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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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Sporty’s Downloads Affordable Videos
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Roaming around the online aisles of Sporty’s Pilot Shop looking for something to keep my head in the sky while the economy has me tied to the ground, I ran across the “Download Center.” Curious, I gave it a click, expecting I’m not sure what. What I found was Sporty’s Flight Training Downloads, a bonanza of affordable flight training information.
Tabs led to the four libraries, including the new What You Should Know Series. In each are files for a PC or a Mac that also work on your iPod or iPhone. All the titles are available on DVD, but the downloads, in most cases, cost less. For example, on DVD each of the 34 Air Facts titles cost $25. The download is $9.95. Most of of the Air Facts focus on piloting challenges — from all types of weather to most things IFR — and how to cope with them safely. There’s a 25 percent discount if you download four or more, and you can download the complete set for $99.
You can preview most of the titles in either Windows Media or Real Time formats before you order. With 640 by 480 resolution, the quality of all the downloads is close to the DVD, and a password- protected download page lets you collect your purchases over time, a nice option, especially when another member of the family wants their turn on the computer.
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It’s a Buyer’s Market for Recreational Flyers
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Until the 1980s, most pilot saw homebuilding as a lunatic fringe. Its stereotypical practitioners were older guys with rough hands and patched jeans rooting around in airport boneyards, looking for a deal. And then a funny thing happened: the production of store-bought airplanes tanked and new homebuilt kits, which reduced the number parts builders had to make from raw materials, delivered more performance for the buck.
The tradeoff was time, the sweat equity needed to build the airplane. And that wasn’t a bad thing, either, especially in the hard economic times of the early 1980s. The nice thing about a homebuilt is that you don’t have to pay for the whole thing at once. You can build it one section at a time, wings, fuselage, tail feathers, firewall forward, and spread out the investment. Consider it a 12-step plan for aviators addicted to immediate gratification.
Economic times are hard again, and recreational aviation — homebuilding, and its younger sibling, sport pilot and light-sport aircraft — is an even more viable fix for one’s aviation addiction. Pilots can still spread their aerial investment over time, and time is still the tradeoff for a beneficial return on that investment. And because times are harder than they were in the 1980s, it’s a buyer’s market as many companies offer new options and deals to keep order coming in the door.
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Max Says "Learn to Fly" … Pass it on
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For writers, any kind of writers, the big league means writing books.
My first foray came 20 years ago when Tab Books – eventually absorbed into the McGraw Hill network – gave me a chance to write about something I held near and dear to my heart, and still do … learning to fly. Called The Joy of Flying, the volume offered folks who possessed nothing more than a keen interest in learning to fly everything they needed to
make the decision. It was a step-by-step guide that spoke to certification requirements, pricing, flight schools and airplanes. The nice part was that the book actually sold quite well for a number of years. I updated JOF in the mid 1990s because the market was there. People wanted to learn to fly.
And I think they still do today.
It might seem a little crazy to be talking about learning to fly when thousands of aircraft manufacturing people are losing their jobs at Cessna, Cirrus and Hawker Beechcraft and aircraft orders are being torn up at an unprecedented rate. There are thousands of professional pilots of of work as well. But although many people think the sky is falling, I believe it’s actually one of the best times to invest in a pilot certificate. And I’m not alone. A pal of mine – Max Trescott – beat me to the punch of rewriting The Joy of Flying again with his own book about learning to fly.
Best of all, Max’s book is available online for free.