Libro de Visitas

Dannyrem

21 Jan 2025 - 08:44 pm

A year ago today, things went from bad to worse for Boeing
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At 5 p.m. PT on January 5, 2024, Boeing seemed like a company on the upswing. It didn’t last. Minutes later, a near-tragedy set off a full year of problems.

As Alaska Airlines flight 1282 climbed to 16,000 feet in its departure from Portland, Oregon, a door plug blew out near the rear of the plane, leaving a gaping hole in the fuselage. Phones and clothing were ripped away from passengers and sent hurtling into the night sky. Oxygen masks dropped, and the rush of air twisted seats next to the hole toward the opening.
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Fortunately, those were among the few empty seats on the flight, and the crew got the plane on the ground without any serious injuries. The incident could have been far worse — even a fatal crash.

Not much has gone right for Boeing ever since. The company has had one misstep after another, ranging from embarrassing to horrifying. And many of the problems are poised to extend into 2025 and perhaps beyond.

The problems were capped by another Boeing crash in South Korea that killed 179 people on December 29 in what was in the year’s worst aviation disaster. The cause of the crash of a 15-year old Boeing jet flown by Korean discount carrier Jeju Air is still under investigation, and it is quite possible that Boeing will not be found liable for anything that led to the tragedy.
But unlike the Jeju crash, most of the problems of the last 12 months have clearly been Boeing’s fault.

And 2024 was the sixth straight year of serious problems for the once proud, now embattled company, starting with the 20-month grounding of its best selling plane, the 737 Max, following two fatal crashes in late 2018 and early 2019, which killed 346 people.

Still the outlook for 2024 right before the Alaska Air incident had been somewhat promising. The company had just achieved the best sales month in its history in December 2023, capping its strongest sales year since 2018.

It was believed to be on the verge of getting Federal Aviation Administration approval for two new models, the 737 Max 7 and Max 10, with airline customers eager to take delivery. Approvals and deliveries of its next generation widebody, the 777X, were believed to be close behind. Its production rate had been climbing and there were hopes that it could be on the verge of returning to profitability for the first time since 2018.

Donaldginue

21 Jan 2025 - 08:42 pm

Most plane crashes are ‘survivable’
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First, the good news. “The vast majority of aircraft accidents are survivable, and the majority of people in accidents survive,” says Galea. Since 1988, aircraft — and the seats inside them — must be built to withstand an impact of up to 16G, or g-force up to 16 times the force of gravity. That means, he says, that in most incidents, “it’s possible to survive the trauma of the impact of the crash.”

For instance, he classes the initial Jeju Air incident as survivable — an assumed bird strike, engine loss and belly landing on the runway, without functioning landing gear. “Had it not smashed into the concrete reinforced obstacle at the end of the runway, it’s quite possible the majority, if not everyone, could have survived,” he says.

The Azerbaijan Airlines crash, on the other hand, he classes as a non-survivable accident, and calls it a “miracle” that anyone made it out alive.
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Most aircraft involved in accidents, however, are not — as suspicion is growing over the Azerbaijan crash — shot out of the sky.

And with modern planes built to withstand impacts and slow the spread of fire, Galea puts the chances of surviving a “survivable” accident at at least 90%.

Instead, he says, what makes the difference between life and death in most modern accidents is how fast passengers can evacuate.

Aircraft today must show that they can be evacuated in 90 seconds in order to gain certification. But a theoretical evacuation — practiced with volunteers at the manufacturers’ premises — is very different from the reality of a panicked public onboard a jet that has just crash-landed.
Galea, an evacuation expert, has conducted research for the UK’s Civil Aviation Authority (CAA) looking at the most “survivable” seats on a plane. His landmark research, conducted over several years in the early 2000s, looked at how passengers and crew behaved during a post-crash evacuation, rather than looking at the crashes themselves. By compiling data from 1,917 passengers and 155 crew involved in 105 accidents from 1977 to 1999, his team created a database of human behavior around plane crashes.

His analysis of which exits passengers actually used “shattered many myths about aircraft evacuation,” he says. “Prior to my study, it was believed that passengers tend to use their boarding exit because it was the most familiar, and that passengers tend to go forward. My analysis of the data demonstrated that none of these myths were supported by the evidence.”

Michaelsof

21 Jan 2025 - 07:44 pm

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Eugenesoamy

21 Jan 2025 - 04:46 pm

The survivors of recent crashes were sitting at the back of the plane. What does that tell us about airplane safety?
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Look at the photos of the two fatal air crashes of the last two weeks, and amid the horror and the anguish, one thought might come to mind for frequent flyers.

