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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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Adding More Bold Opinions
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When I created Jetwhine wayyyyy back in 2006, the tagline was pretty simple … “aviation buzz and bold opinion.”
Since then, some 650 stories of fact and aviation opinion have appeared on these pages. Some of them have have driven readers simply crazy, like some we’ve written about air traffic controllers and the FAA for instance. Some haven’t raised so much as a speck of dust anywhere. But that’s life.
The stories written by our editor Scott Spangler though are often much more controversial than mine. The difference of course is that Scott’s style is so smooth that he makes his point without seeming to point fingers in people’s faces. I’m still hoping he can teach me that trick.
Now as we enter 2014, I think it’s time to add a new element to Jetwhine … more audio.
Today we’re rolling out Episode One of The Aviation Minute.
These podcasts (scroll down) are designed to briefly capture the essence of a single topic. They’re also designed to create enough interest for you to seek more information on your own. It’s the only way you’ll ever stay informed on the ever changing world of aviation. And let’s be serious … this is not the aviation world I came into when I soloed a Champ in 1966 around the patch at Champaign Airport, IL (CMI).
Our first show is devoted to the pilot shortage. And if I stay on top of things, we should have a brand new episode each week that tantalizes you just enough on one topic to make you think.
And of course, I also hope these will someday bring my delivery up to the standards of Scott Spangler … but I still have a way to go.
BTW, we’re always on the lookout for fresh topics that we should keep an eye on. Some of the best of the best have been suggested by you our readers … and listeners now. So please feel free to send along your ideas and comments to me … [email protected].
For those of you who have come to expect complete technology savvy shows, let me mention there will soon be a separate RSS feed and iTunes account to subscribe to only The Aviation Minute should you choose. More on that soon.
Enjoy,
Rob Mark, Publisher
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Can Collective Effervescence Save Aviation?
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If curiosity got you past the headline, stick with me for a few more words for an idea that might help save general aviation. If you’ve attended EAA AirVenture Oshkosh, even for a day, most likely its passionate enthusiasm dispersed a year’s worth of bad vibes about aviation’s future possibilities.
AirVenture has been my annual aeronautical antidepressant for the past 35 years. Over that time I and many others have tried unsuccessfully to explain why. I’ve finally found the answer in a National Geographic story, Karma of the Crowd, about the world’s largest religious festival. For the millions who gather in India at the confluence of the Ganges and Yamuna rivers, psychologists attribute the mental boost the to “collective effervescence.”
Émile Durkheim, a French sociologist, coined the term in the 19th century, said National G. In the future, around the time of Star Wars, people might call it the Force. In the current epoch of technology, I’d call it crowd-sourced and shared behavioral synergy. Regardless the term, researchers studying its emotional and spiritual benefits say it is more effective and long lasting than prescription antidepressants. And the only source seems to be a crowd united for a common purpose.
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Last Words: Charlie Victor Romeo
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Like moths seeking illuminated warmth, pilots are genetically drawn to aviation accident reports. Most say they pore over them to perhaps discern details that might keep them from ending up as the subject of their own accident report. As they read, I’m sure many have unspoken, fleeting thoughts similar to mine…Facing the same situation, I’D never do that!
Such thoughts are easy when reading the detail of an accident because we hear them in our individual intracranial echo chambers. Unless we’ve faced impeding doom, I’m sure the voices that play the different roles carry none of the original emotion, especially when reading the transcripts from a cockpit voice recorder, which by its phonetic initials is Charlie Victor Romeo, the title of a new 3D adaptation of a play first staged in 1999.
The film is now playing in New York and LA. It is listed on Netflix but is not yet available. After watching the trailers, which focuses on a snippet of the DC-10 arrival at Sioux City, one of the six airline accident CVR recitations, I’m not sure I want to. The presentation is all too real because the actors perfectly embody the focused and controlled pilot voice Tom Wolfe wrote about in the opening pages of The Right Stuff.
Watching these gripping snippets introduced a new voice—my own. Too many aviation tragedies are still the unintended results of decisions made by those involved. No matter how many accident stories we read, pilots still run out of gas, push the weather, and lose control of the airplane at low altitudes. We can find solace in the delusion that we’re immune to bad decision making, but how will we react in a situation with fatal consequences not of our own making? Will the CVR record a legacy of focused intent and composure? — Scott Spangler, Editor