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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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As Obesity Grows, FAA Sticks to 170 Pounds
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Living in the land of beer and cheese, I expect Wisconsin to be up there on the list of states with the most obese populations. After hearing reports on TV and in the papers about a new report from Trust for America’s Health, F as in Fat 2009: How Obesity Policies are Failing in America, I wanted to see where my neighbors and I stood.
Obesity rates, measured in percentage of the population, increased in 23 states in the past year, and did not decrease in one. For the fifth year, Mississippi is first on the list with 32.5 percent. Colorado ranks 51st, at 18.9 percent. Wisconsin is No. 25, at 26 percent. According to my body mass index of 30.7, the relationship between my height (6-foot-5) and my weight (259 pounds), I’m just over the line between overweight and obese.
A 2004 CDC report, which studied American height and weight between 1960 and 2002, notes that the average American gained 24 pounds but grew only an inch taller. So, the average male today weighs 191 pounds (with a mean height of 69 inches). Average females are 5 inches shorter and weigh 164 pounds.
In light of this growth, why is the weight of an FAA-standard person still 170 pounds?
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And the Survey Says: Do Airports Waste Economic Impact Data?
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For reasons unimportant here, I look at a lot of airport websites because they are a primary communication channel for anyone who uses or is interested in learning more about them. So I’m on the Airport Information page of the Centennial Airport website the other day, and a large subhead — 2008 Economic Impact Study — catches my eye.
Hmm. There’s a link I don’t ever remember seeing on another airport’s website. After clicking on — and gleefully reading — the treasure chests of information, I wondered if Colorado was the only state that conducted such surveys. Nope. A Google search revealed that most state aeronautic departments regularly conduct airport economic surveys.
So why don’t more airports make use of this information? Or, am I just missing it because it’s buried somewhere in an airport’s website?
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Artful Flying
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One thing you never want to do is give me a book to review. I read them quickly, but often take forever to getting around to telling people what I thought of the experience, which pretty much defeats the purpose of the review … at least from the stance of the author. And I ought to know, I’ve written a few books myself. Tardiness of writing has little to do with the quality of the books I read, certainly not this one.
My cohort in crime Scott Spangler told me about this book – Artful Flying by Michael Maya Charles and Artful Publishing – with the comment that he often finds himself rereading the volume from time to time. Now I understand why Scott spends time with a book he’s already read. After I finished Artful Flying, I realized I’d pretty much destroyed the volume for anyone else because I’d marked the thing up by underlining sentences and using a yellow marker in places to remind me of why I enjoyed a particular chunk of text.
Artful Flying will bust your chops if you’re simply an airplane driver because it talks to readers about the philosophy of flying the way the old guys – and girls – used to do it. No, the physics of flying hasn’t really changed, but the art of flying has, at least in the sense that flying as an art seems to have a lot of its luster over the past 20 years.
Michael Maya Charles talks not simply to how to fly, but how to smoothly finesse an aircraft – any aircraft – with the skill of an airman who is never satisfied with pretty good. An artful flyer is someone who is in the never ending struggle for perfection, much like an ice skater, a painter or even a NASCAR driver.