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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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AirVenture Begins with Proactive Effort to Stop Privatized ATC
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Almost everywhere you turn among the hundreds of acres of airplanes and lovers of aviation are subtle (and no so subtle) signs that make it clear that the best way to improve the US Air Traffic Control (ATC) system is to “Modernize, Not Privatize.” It’s a message you can’t miss when walking through AirVenture’s main gate. And if you miss the big sign on the portable Jumbotron, it is on every bin that offers a free copy of EAA Sport Aviation and the show’s daily newspaper, AirVenture Today.
If people were not clear on the details, AirVenture Today included a four-page pullout in its Sunday edition that explained it all, And if you didn’t get the Sunday paper, there were stacks of them at every exhibit space manned by the general aviation organizations behind the effort, EAA, AOPA, NBAA, GAMA, HAI, and NATA.
But the organizations’ effort is even more proactive. There is a squad of 25 sturdy young uniformed adults, each armed with an iPad. With the expanded Wi-Fi network, each iPad has a real-time connection to ATCNotforSale.com, that enables people to immediately transmit their displeasure over the possibility of a privatized ATC system by email, Tweet, and Facebook posting. And if they are not sure of all the myths and misinformation spread about the proposal, the site clears that up as well, starting with a powerfully concise video with Sully Sullenberger.
The goal of the iPad warriors is to get 10,000 people to send their comments to their elected representatives by the end of AirVenture. The crowd of roughly 350 people who filled the Theater in the Woods Town Hall meeting about ATC Privatization — at 1130 on Monday — seriously spanked my skepticism. Usually, at this time of day, the theater is the refuge of the lame and sunstroked, not unhappy aviators looking for ways to save the activity that gives their lives purpose and meaning.
As the host, EAA’s Jack Pelton spoke first, followed by AOPA’s Mark Baker, NBAA’s Ed Bolen, and GAMA’s Pete Bunce. In turn, each of them evenly explained the consequences of a privatized air traffic control system on the the community of general aviators their organizations represented. What united them was the universal threat embodied in the House 21st Century Aviation Innovation, Reform, and Reauthorization (AIRR) Act, aka HR 2997, which includes the provision that would separate ATC organization from the FAA.
Each speaker made it clear that the our elected officials will decide the future of general aviation in the next few months as this legislative bolus works its way through Congress. Its defeat is general aviation’s only hope, and we should achieve that goal if we consistently communicate with elected official with a unified voice. And you don’t have to be at AirVenture to pound out an iPad missive to your elected official. You can add your voice to the 10,000 sought after in Oshkosh at ATCNotforSale.com or through any other form of communication. — Scott Spangler, Editor
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Quiet Skies: A General Aviation Transect of Canada
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On the eve of the Congressional vote to privatize the US air traffic control system, I made an informal, unscientific general aviation study of a nation—Canada—that privatized its system in 1996, when Transport Canada sold its air traffic control and navigation services to a private, nonprofit company, NavCanada. Without getting into the vociferous politics involved, the common denominator for a privatized service formerly provided by the government is user fees.
To gauge the consequences to general aviation, during a 3,057-mile transit of the TransCanada Highway, which began on Canada Day (July 1) at the Abbotsford, BC, border, and concluded at the Ogdensburg, NY, border on July 11, I would keep a sharp-eye pealed for GA airplanes flying within my constantly moving visual hemisphere. And I would explore GA airports that were not too far off the highway and talk to any aviator I happened to meet at them.
I started my survey without expectations. By landmass, Canada is the world’s second largest nation. NavCanada’s website says it manages 12 million aircraft operations annually for 40,000 customers in the 18 million square kilometers (6,949,838.85 square miles) that stretches north from the US-Canadian border to the North Pole and from Pacific West Coast to the North Atlantic, the world’s busiest oceanic airspace, which averages 1,200 flights a day to Europe.
On my Canadian transect, I saw nine aircraft. Four of them were turboprop ag aircraft at work in the prairie provinces of Alberta, Saskatchewan, and Manitoba. On Canada Day, walking back from dinner at Hope, British Columbia, I saw a single-engine prop plane with a long, thin high wing, whose make and model I could not identify. The pilot I saw enjoying a beautiful evening over Blind River, Ontario, was flying a Cessna 172. At the Dryden Regional Airport, an A-Star 350 hovered and landed at the Ontario Ministry of Natural Resources base, and on the other side of the airport, a Metroliner arrived to exchange its passengers. And on my survey’s last day, what looked like a Cessna Mustang business jet was on its final approach to Ottawa, Canada’s capital.