Discussion: NTSB: Blown Jet Engine Of Southwest Airlines Plane Showed 'Metal Fatigue'

Hmm, ā€˜Metal Fatigueā€™ goes almost without saying, but why did the kevlar-safety belt not contain the pieces ? Itā€™s precisely there in order to avoid puncturing the fuselage.

"The jetā€™s CFM56-7B engines were made by CFM International, jointly owned by General Electric and Safran Aircraft Engines of France. "
The outer covering of the engine was made by Safran (previously Snecma) and the core was possibly made in Cincinnati ohio. It is an american engine that can be sold to Airbus and Boeing.
The ā€œfanā€ is what pulls the airplane through the air. The jet thrust pushes to a lesser degree. A lot of engineers will be working late on this one.

My conservative ā€œchristianā€ boss made a joke about her this morningā€¦wtf dude!

Or her seat belt not hold her in better?

Some people donā€™t strap in, unless the sign is onā€¦(but this is a secondary thing, punching holes in the cabin is a big no-no! )

Not really. ā€˜Metal fatigueā€™, or fatigue failure is extremely rare in the aircraft industry, especially in a well known aircraft like the 737. Something else went wrong. Either a bad batch of material, or fake replacement parts were involved. Luckily, due to industry regulations, EVERYTHING is 100% traceable, down to the source of the original material and parts. Something went wrong with the system here, and we donā€™t know yet.

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Well, AFAIK fatigue cracks is something they test for during maintenance (Iā€™m in a related business) , the worst problem here is the missing containment.

The engine type must be the most used Turbofan, both the USAirforce and thousands of civilian planes use itā€¦

Almost certainly she did not have the belt fastened. Keep your belts fastened.

The safety record of US airlines is now great, to a degree that is almost beyond belief. It defies every possible narrative that is critical of corporations, government and everything in between in this period in time and history.

The ā€œfanā€ is what pulls the airplane through the air. The jet thrust pushes to a lesser degree. A lot of engineers will be working late on this one.

I believe you have that backwards. Or maybe you are thinking of a turboprop engine.

Jets get most of their thrust from the jet of hot expanding combustion gasses and air being thrown out the back.

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Iā€™m wondering that, too. I havenā€™t seen any stories that addressed whether or not her belt was fastened, or broke, or was too loose (she had to be a petite woman, to go through the window.)

I would like the matter of her seat belt clarified.

Iā€™ve flown a million miles in the last 25 years. While Iā€™m generally a very poor example of a safety conscious person, I ALWAYS have my seat belt fasted from the moment my ass hitā€™s the chair until I deplane. Over night flights to Europe and Asia, always.

I suppose itā€™s possible she had her belt on and her upper body was sucked out. Iā€™d like to know.

Congress spends a lot of time in the air.

well I doubt airplanes run sea level pressure of 14.7psi but looking and using this differential pressure between inside and outside of 9.2

https://www.quora.com/What-is-the-difference-in-air-pressure-between-the-inside-and-outside-of-an-airliner-at-thirty-thousand-feet

and the window was say 1 sq. foot or 12 x 12 = 144 in. sq,that gives about 144 in-sq. x 9.2 lb/in-sq or 1325 pounds of force pushing out. Plus the air rushing past at high speed would lower pressure a bit and then pull on anything once outside.

And Donaldā€¦ :wink: