230
Boeing faces fresh safety questions after engine fire on flight from Scotland
(www.theguardian.com)
this post was submitted on 18 Jul 2024
230 points (97.9% liked)
World News
38830 readers
2580 users here now
A community for discussing events around the World
Rules:
-
Rule 1: posts have the following requirements:
- Post news articles only
- Video links are NOT articles and will be removed.
- Title must match the article headline
- Not United States Internal News
- Recent (Past 30 Days)
- Screenshots/links to other social media sites (Twitter/X/Facebook/Youtube/reddit, etc.) are explicitly forbidden, as are link shorteners.
-
Rule 2: Do not copy the entire article into your post. The key points in 1-2 paragraphs is allowed (even encouraged!), but large segments of articles posted in the body will result in the post being removed. If you have to stop and think "Is this fair use?", it probably isn't. Archive links, especially the ones created on link submission, are absolutely allowed but those that avoid paywalls are not.
-
Rule 3: Opinions articles, or Articles based on misinformation/propaganda may be removed. Sources that have a Low or Very Low factual reporting rating or MBFC Credibility Rating may be removed.
-
Rule 4: Posts or comments that are homophobic, transphobic, racist, sexist, anti-religious, or ableist will be removed. “Ironic” prejudice is just prejudiced.
-
Posts and comments must abide by the lemmy.world terms of service UPDATED AS OF 10/19
-
Rule 5: Keep it civil. It's OK to say the subject of an article is behaving like a (pejorative, pejorative). It's NOT OK to say another USER is (pejorative). Strong language is fine, just not directed at other members. Engage in good-faith and with respect! This includes accusing another user of being a bot or paid actor. Trolling is uncivil and is grounds for removal and/or a community ban.
-
Rule 6: Memes, spam, other low effort posting, reposts, misinformation, advocating violence, off-topic, trolling, offensive, regarding the moderators or meta in content may be removed at any time.
-
Rule 7: We didn't USED to need a rule about how many posts one could make in a day, then someone posted NINETEEN articles in a single day. Not comments, FULL ARTICLES. If you're posting more than say, 10 or so, consider going outside and touching grass. We reserve the right to limit over-posting so a single user does not dominate the front page.
We ask that the users report any comment or post that violate the rules, to use critical thinking when reading, posting or commenting. Users that post off-topic spam, advocate violence, have multiple comments or posts removed, weaponize reports or violate the code of conduct will be banned.
All posts and comments will be reviewed on a case-by-case basis. This means that some content that violates the rules may be allowed, while other content that does not violate the rules may be removed. The moderators retain the right to remove any content and ban users.
Lemmy World Partners
News [email protected]
Politics [email protected]
World Politics [email protected]
Recommendations
For Firefox users, there is media bias / propaganda / fact check plugin.
https://addons.mozilla.org/en-US/firefox/addon/media-bias-fact-check/
- Consider including the article’s mediabiasfactcheck.com/ link
founded 1 year ago
MODERATORS
you are viewing a single comment's thread
view the rest of the comments
view the rest of the comments
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.