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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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A Future View of UAV Safety & Surveillance
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The 1.8 gigapixel looks at 20 square miles at once.Comments on last week’s post on UAVs focused on safety and privacy, and rightly so. Most offered valid examples of why UAVs won’t work today, and I won’t argue because I agree. At the same time, I can see how UAVs will safely integrate with populated aircraft in the not too distant future. As for the privacy concerns, watch the video, and then we’ll talk.
The 1.8 gigapixel ARGUS-IS sensor is impressive, isn’t it. Imagine, a 20-square-mile view with the ability to focus on objects as small as 6 inches in 65 different windows while not losing the larger view. Each UAV equipped with this system streams a million terabytes of data, equal to 5,000 hours of video, a day.
It sounds threatening and scary until you think about who’s going to watch it. Don’t give the government too much credit. It’s as disorganized and dysfunctional as any civilian operation. I’m sure the government workers at all levels only wish their technology was as cutting edge and capable of finding and displaying needle in the haystack aerial surveillance video in any multiple of the time it takes in the movies.
As for safely integrating UAVs into a sky filled with populated planes, remember one word: NextGen. Yes, I know, it is not yet fully operational and it has its problems, but like the antiquated ATC technology we now depend on, engineers will work all the bugs out NextGen.
If you dig into the NextGen systems that keep everyone from bumping into each other in positive control airspace, it’s easy to see that the only real difference between a populated plane and UAV is where the pilot sits, cockpit or cubicle. — Scott Spangler, Editor
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Move Past LaHood … and the Sooner the Better
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Sometimes the best action is to take none, which is precisely the route I chose last week when many people were falling over themselves to tell outgoing Secretary of Transportation Ray LaHood how much they appreciated his past four years on the job. No criticism on my part for their actions though. Industry groups do what they have to do to operate successfully in DC.
Me, I’m just glad LaHood is on the way out. LaHood was an Illinois Congressman before President Obama plucked him off the Hill in 2009 to watch over the transportation industry. His transportation experience at the time … service on the House transportation and infrastructure committee.
While LaHaood was awash in accolades last week for his consumer work, I’d suggest everyone take a deep breath and look at the record. The consumer protections of the Don’t leave passengers sitting all night on an airline ramp without food or water Bill actually evolved because of the lobbying efforts of one lady mostly — Kate Hanni of Flyers Rights.org, not Mr. LaHood. And to credit LaHood with a win because delays are down is beyond silly. Overall air traffic is down nearly 30% since 9/11 for starters. Then of course, the flyers rights bill convinced airlines it was easier to cancel flights when the weather threatened, also leading to less traffic. LaHood had nothing to do with any of that.
And let’s not forget his brilliant Future of Aviation Advisory Committee (FAAC) in 2010, designed to provide leadership and vision to the industry. Great PR for the Secretary, but tell me what the work of all those experts actually accomplished? Our president still thinks business airplanes are toys and should pay accordingly. Thanks for that Ray. And as to that recent FAA reversal of strategy on Boeing’s 787 — first the airplane was safe, but in need of a top to bottom certification review and then a week later the airplane was grounded because it wasn’t safe? Those moves didn’t come from FAA. They had LaHood’s fingerprints all over them.