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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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Aviation Reality in a Post-Peak World
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Aviation has weathered a number of economic storms in its history, most notably the Great Depression and the collapse of the GA boom that followed World War II. How the industry met and survived past challenges unfortunately will not predict aviation’s future today because one important factor has changed. Instead of climbing the bell curve of available natural and consumer resources, the global economy is, I believe, at the curve’s peak. What’s ahead is all downhill, and how long the resources will last depends on how wisely we humans consume what’s left.
Many debate our arrival at the peak, especially when it comes to oil. Given the growing global consumption and the dearth of easily tapped new resources, we’re certainly on the plateau. And when it comes to the consumer resources–specifically pilots–we’ve been going downhill for some time now, despite decades of industry-wide efforts to find new ones.
Let’s face facts: aviation is shrinking. Not only are there fewer pilots than there were two or three decades ago, there are fewer airlines and manufacturers. Given the recent merger of Delta and Northwest, the distillation of the military-commercial manufacturers, and the tide of bankruptcy now washing up on GA’s beach, it’s time to look forward with a clear eye rather than backwards with a longing sigh.
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New Book Holds Hope for Aviation’s Future
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The only thing that sucks worse than the economy right now is the state of aviation. Mix layoffs with shrinking pilot numbers and the growing list of new regulations and requirements that benefit only bureaucrats, and you have a case of cynicism about the industry’s future.
In living aviation history for the past three decades, and reading about that which I missed, it strikes me that aviation remained vital in the direst circumstances, like the Great Depression, when flying was an adventure that brought people together, and attracted newcomers.
That spirit started fading in the late 1970s, and by the mid-1980s, aviation was a commodity, something you bought when needed, like garbage bags or a bus ticket. People are still part of the equation, but not like they used to be. The people who matter are no longer passionate participants, they are shareholders focused on the bottom line and see the future one quarter at a time.
Aviation’s future lies not with these modern aviators, for whom numbers and the latest gadgets matter most. It is an ember of hope sustained by scattered bands of grassroots aviators, like those Dick Starks writes about in his new book, Fokkers at Six O’clock.
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One Airline’s Version of Social Media: Stop … I Want to Get Off
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Most people will tell you I’m a fairly gregarious person. Even a few might tell you I talk way too much. I’m the guy that wants to introduce everyone to everyone else. But there is one place I absolutely clam up and simply shy away from contact with the outside world – when I’m spending a few hours in the back of an airliner. I really enjoy my privacy. Perhaps I’m expecting too much, but I get kind of nutty when people try to infringe on my personal space on an airplane – all 10 sq. ft. of it – another reason I’m so relentlessly opposed to any airline approving the use of cell phones on board an airplane. Maybe it’s the close quarters or simply the opportunity to sit back for an hour or two and not respond to my iPhone or Twitter accounts.
Now comes word that one airline and I’m sure others, since they typically operate like a herd of sheep, are enthusiastically launching into the social media world with – or would this be against – passengers.
Air France-KLM last week announced what I think is a simply terrible idea to create a social network and web site to alert other flyers about the people they’ll be cooped up with for a few hours, a post that will include their name and a link to their personal profile. They’re hoping this linkup will encourage people to share travel tips, entertainment recommendations and restaurant ideas. I hate this idea, despite being a Web 2.0/3.0 aficionado.