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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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FAA InFO Translates Canadian ATC Lingo
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In an attempt to keep current with all aspects of aviation, I subscribe to all manner of e-mail updates. In this arena, the FAA is prolifically focused. My latest discovery is the InFO, short for Information For Operators.
Produced by the FAA’s Flight Standards Service, these notices contain “valuable information for operators that should help them meet certain administrative, regulatory, or operational requirements with relatively low urgency or impact on safety.”
Initially, the idea of focusing on one difference between US and Canadian ATC phraseology might spark a giggle. After all, isn’t English the official language of aviation? How different or confusing could the phraseology used to issue a standard terminal arrival be?
George Bernard Shaw, an Irish playwright and journalist, indirectly answered this question when he wrote that the English and Americans are “two peoples separated by a common language.” Having reported several stories about Canadian aviation, I’ll second this with a hearty Roger THAT!
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Why Southwest Grabs My Business, Again and Again
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Word of Mouth marketing (WOM) is a bit like the Superman of campaigns. Nothing can stop it. That’s because the company the campaign focuses on has little or nothing to do with the effort. It’s all customer driven. People recommending products they love straight from the heart — with no interference from the marketing folks — can easily make a product go viral.
But a bad WOM is equally tough to squelch, often generating reputationally-treacherous stories like the ones many U.S. airlines are often party to. Remember United Breaks Guitars (viewed 11.5 million times so far), or the Top 10 Reasons the Northwest pilots missed Minneapolis?
To me, WOM really comes home when I think of Southwest Airlines, the brainchild a few decades ago of Herb Kelleher and Rolin King. I tell people that I fly American and Southwest almost exclusively, but if Southwest Airlines flew to all my travel destinations, they’d corral all of my business, despite the slightly longer drive to MDW. Why? It’s so simple … flying Southwest I mean. (more…)
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Then & Now Explains Present With Past
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If there’s a poster child for the public’s misunderstanding of the physics of flight, it has to be the stall. Every time some poor reporter in print or on TV, who hasn’t dug deep enough, relates it to the airplane’s powerplant, haven’t we all shaken our heads and thought less than nice things.
So, my smug aeronautical compatriots, let me ask you this. Who first used stall in an aerodynamic sense, when was it first used, and whose flying inspired it? If you know the answer, you’re either a dedicated aero-trivia geek without a life, or you’ve read Then & Now: How airplanes got this way, Phil Scott’s new book, published by Sporty’s Pilot Shop.
It’s a quick, enjoyable, and enlightening read without being oppressively didactic. Its 94 pages are divided into 13 chapters and three “Literary Intermissions” that consider 1911’s take on “The Aeroplane—Past, Present, Future,” the life of an aviator’s wife in 1920, and Harriet Quimby on “How a Woman Learns to Fly.”
Scott’s student pilot days, when he was a college student in Kansas, are a thread that unites the chapters that reveal the genesis of the airplane’s physical structure, from wings and their stacking, wheels that found a hiding place, the cockpit and its fuselage home, how airports and flight training happened, and how the aeronautical lexicon grew.
It’s a read any pilot is sure to enjoy, but I’m biased. Phil is one of my favorite writers. From his first book, The Shoulders of Giants, about those pioneers, like Sir George Cayley, whose work led to the Wrights’ Kitty Hawk success, his captivating prose never fails to elicit smiles.
Oh, if you’re still wondering about the stall, it is on page 11, in Chapter Three, “Speaking our Language.” Wilbur used it in a 1904 letter to Octave Chanute. Discussing one of Orville’s flights, Wilbur wrote “after about 200 ft. he allowed the machine to turn up a little too much and it stalled.”
I could go on about the stall-spin accident, auguring in, and buying the farm, and all the other fascinating bits in the book, but I don’t want to spoil your fun of discovery. — Scott Spangler