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Engineering360: "Southwest Airlines Engine Was Missing a Fan Blade, NTSB Says"

04/18/2018 11:23 AM

Read Engineering360 article: Southwest Airlines Engine Was Missing a Fan Blade, NTSB Says.

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#1

Re: Southwest Airlines Engine Was Missing a Fan Blade, NTSB Says

04/18/2018 1:32 PM

Missing a fan blade before the engine failure, or after?

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#2
In reply to #1

Re: Southwest Airlines Engine Was Missing a Fan Blade, NTSB Says

04/18/2018 3:57 PM

I think they'll find the missing blade to be the root of the failure. The question is, was this failure due to metal fatigue or a manufacturing defect?

When I was an inspector for the Airline industry, I made it a point to pay close attention to the blade root/ hub of all the rotating assemblies, just for this reason. NDT doesn't always show the defects unless you send it out to be x-rayed. Even that can be fallible.

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#3
In reply to #2

Re: Southwest Airlines Engine Was Missing a Fan Blade, NTSB Says

04/18/2018 4:03 PM

Apparently, that caused the failure.

Also, if I interpreted the diagram correctly, the victim was seated across the aisle from the blown out window?

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#4
In reply to #3

Re: Southwest Airlines Engine Was Missing a Fan Blade, NTSB Says

04/18/2018 4:52 PM

I don't know, what I understood she was seated next to the window with her seatbelt on. That was probably why she wasn't completely blown out through the window opening. Chances are, she probably got hit by shrapnel that departed the engine before being "sucked out" blown out

I've had to do "emergency dumps" on the pressurized cabins systems on the ground and they are no joke**, anything not tied down or secured would move to the back pressure bulkhead outflow valve. And, if the temperature was cold enough and humidity was high enough, you could fill the cabin with fog and or snow from the pressure drop.

** You do not try this if you have a cold, ear infection, plugged up ear as it will prove to be extremely painful, but I'm sure you already knew that.

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