232
Boeing faces fresh safety questions after engine fire on flight from Scotland
(www.theguardian.com)
this post was submitted on 18 Jul 2024
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OK, checking out the article, actually it seems totally innocent on the maintenance side of things- there was a turbine blade fracture during flight. Turbines are generally very reliable but it's a gargantuan pain in the ass to test those blades because they're crystalline structures, so a fracture goes from nanoscopic to taking out the whole blade all at once. I wouldn't expect maintainers to catch that.
The criminal part is actually way more interesting and concerning.
Civilian aircraft are built to be safe. I mean REALLY safe. Every system has a redundant (backup) system you can switch to if that system goes down and a way to isolate a damaged system. Planes can fly on only one working engine, or even safely glide down to the ground if they have no engines. We literally blow some engines up in their final stages of testing to make sure they can't blow up hard enough to take the wing out. Regulations demand it.
So that's why this is a criminal case. Because after that engine blade came loose and hit the wing, it ruptured a fuel line...
In an aircraft that was designed in compliance with regulations, while this would still be be cause to turn around and land the plane, it shouldn't actually be a safety problem at all. Just isolate the damaged system and switch to the redundant one. And they didn't have the ability to do that. Meaning that their aircraft design itself is likely out of compliance with regulations and doesn't meet the minimum safety requirements to have civilians on it. Which is... honesty way weirder, because who the hell signed off on this thing if it had a design issue like this?
Well, except for the wings. And the cockpit. And the fuselage. And its accompanying door plugs
Are you daft? Why do you think it has TWO wings and TWO doors? And clearly you've never been invited to the under cock pit, where they keep plugs fit for any hole.
(is joke don't bite)
Not sure about the commercial planes, but some planes have a redundant wing.
https://theaviationgeekclub.com/time-israeli-air-force-f-15-baz-landed-one-wing-missing/
Boeing.
The FAA has been allowing them to self-certify some safety analyses. I don't know if it was this model, or this kind of certification, but the FAA has definitely not been doing a thorough job.
Are you implying they are not metal? Or that their heat treatment makes them brittle? If it’s the latter, that’s clearly a defect. Metals can achieve high rigidity and still retain great resistance through heat treatment.
Of the top of my head, IIRC the blades in a turbine are grown into a single crystal of titanium so there's no weak points between the crystalline structure.
Edit. https://www.theengineer.co.uk/content/in-depth/jewel-in-the-crown-rolls-royce-s-single-crystal-turbine-blade-casting-foundry
Not titanium, nickel alloy.
Christ on a cracker!
Metals are crystalline, and high stress loads associated with being rotated like crazy make things brittle. IDK how brittle though, steel normally is super stretchy if I remember my studies right.
That’s why I asked for clarification. The line about them being crystalline makes no sense. Copper is crystalline, and can be super malleable or quite brittle depending on the grain structure. And you just don’t use brittle materials for high speed rotating equipment. And there are non destructive tests to check for embrittlement/fatigue.
Metals are made of crystals, they usually defourm along the grain boundaries and fatigue cracks also grow along them. By eliminating those boundaries you reduce the chance for fatigue cracks and make the overall blade stronger.
What page did you see those details on in the report? I skimmed it between meetings and will look again later.