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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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A New Union Marketing Strategy, Hire a Republican
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It’s Labor Day again and some fresh thinking is long past due.
Everyone knows the American labor movement has fallen off the edge of a cliff the past few decades and even a blue president isn’t going to be able to fix it all. The big question is why labor has dropped off the radar of most young people. I’d venture to say that if you asked folks in the 20-40 year age range their views on unions, they’d probably growl at you.
We don’t even teach much about the labor any longer and we seldom see much in the media either. Except for the Boeing strike a few months back, think about the last time a major labor organization made the press. And let’s be serious, a strike means everyone stopped talking anyway, hardly a great example of solid labor/management relations.
But why?
I think the major reason unions have fallen into disrepair is not because people don’t think decent wages and a good working environment are valuable. The real problem is that we’ve all been so indoctrinated into believing that we have no power to affect change that most see little reason to make a stand. If working conditions were awful, people just left to find another job, something that’s not so easy now.
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Stuck on an Airport Ramp? – "You Can’t Fix Stupid!"
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For some time, I have stood firmly on the side of the people who believe a law is needed to keep airline passengers from ending up trapped on the ramp inside an airplane for hours at a time. But I think I’m starting to be swayed. Part of my ambivalence is related to a number of industry folks I’ve spoken to over the past few months.
First, my bias.
I’ve only been held captive by an airline once or twice. The longest was on American Airlines at Tampa trying to get back to O’Hare when traffic delays to that hub were still a persistent nightmare. We sat over four hours before ATC waved the green flag to go. The APU was running so at least we didn’t roast, but the airline was pretty stingy with everything else.
Why DO they treat people like that? Anyway, at the two hour point, some passengers became more than restless. By hour three, they wanted off and American obliged as they marched off the aircraft with carry-ons in hand.
Everyone is not always lucky enough to have the option to leave however. There was of course the regional jet stuck at Rochester MN and the Sun Country jet stuck at JFK for 6 hours last week to keep the issue alive. All really seem to smack of some airline employee making some pretty stupid decision that ignored the people who pay the bills, the customers. The result? Some people are demanding a passenger bill of rights to force the airlines to treat people humanely.
The Air Transport Association’s David Castelvetter told me, “It is perplexing how these incidents continue — yet they are rare. In June, 42 out of 557,594 flights were delayed more than four hours.” Little comfort, I’d note, if you’re on one of the 42 airplanes. “There is a renewed focus on this issue, honestly — the focus never waned, however clearly we need to do more,” he added. But what to do? Sun Country recently put a rule in its pilot operations manual that leaves no doubt about what action should be taken when. I asked David if many other carriers had these kind of rules in place. He said he’d not heard of any others.
But why not. Adding a rule seems so simple.
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Jet & ESA Fly From Sonex Hornet’s Nest
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At EAA AirVenture Oshkosh, Sonex Aircraft pulled back the curtain on its research and development department, called the Hornet’s Nest, and unveiled three projects it’s been working on for the past handful of years. One of them the E-Flight Power System, was covered in a previous post (Old Fashioned Focus Sustains Sonex), but there were two surprises. One was the SubSonex jet and the other was the Onex (pronounced One-X), a single seater. Given the breadth of information Sonex shared on my recent visit, this post will look at the turbine and electric airplanes. I’ll serve up the Onex next week.
Sonex is not taking orders for these R&D projects, and it does not have any concrete information on price or availability. That information will come in time as the projects mature and there’s a proven demand for them. Sonex will post updates on its Hornet’s Nest website. “Each project airplane does not compete with current products, but all of them adhere to Sonex themes of affordability, simplicity, versatility, performance, quality, engineering, and ease of maintenance,” says CEO Jeremy Monnett.
With an impish grin, Sonex Founder and Chairman John Monnett, standing next to the jet’s single-seat cockpit, pleads guilty to a bit of carbon trading with the SubSonex, drawing a lifetime of making efficient airplanes leading up to the E-Flight Sonex. “It’s been my pet project since I first saw the BD-5J in the 1970s.” Only now, with the development of a new generation of small turbine engines has it entered the realm of affordable.