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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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Exhibiting Aviation’s State of the Industry
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An EAA AirVenture Oshkosh participant every year since 1978, I started spending the week there in 1989, when I began a decade-long tenure as Flight Training magazine’s booth boy. I spent roughly half that time in the old exhibit buildings, now the Federal Pavilion and GE Aviation Learning Center, and the remainder in one of the current exhibit hangars.
To pass the time when not talking to readers, and when roaming the aisles on my breaks, I began to take note of the changes from year to year. In the early years, when aviation was growing and stuffing another exhibitor into the old sheds seemed impossible, EAA built the new exhibit hangars and redesigned the outside spaces. And they quickly filled up.
Over the past three years the signs of an eroding aviation industry have been slight, but this year they were shockingly apparent, especially when I walked into Hangar C. Vast pools of open floor spilled from each of the large doorways. The aisles between exhibitors were maybe a third wider than last year, and for the first time in my memory some aisles were formed by the backside of the other aisle’s booths.
The migration of exhibitors with tenuous ties to aviation from the Flymart to the exhibit hangars has been gradual—and constant. Given the economy and the decline of the pilot population, this trend will surely continue. Some of the products displayed, demonstrated, and for sale were pretty cool, however. My favorite was this electric powered RC model that reminded me of the flying machines in Avatar.
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Oshkosh, the Verb
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Sometimes we bloggers simply talk too much trying to express how we feel about something like AirVenture when simply letting the story tell itself works much better.
With that clever insight in mind, may I present for your review, a few photos that made me realize what a special place – what a special experience – traveling to this town is each and every year. Hint: It’s the people!
Rob Mark, editor
Airspeed Editor Steve Tupper prepares a special brew at the Sennheiser, Jetwhine, MyTransponder party Thursday night
The week started out a tad wet. Forget tad, it was a watery mess and will surely affect overall attendance figures
Father and son management team — John (l), Jeremy (r) at Sonex Aircraft that won a portion of the Lindberg prize for their electric aircraft initiative
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Checking Out EAA AirVenture—Day 0
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For the decade I’ve lived just outside of Oshkosh, my favorite excursion of EAA AirVenture Oshkosh always takes place on Day 0. Otherwise known as setup up day, this year was little different, all because of the weather.
To say we’ve had a little rain is an understatement. In just July more than 10 inches has fallen, breaking a record set in 1912. Water has always been a problem during the 30-plus years I’ve been tramping around the grounds, but the subterranean system EAA installed in and around the exhibit areas worked great!
That doesn’t help the outlying areas where 10,000 airplanes park and campers numbering into five figures live for the week. The mass arrivals of Cessna, Bonanzas, Mooneys, and Cherokees didn’t happen, and the North 40 was barren on Day 0, aside from a few campers on the high ground at the west end.
But the sun was out all day, and EAA was doing its best to dry things out, so why don’t you take a (silent) walk with me…and end up at the Sonex Aircraft open house for a look at the Hornet’s Nest updates on the SubSonex jet, now a three-wheeler, and the single-seat Sonex, the Onex. If you’d like to take a photographic stroll with me, click more…