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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: Episode 8 – TSA PreCheck
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RSS FeedI can’t believe I’m going to say something nice about the TSA again. That’s twice in a couple of months.
I do think it’s worth mentioning that the TSA has actually created a product with value in their new TSA PreCheck card, part of the DHS’s Global Entry system. Of course there is just one tweak I think it needs desperately. Give a listen and tell me if you agree.
Rob Mark, Publisher
If you’re receiving this via e-mail, this link should also take you to the program.
If you’ve missed any back episodes of the The Aviation Minute, you’ll find them here in our archive.
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For Boomers, Rusty Pilot is Difficult Decision
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Since I learned to fly in 1976, the vicissitudes of life have removed me from the cockpit and later returned me to the left seat. As a rusty pilot, I am again at a point where my return to the sky is possible, but deciding whether to take advantage of the opportunity isn’t as simple as it was 20 years ago.
At 40 I was halfway to my expected expiration date. When it came to planning for retirement and related concerns we’ll all face in the final chapter of life, it was easy to procrastinate. At 60 the proximity of what awaits me is clear enough to see without my glasses. I imagine many among the half-million rusty pilots AOPA identified in its research face a similar dilemma.
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The Aviation Minute: Episode 7 – Synthetic Air Traffic Advisories
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RSS FeedPardon our tardiness delivering this week’s episode, but we wanted to wait for our new logo to show up. Many thanks to @runwaygirl’s sister Anne Kirby and The Sweet Core crew for launching us into the 21st Century.
On to the content. This week I’m focused on innovation and the people who create it, like my friend Dr. Dave Byers. A few years back, he figured out how an off-the-shelf radar system might just prevent midair collisions and runway incursions at non-towered airports. He called it the Synthetic Air Traffic Advisory System, or SATAS.
After you give the show a quick listen, stop back and watch the short video of the SATAS demonstration from Sun n’ Fun a few weeks ago.
Rob Mark, Publisher
For those of you who receive Jetwhine updates via e-mail, click here to listen to this week’s show.