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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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Dragonfly Vision & Hungry Midair Meetings
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Like many aviators I appreciate anything that flies whether it’s a manmade machine or product of natural selection. Among insect aeronauts the dragonfly is my favorite. Let’s face it, who wouldn’t envy its ability to rapidly fly from point to point (at speeds up to 30 mph!), make directional changes to the left, right, or reverse with the alacrity that would rip the wings off most machines, and then quick-stop into a motionless hover.
What I didn’t know, until I read “Nature’s Drone, Pretty and Deadly” in The New York Times on April 1, is that dragonflies are “brutal aerial predators, and new research suggests they may well be the most brutally effective hunters in the animal kingdom.” Even more amazing, they do it using a skill all pilots should have learned from their instructors early in training. I won’t bore you with the details of the research (my wife has already suffered for you), but the dragonfly’s mastery of this skill enables them to snatch midair meals with a success rate of 95 percent.
Research attributes this amazing kill ratio to the dragonflies brain, eyes, and wings. It has “an almost human capacity for selective attention, able to focus on a single” bug among a cloud of fluttering insects. Other researchers have identified “a kind of master circuit of 16 neurons that connects the dragonfly’s brain to its flight motor center in the thorax.” In other words, this fly-by-wire insect can “track a moving target, calculate a trajectory to intercept that target, and subtly adjust its path as needed.”
Obviously, this is a skill combat pilots must hone to survive. And understanding the key visual concept that contributes greatly to the success of fighter pilots and dragonflies alike will help civilian pilots achieve the opposite outcome—avoiding a midair meeting, which more often than not happens within 5 miles of an airport the participants are flying toward or have just left.
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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