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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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Air Traffic Control & California Bob
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Was it Karma that Bob Richards called me yesterday right after I happen to catch a rerun of John Cusack’s excellent portrayal of an air traffic controller in “Pushing Tin?” Maybe. He called to see if I’d read his new book, which I had to admit I had not.
I’d run into Bob at AirVenture a few weeks ago in Oshkosh where we were both trying to peddle our new books. In just half an hour I remembered something I’d forgotten in the 20 or so years since I’d last seen him.
Bob Richards really likes to talk. And, I probably forgot to mention, his book Secrets from the Tower, was flying off the shelves. I was hoping not to compare his books sales to mine.
I met Bob years ago in Chicago. He was an air traffic controller trainee at Chicago’s Palwaukee Airport having recently escaped from Fullerton Control Tower near LA in search of life.
Everyone thought he looked and acted like a surfer dude so the California Bob name wasn’t much of a stretch.
He stayed with FAA and eventually did what controllers at most of the towers around Chicago and other parts of the nation do at some point in their career … make the decision to see if they can pass muster at the World’s Busiest at Chicago O’Hare.
Bob tried … and succeeded. In fact, California Bob spent 22 years at ORD. Most of us have probably talked to him though we never knew it. (more…)
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Time to Shelve the Shuttle
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America’s first reusable spacecraft is almost 30 years old and it is time to put these tired old machines where they belong … in a museum.
Despite my love of that bright golden plume of fire behind every orbiter at takeoff, and a thundering rumble that shakes the Earth for 10 miles around the Kennedy Space Center, Endeavor’s current problems make it clear the risks of flying these magnificent old machine are simply not worth the risks.
To me, NASA’s decision making is beginning to look too similar to FAA’s.
Right now, NASA is trying to decide whether or not to repair a gash in the external heat shield designed to protect Endeavor when it reenters the atmosphere. The shield was damaged a few days ago by a piece of ice falling off the booster just after liftoff.
NASA allowed the Columbia to begin its return trip to Earth in February 2003 with a similar heatshield affliction and that space craft and crew were lost when the shuttle disintegrated upon reentry.
In January 1986, the shuttle Challenger was also lost on takeoff killing all aboard after a main booster “O” ring disintegrated at liftoff causing that external fuel tank to explode. (more…)
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Cell Phones on Airliners … One Man’s Plan to Fight Back
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Now that American Airlines announced they’ll be testing an on-board Wi-Fi Internet service with AirCell beginning next year, can on-board cell phone usage be far behind? Imagine the fun as we all get to listen in on one more person who thinks they need to yell into their cell phone to be heard.
But for once, I’m not going to wait until airline travel becomes even more excruciating than it already is.
I’m taking matters into my own hands with a promise – no make that a guarantee – that anyone who flies next to me on an airliner should know about before they even think of calling the office to talk about some damn deal or ring their girlfriend about how way cool the concert was. (more…)