The old frequent-flyer adage is that sitting at the back of the plane is a safer place to be than at the front — and the wreckage of both Azerbaijan Airlines flight 8243 and Jeju Air flight 2216 seem to bear that out.
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The 29 survivors of the Azeri crash were all sitting at the back of the plane, which split into two, leaving the rear half largely intact. The sole survivors of the South Korean crash, meanwhile, were the two flight attendants in their jumpseats in the very tail of the plane.

So is that old adage — and the dark humor jokes about first and business class seats being good until there’s a problem with the plane — right after all?

In 2015, TIME Magazine reporters wrote that they had combed through the records of all US plane crashes with both fatalities and survivors from 1985 to 2000, and found in a meta-analysis that seats in the back third of the aircraft had a 32% fatality rate overall, compared with 38% in the front third and 39% in the middle third.

Even better, they found, were middle seats in that back third of the cabin, with a 28% fatality rate. The “worst” seats were aisles in the middle third of the aircraft, with a 44% fatality rate.
But does that still hold true in 2024?

According to aviation safety experts, it’s an old wives’ tale.

“There isn’t any data that shows a correlation of seating to survivability,” says Hassan Shahidi, president of the Flight Safety Foundation. “Every accident is different.”

“If we’re talking about a fatal crash, then there is almost no difference where one sits,” says Cheng-Lung Wu, associate professor at the School of Aviation of the University of New South Wales, Sydney.

Ed Galea, professor of fire safety engineering at London’s University of Greenwich, who has conducted landmark studies on plane crash evacuations, warns, “There is no magic safest seat.”

Josephmalay

21 Jan 2025 - 04:45 pm

Scientists have identified an estimated 10% of all species on Earth. Here’s what they found in 2024
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A toothy toadstool. A vegetarian piranha with a distinctive mark. And a pygmy pipehorse floating in the Indian Ocean shallows.

These wild wonders were among the hundreds of previously unknown species of animals, plants and fungi that scientists named and described for the first time in 2024, expanding our surprisingly limited knowledge of Earth’s diversity.

“Scientists estimate that we’ve identified only one-tenth of all species on Earth,” said Dr.
Shannon Bennett, chief of science at the California Academy of Sciences, in a statement.

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“While it is critical to place protections on known threatened species, we must also allocate resources towards identifying unknown species that may be just as important to the functioning of an ecosystem,” Bennett said.

Researchers connected to the institution described 138 new species in 2024, including 32 fish. One standout was a pygmy pipehorse named Cylix nkosi. The seahorse relative was originally found in 2021 in the cool temperate waters surrounding the North Island of New Zealand, but the species described this year was discovered in the subtropical waters off South Africa, expanding the known range of this group to the Indian Ocean

“South African reefs present notoriously difficult diving conditions with rough weather and intense, choppy waves — we knew we only had one dive to find it,” underwater photographer and marine biologist Richard Smith said in a statement.
“This species is also quite cryptic, about the size of a golf tee, but luckily we spotted a female camouflaged against some sponges about a mile offshore on the sandy ocean floor.”

The researchers involved in describing the new species chose nkosi as its name. A reference to the local Zulu word for “chief,” the name reflects the species’ crown-like head shape and acknowledges South Africa’s KwaZulu-Natal province where it was found.

Barrycoazy

21 Jan 2025 - 03:22 pm

Carrie Underwood slated to perform at Trump’s inauguration
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Country music star Carrie Underwood is slated to perform “America the Beautiful” at President-elect Donald Trump’s inauguration, according to a copy of the program obtained by CNN and confirmed by a spokesperson for the inaugural committee.

“I love our country and am honored to have been asked to sing at the Inauguration and to be a small part of this historic event,” Underwood said in a statement to CNN. “I am humbled to answer the call at a time when we must all come together in the spirit of unity and looking to the future.”

The presidential oath of office will be administered by Supreme Court Chief Justice John Roberts with Justice Brett Kavanaugh expected to administer the oath of office to Vice President-elect JD Vance.

Trump’s inauguration as the 47th president of the United States will take place on January 20 at the US Capitol.

Underwood is a big get for Trump’s inauguration, considering Hollywood’s Trump blackout over the course of his political career.

In his first term and throughout the past three elections, Trump has struggled to garner support from major Hollywood stars. At the Republican National Convention last year, the two biggest stars onstage with Trump were musician Kid Rock and retired WWE wrestler Hulk Hogan – a far cry from a superstar at the height of their career, like Underwood.

The Grammy-winning artist is as high-profile as you can get in country music, not only with numerous platinum hits, but also with public-facing, mainstream business associations. Underwood is the face of Sunday Night Football and is set to make her debut this March as a judge on ABC’s “American Idol” – the singing competition show that catapulted her to fame when she won in 2005.

While many NFL fans will likely applaud Underwood for singing at the inauguration, any time a celebrity aligns themselves with Trump, they run the risk of alienating left-leaning fans and Hollywood allies.

