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Making the Brazilian ATR-72 Spin
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Note: This story was corrected on August 10th at 10:23 am, thanks to the help of a sharp-eyed reader.
Making an ATR-72 Spin
I wasn’t in Brazil on Friday afternoon, but I saw the post on Twitter or X (or whatever you call it) showing a Brazil ATR-72, Voepass Airlines flight 2283, rotating in a spin as it plunged to the ground near Sao Paulo from its 17,000-foot cruising altitude. All 61 people aboard perished in the ensuing crash and fire. A timeline from FlightRadar 24 indicates that the fall only lasted about a minute, so the aircraft was clearly out of control. Industry research shows Loss of Control in Flight (LOCI) continues to be responsible for more fatalities worldwide than any other kind of aircraft accident.
The big question is why the crew lost control of this airplane. The ADS-B data from FlightRadar 24 does offer a couple of possible clues. The ATR’s speed declined during the descent rather than increased, which means the aircraft’s wing was probably stalled. The ATR’s airfoil had exceeded its critical angle of attack and lacked sufficient lift to remain airborne. Add to this the rotation observed, and the only answer is a spin.
Can a Large Airplane Spin?
The simple answer is yes. If you induce rotation to almost any aircraft while the wing is stalled, it can spin, even an aircraft as large as the ATR-72. By the way, the largest of the ATR models, the 600, weighs nearly 51,000 pounds.
Of course, investigators will ask why the ATR’s wing was stalled. It could have been related to a failed engine or ice on the wings or tailplane. (more…)
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How the FAA Let Remote Tower Technology Slip Right Through Its Fingers
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In June 2023, the FAA published a 167-page document outlining the agency’s desire to replace dozens of 40-year-old airport control towers with new environmentally friendly brick-and-mortar structures. These towers are, of course, where hundreds of air traffic controllers ply their trade … ensuring the aircraft within their local airspace are safely separated from each other during landing and takeoff.
The FAA’s report was part of President Biden’s Infrastructure Investment and Jobs Act enacted on November 15, 2021. That bill set aside a whopping $25 billion spread across five years to cover the cost of replacing those aging towers. The agency said it considered a number of alternatives about how to spend that $5 billion each year, rather than on brick and mortar buildings.
One alternative addressed only briefly before rejecting it was a relatively new concept called a Remote Tower, originally created by Saab in Europe in partnership with the Virginia-based VSATSLab Inc. The European technology giant has been successfully running Remote Towers in place of the traditional buildings in Europe for almost 10 years. One of Saab’s more well-known Remote Tower sites is at London City Airport. London also plans to create a virtual backup ATC facility at London Heathrow, the busiest airport in Europe.
A remote tower and its associated technology replace the traditional 60-70 foot glass domed control tower building you might see at your local airport, but it doesn’t eliminate any human air traffic controllers or their roles in keeping aircraft separated.
Max Trescott photo Inside a Remote Tower Operation
In place of a normal control tower building, the airport erects a small steel tower or even an 8-inch diameter pole perhaps 20-40 feet high, similar to a radio or cell phone tower. Dozens of high-definition cameras are attached to the new Remote Tower’s structure, each aimed at an arrival or departure path, as well as various ramps around the airport.
Using HD cameras, controllers can zoom in on any given point within the camera’s range, say an aircraft on final approach. The only way to accomplish that in a control tower today is if the controller picks up a pair of binoculars. The HD cameras also offer infrared capabilities to allow for better-than-human visuals, especially during bad weather or at night.
The next step in constructing a remote tower is locating the control room where the video feeds will terminate. Instead of the round glass room perched atop a standard control tower, imagine a semi-circular room located at ground level. Inside that room, the walls are lined with 14, 55-inch high-definition video screens hung next to each other with the wider portion of the screen running top to bottom.
After connecting the video feeds, the compression technology manages to consolidate 360 degrees of viewing area into a 220-degree spread across the video screens. That creates essentially the same view of the entire airport that a controller would normally see out the windows of the tower cab without the need to move their head more than 220 degrees. Another Remote Tower benefit is that each aircraft within visual range can be tagged with that aircraft’s tail number, just as it might if the controller were looking at a radar screen. (more…)
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Internet Radio and Business Aviation: Some Big Businesses Would Like to Kill Them Both
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As an author, I pay pretty close attention to discussions about copyright and royalties. And aviation industry folks should be very afraid too since the Feds at the U.S. Copyright Office’s Copyright Royalty Board are trying to sink Internet Radio broadcasting with huge fee increases much the way the FAA is after business and general aviation with fresh sources of cash.
And sitting in the wings watching the action closely on the broadcast side too are a few large media companies waiting to pick up the pieces, just like the airlines are doing to business aviation.
Small Businesses at Work
Internet Radio stations are traditionally small businesses run by radio junkies who devote their lives to building music libraries and playing tunes to listeners around the world via their broadband link.
These broadcasters truly do march to the beat of a different drum as Thoreau said. They also march in front of plenty of listeners, 10 million at last count through some 10,000 different stations. You can almost hear the cash registers going “ka ching,” at the big media companies that would like to see these annoying little businesses evaporate. (more…)
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United Airlines … News You Can Use
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A few months back, I mentioned that things were about to turn ugly for the summer travel season. Scott McCartney at the Wall Street Journal seems to agree.
Now you all know how much delight I take at poking fun at Chicago’s hometown airline United whenever they give me the ammunition … which is pretty often.
Scott McCartney’s column this morning was way funnier than anything I could ever write about the UAL behemoth, especially since he focused on expatriate Chicagoan and radio host Scott Simon.
I had to share a few lines from McCartney’s story. They’d be even funnier if they didn’t paint such a sad picture of the airline …
United lost National Public Radio host Scott Simon’s luggage on a flight from San Francisco to Las Vegas last week. After filling out paperwork in Las Vegas, Mr. Simon was given a phone number and email address to contact the San Francisco baggage office — with the caution that San Francisco never answers the phone or responds to email.
More than 30 calls later, Mr. Simon, an elite-level frequent flier on United, has yet to reach a United baggage official in San Francisco, or learn anything about the fate of his baggage, which includes irreplaceable items after adopting his second child in China. Calls to the airline’s main toll-free line haven’t yielded any information, either. American Express Co. is also trying to track down information, a service for its platinum customers, but hasn’t gotten through to United, either.
“It’s incredibly frustrating,” Mr. Simon said. “I know they are overworked, and it seems they have decided the best way to avoid more work is to not answer the phone or respond to email.” He likened the baggage office to someone deeply in debt who simply stops opening bills that arrive in the mail.
A spokeswoman for United says the airline is trying to find Mr. Simon’s lost bag.
Technorati tags: United+Airlines, NPR, Wall Street Journal, Jetwhine
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Aerospace Journalist of the Year
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I was in Paris this year to attend the awards dinner for Aerospace Journalist of the Year in the Business Aviation category. Although I was not the ultimate winner in the category – that honor went to Fred George of Business and Commercial Aviation – I am very proud to have been included on the short list with so many other writers I’ve followed over the years.
Since these awards unfortunately seem to garner little attention within our industry, I’m pleased to share the names of all the winners here.
I was most impressed during the award ceremony when AIN’s Thierry Dubois accepted his award for the Best Technology submission
. Dubois, a Paris local, made an passionate speech about the need to remember the number of international journalists killed or taken prisoner as they carry out their work.
Pretty interesting fellow Thierry is.
Hopefully I’ll try and snag him for an interview here at Jetwhine to talk more about aviation and journalism.