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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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Artificial Intelligence: The Perfect Pilot?
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On the eve of the Paris Air Show, Boeing announced its next step in developing an autonomous airliner. With artificial intelligence (AI) making the decisions of a perfect pilot, said a number of different sources who covered the Boeing media session, the initial experiments will fly simulators. Because Boeing will conduct further experiments in a real, live, flying airliner next year, my guess is that the sim flights will be final confirmation of existing AI technology.
Reading the various reports of Boeing’s announcement, the Seattle Times’ report was the most thought provoking. Acknowledging that the technology for block-to-block flights already exists, the aerospace reporter, Dominic Gates, said the AI challenge was considerable: “Think about a machine that could do what US Airways Capt. Chesley Sullenberger did in New York City in 2009.” And he posed other challenges the AI perfect pilot might have to address, such as diverting a flight in response to a passenger facing a medical emergency.
There’s no denying the challenges the AI programmers face, but if they orphan the emotional cousins of ego and hubris, they will achieve their goal and aviation AI has a better than even chance of success in achieving a perfect pilot safety record. (The aviation pros I feel for will be the technicians who maintain these systems, because the onus of safety will be largely on their shoulders.)
I’ve never had the honor of meeting Capt. Sullenberger, but judging him by his decisions that day, he is an uncommon aviator who ruthlessly deals with conditions and situations as they are, not as he might hope them to be. Drawing on his knowledge of aircraft performance, his altitude and position, and an uncountable number of other factors, he turned final approach to the best option available to him. There’s no reason to believe that AI’s decision making in similar circumstances wouldn’t be as logically pragmatic.
The AI outcome for a medical emergency could be even better. After the flight attendant conveyed the particulars of the passenger’s medical emergency to AI cockpit, the perfect pilot, which always knows exactly were it is, would quickly search some database for the nearest airport served by the hospital best suited to deal with it and then notify everyone involved of what was needed when and where.
When this system is certificated, I would happily fly with an AI perfect pilot, but only if the airlines change course on their coach class accommodations. After reading Paying the Price for 8 Days of Flying in America, I have no doubt that if this ever happens, it will be ages after AI’s perfect pilot took its place at the pointy end of the winged cattle car. — Scott Spangler, Editor.
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Father’s Day 2017
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Micah (R) with his pop Father’s Day is special to me for a couple of reasons.
My own dad is gone, but of course I’m a father myself so it seems like the idea’s certainly living on in our family.
But my talented buddy Micah – you might know as our Maine Man from the Airplane Geeks – sent this to me a few weeks back and asked if I’d like to give it a listen. I did and realized it’s absolutely worth sharing with other folks whose own pops, dads, or fathers have passed on, because Micah’s sense of story telling is worth spending a few minutes of your Father’s Day on.
Here’s Micah’s piece called My Six-Foot Father.
Happy Fathers Day everyone.
Rob Mark