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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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J-bot Drones Give Journalists a New View
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Not long ago, the periodic newsgram from my alma mater reported the birth of a new course at the University of Missouri School of Journalism, Science Investigative Reporting/Drone Journalism. The nation’s first J school, now more than a century old, has always been forward thinking, so it didn’t surprise me that the course was part of the University of Missouri Drone Program, a collaboration between the J school, MU’s information technology program and its Drone Lab, and the College of Agriculture, Food, and Natural Resources.
Being J-schoolers, three seniors in the program launched a blog, The Missouri Drone Journalism Program. It tracks their progress in the class taught by Bill Allen, an assistant professor of science journalism. The three bloggers, Jaime Cooke, Zach Garcia, and Robert Partyka, write about more than learning to fly the camera-equipped J-bot drones. This is the Missouri J School, which means students learn not only how, but why and what’s legal when and where.
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See and Avoid: Airplanes and Partisan Politics
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Since the FAA issued the list of contract towers it will close to satisfy the self-inflicted sequester, I’ve been reading a lot of wailing and gnashing and incredulous screeds of how could they? Common to everything I’ve read so far is the pointy fingered whine of put-upon victims. Let’s get real here. We got what we voted for. All of us.
Our elected officials—all of them—embody the ideological narcissism that has, over the past three decades, grown bitter in many of us and turned America’s future into a zero-sum game. If one side can’t win, it will do its upmost to guarantee that the other side will lose. We gave them power—we encouraged their behavior—every time we voted, every time we raised our fist in support or condemnation of candidates who promised to govern in our best interest but only answer to and serve those who finance their duplicitous endeavors.
Before air traffic controllers took to towers to help pilots make their way to and from airports safely, we all learned that as the pilot in command, we alone are ultimately responsible for the safety of our flight, to see and avoid other airplanes that could compromise this sacred responsibility, something we all too eagerly surrender to others, whether they be in an air traffic control tower or an elected office.
If we’re not happy with the world we have created with our votes and political support, only we can change it by seeing and avoiding those who have done our bidding and brought us to today’s place in history. Changing course, if that’s what we as a collective whole really want, will take time. We didn’t create this problem overnight, so we will not rectify the situation as quickly as we might like.
Time will tell if we have the gumption to summon and sustain the unified focus and the willingness to sacrifice in the name of compromise because we accept that in zero-sum situations, we all lose. In the meantime, let’s stay safe out there. As we should when flying to and from any airport when VFR, we should have our heads up and rotating, systematically searching our surroundings for traffic on an unfortunate trajectory. (This essential see & avoid maneuver should work as well when it comes to those who want to serve as our elected officials.) And if it’s been awhile since you’ve flown to a nontowered airport, before you fly, add this to your preflight planning: Aeronautical Information Manual, Section 3—Airport Operations. — Scott Spangler, Editor
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Pilot Population & Demographic Stability
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Most pilots know that the test of an airplane’s dynamic stability is to trim for a specific hands-off speed, increase or decrease pitch to a faster or slower speed, then let go of the stick and measure the time it takes to resume the hands-off speed. It’s my contention that seeking its demographic stability is what the U.S population has been doing since 1980, when it peaked at 827,000 active aviators. That also happens to be the year that the last Baby Boomers, born in 1964, became old enough to solo.
Working in round numbers, the first of 76 million Baby Boomers were born in 1946. They were old enough to get a private certificate in 1963. I wasn’t able to find the number of active pilots that year, but it probably wasn’t much more than 1964’s 431,000. Certainly, we Boomers aren’t the sole source of the rapidly increasing population, but as were in other facets of the American demographic landscape, we were the dominant variable.
As we came of age, the pilot population blossomed like flowers in spring. By 1969, when Boomers ranged in age from 23 to 5, there were 720,000 pilots. Over the next decade the population climbed in five-figure steps to its peak in 1980, when they ranged from 36 to 16. The decline that started then is, most likely, the retirement of pilots of the Greatest Generation, born between 1901 and 1924, and the so-called Silent Generation, born between 1925 and 1945.
And now it’s our turn. Until 2005, given a point or two fluctuation, Boomers accounted for more than half of the pilot population. That changed in 2006, when the first Boomers turned 60. After our self-inflicted economic melt-down, the Boomer’s representation fell to 43 percent of all pilots. In 2011, it was 40 percent. With 8,000 of us turning 60 every day, and the uncertain financial world in which we one day hope to retire, I expect this trend will continue with increasing speed.
Where the pilot population will find its demographic stability is anyone’s guess. Looking at the succeeding generations and their financial futures and opportunities, my guess is 300,000 or less.