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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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Are Tower Controllers an Endangered Species?
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Years ago in another life, I was a VFR tower controller at a number of then really busy airports, Chicago Palwaukee (now Chicago Executive), Chicago DuPage, Chicago Meigs and Miami Opa-Locka.
As a pilot and a newly minted flight instructor, I always enjoyed the chance to chat with student and private pilots who would appear at the base of the tower and ask to come up for a tower tour. We’d talk about the local airport and how they we might all work better together for a faster, safer operation.
Since 9/11, it is much more difficult to visit airport control towers … not impossible, but certainly much tougher.
Now, a move to transform VFR towers into remotely operated ATC facilities might make it even less likely pilots will be visiting tower cabs at their local airport. Indeed, local air traffic controllers could well go the way of the flight engineer … nice to have, but not necessary.
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New Online Magazine Tells GA’s Story
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At Kent State University in Ohio, students hoping for a career in two failing industries–aviation and publishing–have joined forces to improve the future of both by starting an online aviation magazine. Its tag line, “Grass Roots. Blue Sky,” summarizes the content of Stories That Fly. Produced by the School of Journalism & Mass Communication and the College of Technology’s aeronautics program, the website went live May 2.
In the editor’s note, Joe Murray explains the magazine’s mission: “The light of the mainstream media often shines brightly on the jet drivers, millionaires and astronauts. But what most people don’t know is that you are as likely to find them here, at the local airfield…Among them are the freight dogs, restorers, crop dusters, mechanics, parachute packers, blimp and balloon drivers, flight instructors, students, sport pilots, and airfield operators. They all feed their families and love of aviation by living and working around the flying machines that most of us see only as specks in the early morning’s blue sky.”
A pilot, Murray is an associate professor of electronic media, and Stories That Fly started as an academic project, “Grass Roots: Digital Journalism in the Nation’s Birthplace of Aviation.” It was recognized as one of the top 10 innovative U.S. community news ventures by New Voices, a Knight Foundation-supported initiative of J-Lab: The Institute for Interactive Journalism at American University. It tells general aviation’s story in words, pictures, and video submitted by students, professional writers and photographers, and participants sharing the narratives of their lives.
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Corporate Flying is New Pilots’ Career Goals
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After reading reports of faltering flight schools, I wandered over to the Fox Valley Technical College’s aviation campus on the Wittman Regional Airport in Oshkosh, Wisconsin, to see how things were going in flyover country. Not so bad, it seems.
There I met Amanda White (that’s her on the left) and Elizabeth Amweg. They graduated last Sunday, May 17, each with an associate’s degree, a commercial pilot certificate (SEL & MEL), instrument rating, and CFII and MEI. Both come from non-flying families, and both have positive and ambitious goals for their flying futures. What I found most interesting is where that future flies: business aviation.