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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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First Annual Aviation Blogger Summit
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I’ve just returned from the first international aviation blogger conference held in a luxurious downtown Chicago hotel overlooking Lake Michigan, not far from where Mayor Daley destroyed Meigs Field (CGX) just a few years ago.
Conference attendance was light – there were only two official bloggers and two completely attentive audience members. One left before the end to catch an early flight back to the U.K. too. The numbers were small because the other blogger and I just cooked up the whole idea a few days ago.
The U.S. aviation blogging world was represented by me from Jetwhine, while the entire European theatre blogging perspective about flying was held together by Norman Rhodes a Triple 7 captain for a major airline and the man in charge of The Digital Aviator.
I must confess, I’d still like to steal that URL for myself, but I doubt Norman is going to part with it. I’m also envious of the photography this man uses. If you haven’t been to the Digital Aviator yet, stop now and click here … then come back of course. (more…)
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Aviation Blogs … They’re Not Your Dad’s Newspaper
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I was thinking about blogging as I tend to do these days with the first anniversary of Jetwhine approaching. What makes blogging valuable to those of us in the aviation industry is the direct link we offer between the writer and the reader, something few other media sources do.
For instance, if you’d read the Boston Globe the other day, you’d have read their editorial – Fly the Miserable Skies – a story that tries to make readers believe that if the fat cats took their big fancy Gulfstreams out of places like Logan, the airlines would have more breathing space.
And to encourage this habit of avoiding hub airports like Logan,
the Globe thinks business aviation user fees might be a pretty sound idea, not to mention that they’ll help offset the massive debt FAA wants to take on to rebuild the nation’s aging ATC system.
Of course, the Globe’s editorial staff doesn’t seem to be aware of how tiny the percentage of business airplanes is relative to airline flights, or the fact that the tiny user fees being bantered about right now for biz av will do very little to finance a new system.
So what does this have to do with blogging? (more…)
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Dear FAA Administrator … Have You Met Martha Stewart?
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After the Koz Convention drew hundreds of political pundits to Chicago for a weekend’s blogging about the U.S. political climate last month, the Daily Koz, Markos Moulitsas’ blog of political intrigue and corruption, ran a piece about our favorite FAA administrator, Marion Blakey.
One of Koz’s contributors – the Blue-Eyed Buddhist – wrote a piece that made me realize there are plenty of other folks who think FAA gets away with much more than we know.
All the facts about a corrupt little deal at the agency were right in front of us last week and most of us simply failed to put them together the way BEB did. At least if anyone else did see them, I didn’t hear anyone else yelp, me included. I just have to get out more!
Blakey was recently appointed as new president and CEO of the Aerospace Industries Association and grabs the reins sometime in mid November. AIA is the trade organization representing dozens of major aerospace companies around the world.
I was happy to hear she’d found a good job – really. (more…)