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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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It’s not all about the guys in Brazil
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As I look back at nearly two months of captivity for the two Excelaire Legacy pilots in Brazil, I’m beginning to feel a bit like Alice in Wonderland when she said, “Things just keep getting curiouser and curiouser.”
Certainly that Joe LePore and Jan Paladino have been unable to leave the country smacks Americans in the face like a bucket of cold water.But there is much more to the story behind September’s midair collision over the Brazilian rainforest than the holding of these two Americans as many of you from South America and other parts of the world have been good enough to remind me. (And BTW, there is no need to apologize for sending private e-mails with information rather than posting directly to this blog. Please continue to update us as you learn more)
Despite the flurry of technical discussions in the aviation press, many of you may not realize that outside of the aviation industry, few people even realize these two guys are still in Brazil. With other things going on in the world too, there are plenty of people who don’t care either. (more…)
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Joe and Jan are getting some attention on Day 57
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Convincing the Fox Network News people to give me five minutes of air time this past Thanksgiving Day to talk about Jan and Joe was a good beginning. And for that, they have my thanks.
While I do wish we’d focused a bit less on the accident and more on the two pilots themselves, we did get the media to sit up and take notice. We must all realize though that outside of our industry, few people realize these two men are still being held. My straw poll at Thanksgiving showed that 12 out of 12 thought those guys were already back in the states.
That makes our job pretty clear. I’ve been in touch with the staff people of the incoming Democratic Senate Majority Whip, Dick Durbin, who have promised to get Joe and Jan on more people’s radar. NBAA president Ed Bolen wrote a letter to the Brazilian president last week asking for the release of the pilots. There has also been a considerable amount of chatter on the NBAA message board about these two. AOPA president Phil Boyer wrote to Secretary of State Condoleeza Rice also calling for an end to the pilot’s pseudo incarceration. As pilots, the natural question is, “What can I do that will truly make a difference?” (more…)
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Few thoughts of Thanksgiving in Rio
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As Day 56 dawns, Joe LePore and Jan Paladino are spending Thanksgiving in Brazil. The two have been under virtual house arrest since the late September mid-air collision between their Embraer Legacy jet and a Gol Airlines Boeing 737.
While fully admitting I am no diplomat – and few pilots I know truly are – some have tried to frame this crash as something criminal. But a search for crimes, as well as the criminals some think are responsible, is simply reprehensible to people from any country.
The crash between these two aircraft was a horrible, life-ending accident plain and simple. That’s a civil aviation safety matter and one that is deserving of all the time necessary to discover precisely what happened. We need to learn what occurred in order to prevent it from ever happening again. (more…)