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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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Flight to the Edge of Space
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My pal Rod Rakic – better known as Mr. My Transponder – and I were chatting today about his upcoming vacation to Florida, not too far from the Kennedy Space Center and almost in time for the next Shuttle launch. I would do almost anything to be in that visitor’s stand since there aren’t going to be too many more ground-shaking shuttle launches any of us will be able to watch now that the final curtain of the manned U.S. Space program has begun to close.
Then I remembered this video a reader sent me some time back. I’ve been saving it up special for just a drizzly gloomy day like today In Chicago to share it with you. Can’t make the Shuttle launch? How close does this come? It runs 11 minutes, so pop some corn first, but ride along as James May gets a ride in the U2, the world’s highest flying aircraft, now that the SR-71 is gone.
After flying the A380, this would be pretty cool!
Rob Mark
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Visual Distractions Still Affect Flight Safety
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When I learned to fly back in the mid 1970s, the airspace over the LA Basin was pretty crowded. Because of the smog that then reduced the visibility to some degree every day, most aviators were usually quite serious about seeing and avoiding each other.
Then, one spring Saturday morning, I awoke to a rare sight, a clear, sharply focused view of the mountains that form the basin. It was, I thought, a perfect day to fly, and I quickly departed for Eagle Aviation at LGB. My instructor, Kim, didn’t share my enthusiasm. When I asked why he stressed that I keep my eyes peeled for traffic and to fly as defensively as I rode my motorcycle, he offered a grim smile and said, "You’ll find out."
Ground and the control tower certainly seemed to be working a lot more airplanes. The flight to our practice area over the bay was akin to that of a spastic sidewinder rattlesnake as I saw and avoided multiple targets that wandered blindly through the unusually clear air.
All I really learned that day is that I didn’t like flying when you could see the mountains because too many other pilots were so distracted by the view that they spent too much time looking and didn’t put enough effort into seeing other airplanes, like the one I was flying.
Given the reports in the latest issue of Callback, the publication of NASA’s Aviation Safety Reporting System, this is still a problem. What’s changed is that the visual distraction is not outside the airplane, it’s on the panel.
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Brennand Airport: A Work in Perpetuity
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Owning and operating an airport was never one of Ted Vander Wielen’s life goals. But in 1995, Ted says, he learned that Bill Brennand was retiring and selling the airport he built 10 miles north of Oshkosh in 1968. The only party interested in buying the 22-acre Brennand Airport (79C) was a salvage operator looking to relocate his junkyard, and that would never do. Ted learned to fly at Brennand in the early 1990s, and he built a home in the subdivision next door. His backyard, from the lot line to the runway, is maybe 100 feet.
Looking around the Currier & Ives image of the perfect country airport, a junkyard is hard to imagine. A student is preparing the CAVU Aviation Cessna 172 for his solo cross-country. During the summer EAA Ultralight Chapter 41 holds monthly donut day fly-ins. During EAA AirVenture a dozen or so airplanes roost at Brennand for $10 a night, “but we have room for dozens more,” Ted says, nodding toward the mostly grass runway that he describes as “2,500 feet long and 90 feet wide, with a 20-foot asphalt centerline.” Besides a roost, the airport runs a shuttle to EAA, and folks in the subdivision rent rooms and homes.
Roughly 50 airplanes live at 79C. Most of them reside in the 26 hangars that face the runway like soldiers smartly turned out for a Saturday inspection, each of them privately owned. “It was the only way to build them,” Ted says, adding that he set the standardized requirements for size and style, and each of the insulated metal structures are served by natural gas and electricity. There isn’t a chain link fence in sight, and, he says, “the day they tell me I need a fence is the day I close the airport.” It is just one of the challenges that gives all private airports an uncertain future.