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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 Middle School Perspective on Aviation
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A judge for “What’s Your Story,” the Wittman Regional Airport writing contest for those in grades 3-12 in Oshkosh-area schools, I feel compelled to share some observations gleaned from the entries I’ve just read. As our future, I found their participation in and perspective on aviation enlightening.
In two categories, grades 3-8 and 9-12, students attending any school in the Oshkosh area were eligible to, “in your own words,” write no more than 500 words of prose or poetry that describe “what makes flying special to you.” A rough sum of the area school districts tallies roughly 15,000 students, with two thirds enrolled in Oshkosh schools.
By the deadline the contest received 44 entries, all but two from Oshkosh schools. The majority, were from middle schoolers in grades 6-8. Only two high schoolers, one male and one female, took time to write. Girls dominated the grade school category 30 to 12. Regardless of grade, their perspective on flight and aviation shunned nostalgia and romance.
For roughly three-quarters of the students, what impressed them most was the pre- and post-flight airport experience. Terminal’s shopping and eating opportunities was a common theme, followed by the security gauntlet and inconveniences of a missed flight. The dearth of words dedicated to the flight itself suggests that to these students it was no more memorable than riding the school bus.
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Jetwhine Tries to Out-Cranky the Cranky Flier
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I’m made quite a career out of whining about the aviation industry, but even I need someone’s shoulder to moan on every so often. As I sit here in a hotel room in Bordeaux trying to get back to the states from France using an American/Iberia code-share ticket, the story of how I g
ot here … and how I’ll get back was simply too much even for an ex-airline guy like me. Imagine my shock when it took four different airline partners to complete one trip across the Atlantic.
Best of all, many of the French aviation unions are calling a strike for first thing Monday … the day I head back to America. Oh goodie.
I knew only one man could help me keep my sanity and explain for whom exactly, airline code-sharing is such a great solution.
I called Brett Snyder … The Cranky Flier. Before YOU book a ticket on an airline partner, you’d better give our conversation a listen.
Rob Mark