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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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The Aviation Minute: A Few Memorial Day Thoughts
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RSS FeedMemorial Day here in the United States is one of the days we remember all the men and women who served and perished in armed conflicts around the world since our own Civil War in the mid-1800s.
The stories emerging about how poorly we treat these men and women once we’re through with them though is not pretty. There are some parallels between VA care for vets and our aviation industry. Tell us what you think.
Rob Mark, Publisher — If you’re receiving this Jetwhine post by e-mail, click here to listen … even from a smartphone. Subscribe to The Aviation Minute at iTunes.
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Is Airline Withdrawal a GA Opportunity?
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A recent New York Times story, “Air Travel Economics Make Midsize Hubs Unprofitable“, explained why airline travel today often demands long drives to the nearest major airline hub. This withdrawal of service from outlying communities and hubs makes perfect profit-and-loss sense for the airlines, and it poses an antipodal crisis for the companies whose employees must travel on business, who used to be, it seems, a highly desirable airline customer.
This situation should be fertile ground for the creation of a company flight department, a step many companies of a certain size took long ago. But I wonder if now might be the time for a different kind of flight department, where the employees needing transportation fly themselves in a Cirrus or Cessna. If the employee had the desire, why shouldn’t the company provide his or her training? Wouldn’t this be a win-win for both parties?
Safety would and should be the primary concern and it could be easily managed, I think. Instead of chauffeuring employees, the fly-yourself flight department pilots would provide the initial and recurrent training to the employees who fly themselves. (Naturally, companies that fly jets and other complex airplanes would employ pilot whose job is to fly them.)
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Diary of a New Flight Instructor
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RSS FeedI like hanging around with other flight instructors. Not only do they understand how an airplane flies, but they also know the intricacies of those dark corners of a flight envelope … things that can lead a new pilot down a rabbit hole of trouble if they’re not careful.
Good flight instructors also understand that while a syllabus is a valuable tool to keep both student and teacher focused on the goal … the checkride … instructors must understand the need for flexibility in the process because everyone doesn’t learn exactly the same way.
Dave Pavoni’s a new CFI at Morristown’s American Flyers. We spoke a few weeks ago about why he took the time to earn the rating, as well as what he’s learned about teaching people how to fly and how to keep them flying safely all their lives.
Give it a listen.
Jetwhine podcasts are available on iTunes. Rob Mark, Publisher
If you’re receiving this Jetwhine post by e-mail, click here to listen … even from a smartphone.