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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.
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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Expect a Dark Christmas at United Airlines
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The Christmas season may be a bit barren this year for the people who work for United Airlines. Not of course the management folks. Somehow their piece of the pie never seems to come out damaged when things are tight.
I was thinking more of the rank-and-file types, the flight attendants, the mechanics, the pilots, the ramp rats (affectionately), the gate agents, those people the upper echelons often refer to as the riff raff. I prefer to think of them as the folks who carry out the orders from HQ.
Now that shareholders have begun demanding more value, it would be wise for employees to realize that shareholder value and stakeholder value are not even close to the same thing.
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It’s Official: Columbia is Now a Cessna
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Just when I thought I’d never again need to worry about remembering more model numbers Cessna tonight announced not only that it was the successful bidder in the Columbia bankruptcy case, but that it would rename those two new airplanes the Cessna 350 and the Cessna 400.
Not only does Cessna get a fine company with a great line of products that have delivered over 600 airframes in 10 years, but they now build the fastest single-engine production airplanes on the planet. The Cessna 400 will clip along at 235 KIAS. Best of all for all those folks in Bend Oregon, the Columbia lives on and a lot of people get to keep their jobs. And there’s more good economic news apparently in the hopper for Bend as well.
The transaction is expected to close December 4, 2007. Now I just need to figure out how to add a little Cessna 400 time to my logbook.
Cessna History Quiz
OK you knowledge junkies. In order now, give me the three-number identifier for all the Cessnas built with model numbers after the Cessna 400. And this one is probably too easy, so let’s add in the name. For instance, the C172 is the Skyhawk and the C182 is the Skylane.
I have no idea what the prize will be yet, but I’ll think of something commensurate with the sweat that will pour from your brow as you think of the answer.
Technorati tags: Cessna Aircraft Company, Columbia Aircraft, Bend Oregon, Jetwhine, air travel, Cessna 400
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Think Airplanes and Turkeys
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I love offering my two cents on everything aviation here at Jetwhine. But every so often I also like to share a few stories about some of the cool people I’ve met along the way during my career.
Since today is Thanksgiving and most everyone is thinking about turkey, it seemed appropriate to tell a quick story about Herb Kelleher, who at the time I met him was still the head honcho at Southwest Airlines. Today Herb is chairman of the airline’s board.
Seven or maybe eight years ago, I was invited to hear Herb speak at the Transportation Center at Northwestern University where I interned as a grad student.
After Herb gave his talk, the professor who invited him gave him a bottle of Wild Turkey – that’s bourbon for you non drinkers – as a thank you gift. A bunch of us went back to a meeting room that had been set up for everyone to get chatty over a few cocktails. For those of you who don’t know Herb, it doesn’t take much work to engage in any kind of conversation with this icon.
They raffled off a copy of Herb’s book, “Nuts,” the inside story of how the people at Southwest has made their so successful – 125th straight dividend recently I believe. I won the book and walked up to receive my gift and have Herb sign the volume.
As I approached him, I just suddenly got nervous. Sounds crazy but I didn’t know what to say. Here’s this icon of the airline industry, a man who arm wrestled someone to settle a business dispute and I froze up.
So I said the first thing that came to mind. “Hi Herb. Sure looks like that bottle of Wild Turkey is going to waste.” He looks at me and smiles and then takes another drag on his cigarette – the Northwestern folks were really upset with him about his smoking too. “You know, you’re right,” he says to me. “What’s your name?”
I tell him and Herb grabs the bottle of Wild Turkey, puts his arm on my shoulder and yells to the crowd, “Hey everybody. My friend Rob and I are going to crack open this bottle. Who’s going to help?”
Suddenly we had plenty of friends. That’s just the way Herb is around people. My guess is he’s like that as a boss too. There are too few like him though. Say hi to Herb if you meet him.
How a story for two from some of you about the people you’ve met along the way? I’ll bet there are plenty of people who would like to hear about more of our industry influencers. Was it your flight instructor, a school professor, a neighbor. Tell us.
Happy Thanksgiving everyone.
Technorati tags: Southwest Airlines, Herb Kelleher, Jetwhine, Robert Mark, Northwestern University, Nuts