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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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Thoughts on United Airlines Latest PR Mess
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Thoughts on United Airlines Latest PR Mess
Seems that United Airlines, our home town airline here in Chicago, has managed again to create another PR mess for itself. When I was still teaching media and communications at NU, I could only hope for situations like this to relate to my grad students about how companies should not treat customers. And yet, here it is once more.
What is this magnetism United seems to have for being able to take an already ugly customer service mess and turn it into chaos? Sure an airline has the right to bump people, but it was the methods United used to bump passengers that got them in hot water the other day, not just their policies.
I was invited on Tuesday to chat with our local NPR host Tony Sarabia about this mess, so give it a listen and tell me what United should have done, because after all, this is just my two cents.
Click here for WBEZ’s Morning Shift for Tuesday April 11,2017.
Rob Mark, Publisher
@wbez, @unitedairlines, @jetwhine
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The Reality of General Aviation Nostalgia
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Basking in the warm breezes of Wisconsin’s first coat-free day of spring, I suffered a pang of aviation desire. It would be a nice day for any general aviation pilot to go flying. But in the hemisphere that surrounds my deck the only sights and sounds of flight were the robins feasting on sunbathing worms. This brought to mind all of the empty airports I visited last year on my Route 66 adventure, and for the first time I made a connection between them and the empty, boarded-up building on the Main Streets of their respective home towns. Like many, I have nostalgic memories for both, but one cannot exist without the other, and the revitalization of either seems slim these days.
Looking forward, I wonder for how much longer these forlorn airports will survive? If the small town doesn’t have the population and jobs to support Main Street businesses, there will not be any aviation-minded individuals around to support the hometown airport. Time will come when the town’s revenues will fall short of funding the services that the entire population expects, and the airport will cease to be a line item.
Other airports survive only because they are supported by Essential Airport Services funding, but the budget proposals floating about reallocate these funds to more politically advantageous recipients. Add the uncertain future of the contract tower program, and working with rough round numbers, it is not implausible that 20 percent or more of the nation’s public use airports will go the way of Meigs Field. Some may suggest that they will survive as destinations for business aviation, but if there are no businesses on and around Main Street, why would business need to fly in there in the first place?
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Aeronautical Decision Making and ‘Being Wrong’
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Aeronautical decision making is a key ingredient in aviation safety, but I’ve just finished an excellent book that has revealed a side to this important topic that’s little discussed. Being Wrong: Adventures in the Margin of Error by Kathryn Schulz takes an in-depth look at why humans find being right so gratifying, and how maddening it is to realize we’re wrong, and wrong so often.
This is not a book for pilots, and the author doesn’t offer any aeronautical examples. But as an aviator, on almost every page I could relate the her examples to aviation, pilots, and the decisions she makes. Perhaps the most important advice she gives, which applies to all human endeavor, is this: “Regardless of age, we are more alert to the errors of others than our own” and “pointing out the errors of others give those people little reason to change their minds and consider sharing our beliefs.”
She starts by exploring human factors and error studies and makes the point that not all errors are the same. Being wrong on where we left our car keys, she says in one example, is not the same as being wrong on the existence of weapons of mass destruction. She then goes on to show that “error is the borderland between vigorous mental life and dementia,” that error is vital to the process of creation and invention, and that error is often the start of adventure (good and bad). (more…)