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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.
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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Pilot Reincarnation: What Bird Would You Be?
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From time unrecorded, humans have looked up and envied the birds above them. In time we created machines to emulate their various forms of flight. But have you ever given a moments thought to pilot reincarnation and what kind of bird you would be?
I’m not sure why I awoke with this question in mind last Sunday morning, but it was good reason for not getting out of bed until I’d pondered it. Given the omphaloskepsistic (that’s Greek for contemplation of one’s navel as an aid to meditation) nature of my question, the philosophic seagull lifted off first. Following it was the peregrine falcon, the fast and agile fighter pilot of birds; the albatross, ungainly on the ground, but king of long distance soaring; and the owl, a stealthy predator known for silent flight.
Ultimately, I decided on the hummingbird. Unlike machines, it doesn’t seem to suffer the trade-off consequences necessary for flight fast and stationary. With only a muted hum of wings beating at 40 flaps a second, give or take, they magically appear at my backyard feeder. Better than any helicopter ever could, they dart left, right, forwards, backwards, up, and down with precision that any Blue Angel would die for.
And, as I’ve just learned, their precise flight is unaffected by turbulence measured with up to a 15-percent variation in wind speed. Imagine being able to adjust the angle of incidence of your wings independently with every flap, and it it at 40 flaps a second. It would be worth growing the tail that completes the physical structure that would reincarnate me as the ultimate flying creature.
So, pilots reincarnated, what bird would you be? — Scott Spangler, Editor
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Another Big United Customer Service Failure
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I’m glad I never worked in corporate communications for United Airlines, especially since the Continental merger. The calls from outraged customers and curious media types probably never end and it seems to me that United management really doesn’t care all that much what passengers have to say.
The following incident occurred aboard United flight 1061 March 16, on the way back to Chicago from Vegas. It really made me sick … not just this passenger’s story, but how the airline dealt with it. Cue the music … “United Breaks Guitars.”
First a bit of context, lest you think this is only some disgruntled employee’s fictional tale. I know the writer. In fact, Sean and I have know each other more than 20 years since I’m married to his wife’s sister. I’ve known Sean to be an honest guy and a hard worker, not to mention a loyal United flyer for nearly three decades. He really wants to like United.
So imagine you’re preparing to leave Las Vegas on an airplane jammed with business people and gambler party types, some probably fresh from the casinos as he was earlier this week. He was on the way back from a trade show in fact. This is where his words tell the story. (more…)
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Cabin Fever Compiles an Aviation To-Do List
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The older I get the more susceptible to hypothermia I seem to be, which is a roundabout way of saying that I’ve not been out much because many of these Wisconsin winter days have begun below zero. To combat cabin fever, I’ve been cataloging—and appreciating—all that aviation has given me over the past four decades or so. This process revealed a lot that I would still like to explore and experience before I am no longer physically or financially able to undertake such adventures, so I compiled an aviation to-do list and will start enjoying it this year, if it ever warms up.
At this stage of my aeronautical life I’m focused mainly on the people and places that made aviation what it is today, so most of the items on my list are museums that I have never before visited. High on the list are most of the sites in the National Aviation Heritage Area, from the National Museum of the United States Air Force to the Wright home to Huffman Prairie. I’ve been to Dayton, Ohio, a number of times over the previous decades, but always for another reason, and I never made time to visit these sites significant to a subject important to me. This year, I’m dedicating to them and nothing else.
I’ve not yet visited the Planes of Fame Air Museum, for a similar reason. When I was learning to fly my instructor and I touched-and-went at the airport in Chino, California, many times. Focused on the skills I was trying to master, I ended up landing on the wrong runway because my eyes were distracted by the aircraft on display outside. I didn’t feel any better about my error even though the tower controller told me not to worry because of a wind shift he was going to make it the active runway after I landed.
Everyone I know who’s been to what is now the Mojave Air & Space Port tells me it is the place to wander around. It will be interesting to see how much of that is possible with the post-9/11 security requirements. Regardless, it’s still worth a visit because every day counts, as it does in every lifetime. We may not have had the privilege of being anywhere during its heyday, but we can still get a sense of the place by combining the words of those who were with the stage on which they acted.
There are, of course, many more historic sites on my to do list. Some are physically significant, like Blimp Hangar B at Oregon’s former NAS Tillamook, the world’s largest clear span wooden structure. The others are less well known, like Nebraska’s former McCook Army Airfield, where World War II B-17, B-24, and B-29 crews underwent final training before flying to overseas combat. Like the men who trained here, a few of the buildings they brought to life still survive (and the runways long ago gave way to farm fields). By giving witness to them, and the other sites on my to-do list, perhaps this will perpetuate their lives until the contributions they represent become the responsibility of the succeeding generation. — Scott Spangler, Editor