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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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Become an Airplane Geek for a Day
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Each year since 2006 as AirVenture approaches, I take a minute to look back on the new friends I’ve made through our social media contacts on Twitter as well as here at Jetwhine. The blog is almost four years old, while my “Jetwhine” Twitter account was opened just before AirVenture 2008.
If I look back on any of the new relationships with a bit of extra fondness though, it would be the meet up I’ve had with the Airplane Geeks. I’ve been a closet radio guy all my life, so connecting with people all over the globe each week means something pretty special to me. My thanks to my other Geek buddies, Max, David, Dan here in the states and those two loonies Grant and Steve in the outback down under.
One thing we’ve noticed at the Geeks recently is a real rise in the amount of listener mail, as well as the downloads which of course tells us we must be on the right track. People approaching us to be see if they can be a guest on the show also means a tip of the hat to my comrades for their hard work.
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Independence Day & Fireworks From Above
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One joy of small town living is our ability to watch the annual Independence Day fireworks from our deck when we don’t feel like joining the crowd counted in the thousands. Staged at a riverside park just a bit more than a quarter-mile away, as the Canada geese fly, most of the show blossoms above the trees in multicolored galaxies of color and sound.
Between our ohhs and ahhs, my wife and I somehow started reminiscing about memorable birthday displays on previous July 4ths. The mental movie of July 4, 1974 instantly started playing in my Cranial Cineplex. What made the show—shows, actually—is that I watched them from above.
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Rote is the Route to Prosaic Mediocrity
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Flight instructors who can remember the answers that returned a passing score on the Fundamentals of Instruction test they had to take should be able to tell you that Rote is the first of four levels of learning. If they possess a good memory (or they took the test a few days ago), they might actually be able to parrot its FAA-approved definition: “The ability to repeat something which one has been taught, without understanding or being able to apply what has been learned.”
In simpler, more concise terms: Monkey See, Monkey Do.
Correlation is the highest level of learning. It means you employ all previous learning and make relevant connections to aspects of a new situation and derive the proper response to what one might call a learning experience. In between the first and last steps are Understanding, which is the ability to comprehend or grasp the nature or meaning of something, and Application, the act of using something learned and understood.
Despite claims to the contrary, most aspects of aviation rarely step beyond rote. By not correlating the lessons learned from past experiences to new challenges, we’re bound to repeat our past actions, with the outcome a predictable route to prosaic mediocrity. If you doubt that rote is a contributing factor to more than a century of aviation tradition unimpeded by progress (another name for learning through correlation), permit me a few examples.