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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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Eating our Young: The Final Flap About NWA 188
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I’ve actually been trying to write this article for quite awhile. It was much tougher than I thought simply because I’m what my wife the psychologist would call conflicted, unsure of where I stood, or at least I was until a few days ago.
If you follow us here, you’ll by now know I wrote a couple of articles on the two Northwest/Delta guys who blew past MSP last October. The Feds quickly decided the best recourse to stem the tide of public paranoia about pilots asleep at the switch was to revoke the certificates of the two cockpit crew members. Surprisingly, even to me, I agreed with the Fed’s decision.
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So what else is there to say you might be wondering if I’ve already decided that hanging these guys out to dry was the right course of action. That’s where social media all took over.
Although the responses I saw to the NWA story weren’t nearly as acrimonious as some of those from my experiences in West Palm Beach, it was pretty clear that many of you thought I’d lost my mind. I won’t mention any names but let’s just say that all of you are people for which I have an enormous amount of respect.
One said I’d turned quite cynical, another reader said I was crazy and wouldn’t have put up with the Fed’s action if it had happened to me while another said he was surprised overall at how quickly we seem ready to throw our brothers and sisters under a bus when they screw up. Actually, I believe he used the phrase “eating our young,” which made the point pretty graphically I’d say.
So here’s the deal. My job as an editor and a teacher is to comb the industry for topics and issues that Scott and I can both react to in a sort of teaching moment, which is of course, pretty convenient since Scott and I both moonlight as teachers. But a true teacher must also be a good listener. They must be open-minded enough to consider the views of others and maybe, on occasion, rethink a few of their own philosophies. In this case, I think all our readers who told me both online and off that I was goofy might just have been right.
But if I were going to rethink the whole NWA188 issue, I’d need to figure out just why I stood with the Feds, which traditionally I’d never do. Hence, the delay of a couple of months in writing this post. And seriously folks, I woke up a few nights thinking about this so I knew it was serious.
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Ground School Delivers Consistent Quality
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Ground school has been—and always will be—the most important part of learning to fly any aircraft. Whether it’s a Skyhawk with steam gauges or a glass-packed Skycatcher, the flying machine itself is just a training aid, the training tool where students practice what they have learned in class.
Despite its importance, the quality of ground school instruction is the greatest variable in the flight training equation. Cessna has removed this variable (at least at its more than 280 Cessna Pilot Centers) with its new Part-141 approved Sport/Private Pilot Course, which went online late last year and delivers consistent, high quality education in a virtual classroom to students when they are in a mood to learn.
Cessna gave us a preview a little more than a year ago (see Next-Gen Challenge: Selling Aviation), but based on the online demo, the company heeded an essential aphorism of success: under promise and over deliver. Half the credit should go to the good folks at King Schools, Cessna’s educational partner, who developed and maintains (or so it seems, given the URL) the virtual classroom.