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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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Aviation Fences Past, Present, and Future
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On a two-wheeled vagabondage adventure, I reunited with my riding buddy in Seattle, and he’s leading us east toward Oshkosh. For those unfamiliar, vagabondage has a direction of travel, like east, but no route or itinerary. Except for one must-see stop: the concrete arrow that pointed air mail pilots toward Boise. Yes, we’re aviation geeks.
Almost a century ago, these arrows, situated with a lighted beacon, guided pilots along the nation’s network of airmail routes. Then radio navigation made them obsolete, and they started to disappear. There’s no small measure of irony involved here that we found our way to this surviving arrow with GPS. Heading to Boise, Idaho, in I-84, it’s off the Simco exit, which leads to the apex of Desert Wind and Regina roads.
As most of us already inside already know, aviation’s present has a problem with fences. Signs warning of federal penalties and security requirements, not to mention locked gates that require secret pass codes, exist to keep people out. They typically overwhelm the signs that attempt to lead aviation wannabes, newcomers, and the aerially curious through the security maze to the knowledge and answers they seek. I didn’t, however, expect aviation’s past to present similar circumstances.
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Rethinking Aircraft Accident Stories
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RSS FeedI had an opportunity to visit the normally closed-to-the-public NTSB Training Center near Leesburg Virginia a few weeks ago as a guest of director Paul Schuda assisted by Senior Air Safety Investigator Bill English.
To say my visit was eye opening would be quite an understatement. Schuda’s briefing detailed the thought processes behind the NTSB’s recent decision not to reopen the TWA 800 investigation. There was much more too, including a look see at the TWA 800 fuselage reconstruction.
The entire Friday afternoon event gave me pause to think about how I write about an aircraft accident, with the insight that perhaps too many of us our jumping to indict the pilots when there may be more to the probable cause to consider.
I hope you’ll give this episode a listen.
If you’re receiving this Jetwhine/ Aviation Minute post via e-mail, click here to listen to the program.
Rob Mark, Publisher
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Is Fresh Evidence About MH370 Another Wild Goose Chase?
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RSS FeedFresh evidence has been uncovered in the disappearance of Malaysian flight 370 (MH370) according to The Telegraph of London. To date, there hasn’t been one single shred of physical evidence that proves any of the dozen or so theories about what happened aboard that airplane less than an hour after it departed Kuala Lampur in March. The mystery was never solved, just put on hold.
Then last Friday, a media note surfaced in Australia that said MH370 searchers were again altering the search area for the airplane to another part of the South Indian Ocean based on some undefined new analysis. Yesterday’s Telegraph story again pointed the possible finger of responsibility at the captain of the 777, Zaharie Shah and his flight simulator.
Listen to the latest Aviation Minute to learn more about new evidence in the MH 370 mystery.
Rob Mark, Publisher
If you received this Jetwhine story via e-mail, click here to listen to the program.