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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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Taking Time to Find Aviation Serendipity
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On your way someplace else, how many times have you passed a sign pointing to a small town airport? The more important question is how many times have you followed that sign?
With the potential for unknown delays between the sign and your intended destination, and the unlikely reward of aviation serendipity, of finding something interesting at a small airport in these aviation depressed times, you probably drive on by. Yeah, me, too.
But not this year, or in all the years to follow. Finding something special is worth the minutes it takes to follow the airport sign and make a drive-by inspection. If there is nothing that captures my curiosity, I’ll be on my way. But if it is taken prisoner, what else can I do but surrender to it?
A visit to the municipal airport, with a single 4,400-foot runway, that serves the 11,639 residents of Urbana, Ohio, planted the seed for this change. Had I been traveling and not touring the National Aviation Heritage Area, I would have missed something truly unique, the Champaign Aviation Museum, which calls this small town airport, also known as Grimes Field, home.
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It Takes a Community to Promote Aviation
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Promoting aviation to ensure its future viability and growth is something important to most of us who are involved with it personally or professionally. Individuals and organizations have promoted and pursued programs dedicated to inviting newcomers to the fold, and the results have often fallen short of those promised. Yes, there have been a number of one-on-one success stories, but the challenge is making this successful personal approach work on a larger scale.
The Raisbeck Aviation High School, a leader in science, technology, engineering, and math education is a worthy model for all to consider because it unites aviation’s many communities in pursuit of a common goal. Founded and operated by Highline Public Schools (District 401), RAHS serves 27 different school districts in the Washington’s Puget Sound region.
Its campus is located at Boeing Field’s Museum of Flight, making it the only aviation themed college-prep school that shares resources with an aerospace museum. And it receives an inspirational assist from the 200 or or so aviation related businesses that surround the school. But it goes beyond that, said Steve Davolt, RAHS’s coordinator of work-based learning. “Mentorships and internships have been an integral part of the schools since it was started 12 years ago.”
Mentorship pairs an RAHS student with an area aviation professional, he continued; both individuals make a one-year commitment, but many of them continue three or four years, until the student graduates. Every summer, nearly half of the 425-member student body participates in a 10-12-week internship, 60 percent of which are paid.
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How Deep is Your Aviation Knowledge?
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With the approach of December 17, which every airplane geek holds dear as Kitty Hawk Day, the birthday of powered flight, a brief quiz to probe your aviation knowledge beyond this momentous event.
The questions come from Aviation Trail, a member of Dayton’s National Aviation Historic Alliance. Answering these questions during the Aviation Writers Summit in Dayton earlier this year I was able to answer most of them. But a handful introduced me to new and fascinating aspects of aviation that inspired further study—and appreciation—of aviation’s contributions to the larger world. Enjoy! — Scott Spangler, Editor
1. How many Wright siblings were there who lived to adulthood?
2. What were the careers of the Wright brothers before they started building airplanes?
3. Name the first African-American to have make a living as a writer and why he was significant?
4. How did a rectangular inner tube box inspire Wilber Wright?
5. How many flights took place at Kitty Hawk on December 17, 1903?
6. How long was the first flight?
7. Where was the Wright Company Flying School, and who was one of its famous graduates?
8. Why did the Wrights chose Kitty Hawk for their glider test site?
9. Where is the original Wright Flyer displayed?
10. Other than the airplane, name five major Dayton inventions (among thousands of all types)?
11. Which Wright brother was from another state, and which one was the first to fly?