframe (the tail being the big concern):

the stresses in the fan cowl were greater than those calculated in the certification analyses. Since the time that the CFM56-7B engine and the Boeing 737-700 airplane were certificated (in December 1996 and December 1997, respectively), new technologies and analytical methods have been developed that will better predict the interaction of the engine and airframe during an FBO event and the response of the inlet, fan cowl, and associated airplane structures.