Underwood has kept her politics under wraps over the course of her career. In her statement, she did not mention Trump by name and kept her focus on unifying the country – still, Underwood’s decision to publicly align with Trump is a big statement for any star, particularly one as private as the singer.

Historically, Hollywood has always been closely associated with the Democratic Party, but country stars have always been an outlier, leaning more conservative. In recent years, as new singers join the genre, country music has gotten to be more progressive. This past election cycle, country stars like Mickey Guyton and Maren Morris stood with Vice President Kamala Harris.

Zhedazattitra

21 Jan 2025 - 02:45 pm

Der Balanset-1A: Ein effizientes Tool zur Rotorbalancierung



Die Balancierung von Rotoren in einer oder zwei Ebenen der Korrektur ist ein wichtiger Schritt, um die Leistung und Lebensdauer von Maschinen zu verbessern. Die Anzahl der Balancierungsebenen hängt von den konstruktiven Merkmalen des Rotors der zu balancierenden Maschine ab.



Die Balancierung in einer Ebene ("statisch") wird in der Regel für schmale, scheibenförmige Rotoren durchgeführt, die keine signifikanten axialen Verschiebungen aufweisen. Typische Beispiele für Rotoren dieser Klasse sind:





Schleifscheiben

Riemenscheiben

Schwungräder

Zahnräder

Kupplungen

Spannzangenfutter von Drehmaschinen

Schmale Lüfter usw.





Die Balancierung in zwei Ebenen ("dynamisch") wird für lange, wellenförmige Rotoren mit zwei Stützpunkten durchgeführt. Beispiele für Rotoren dieser Klasse sind:





Rotoren von Elektromotoren und Generatoren

Rotoren von Kompressoren und Pumpen

Arbeitsräder von Turbinen und Lüftern

Breite Schleifscheiben

Spindeln

Wellen von Mahlmaschinen mit Schlagmessern usw.





Der Balanset-1A ist ein Gerät, das speziell für die Bequemlichkeit und Mobilität entwickelt wurde. Dank des kompakten und robusten Koffers kann es leicht transportiert werden, was besonders wichtig ist für diejenigen, die häufig außerhalb von stationären Bedingungen arbeiten, z.B. auf Produktionsstätten.



Das Gerät wird mit einem Laptop verbunden, und seine Software bietet eine intuitive Benutzeroberfläche mit schrittweisen Anweisungen zur Konfiguration und Balancierung. Alles, was der Benutzer tun muss, ist den Anweisungen zu folgen, und das Programm berechnet automatisch die Ausgleichsgewichte und deren Installationswinkel.



Der Balanset-1A kombiniert die Funktionen eines Schwingungsmessers und eines Auswuchtgeräts. Im Schwingungsmessmodus können Sie die Gesamtvibration überwachen, Spektren erstellen und Harmonische analysieren, um ein umfassendes Bild des Mechanismuszustands zu erhalten. Im Auswuchtmodus steht die Berechnung der Masse und der Winkel der Gewichte zur Installation in einer oder zwei Ebenen zur Verfügung.



Mit einer Messgenauigkeit von ±1° bei der Phasenmessung und einer Genauigkeit von ±5% bei den Vibrationswerten entspricht das Gerät hohen Standards. Dies macht es geeignet für Aufgaben, bei denen Präzision wichtig ist, von der Lüfterauswuchtung bis zur Einstellung der Rotoren von Industriemaschinen.



Der Balanset-1A ist ideal für die Serienproduktion geeignet, wo eine regelmäßige Auswuchtung einer großen Anzahl identischer Rotoren erforderlich ist. Das Gerät ermöglicht es, Daten aus früheren Sitzungen leicht zu speichern und zu verwenden, was den Prozess beschleunigt und den Arbeitsaufwand reduziert.



Für Fälle, in denen eine genaue Messung des Phasenwinkels nicht erforderlich ist, kann das Gerät auch ohne Tachometer verwendet werden. Es zeigt den Gesamtvibrationspegel an, was für eine schnelle Diagnose praktisch ist. Bei Bedarf kann jedoch ein Tachometer für erweiterte Messungen installiert werden.



Der Balanset-1A wird mit einer einjährigen Garantie geliefert, und die Firma Vibromera bietet technischen Support und Hilfe bei Problemen. Dies ist wichtig für Benutzer, die auf die Zuverlässigkeit des Geräts auf lange Sicht setzen.



Mit seinem ausgezeichneten Preis-Leistungs-Verhältnis ist der Balanset-1A sowohl für große Produktionsstätten als auch für kleine Werkstätten eine gute Investition für die Verbesserung der Produktqualität bei minimalen Kosten.

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Jamesnam

20 Jan 2025 - 01:43 pm

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20 Jan 2025 - 12:36 pm

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