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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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The Southwest Effect in Ireland?
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For as long as I can remember, Southwest Airlines, now the largest U.S. domestic airline, created in the 1970s by Herb Kelleher and Rollin King, has been the low-cost airline others most want to emulate. The need to copy isn’t just about money, although Southwest has a profit history better than any other airline in the world. Most Southwest look-a-likes have, in fact, been dismal failures.
Southwest has a record of solid labor relations – despite last week’s pilot contract rejection – and a culture of customer fun in an industry that most others have never been able to duplicate. Southwest simply delivers a solid, consistent service at a fair price that keeps passengers coming back. To me, an airline that actually still responds in writing to a customer complaint says quite a bit.
The airline’s no hidden fees policy has also carried it quite a long way at a time when competitors have tried charging for everything short of breathing space. True, Southwest did appear to break with tradition last week when it announced some new fees, but charging for the work related to managing unaccompanied minors as well as pets carried in the cabin is something the average man or woman on the street will most likely never notice.
On to Ireland
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Old Fashioned Focus Sustains Sonex
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No one in aviation has escaped the recession, but it seems that some companies are better set up to deal with it because they pursue an old fashioned business model: listen to your customers, do everything in your power to meet their needs, and grow the business only when it makes sense, not to meet the annual demands set by shareholders interested only in a short-sighted return on their investments.
Sonex Aircraft is one such company with an old fashioned focus. “Business is down, like it is for everyone in this economy,” said Mark Schaible, at the company’s four-hangar complex at Wittman Regional Airport in Oshkosh, “but the demand is still there, and our business model is serving us well.” The company is busy delivering products and developing new ones, like an electric airplane, for the future.
Flexibility is a business model key that works in good times and bad. As just one example, Sonex’s eight employees don’t have titles: they are responsible for things. For Schaible its PR, marketing, and inventory, “and everyone picks up a broom when needed.”
Outside vendors make most of the parts for the Sonex line of amateur-built aircraft, and the same is true for the sibling business, Aero Conversions, which makes the AeroVee engine used by an ever growing number of homebuilts. Using the VW conversion as an example, Schaible said there’s always more than one quality provider, so the company is rarely in the lurch, and Sonex does all the engineering, so a single source cannot cause problems like those Boeing has faced with its 787 Dreamliner.
Flexibility’s equal partner is deliberate, managed growth, Schaible said. With flexibility, to sustain the business, “you don’t need to grow.” “We work on a real slim margin,” because serving customers more efficiently and economically is often better than nonsensical growth, especially for a business that staked its niche by providing more airplane for less money.
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A380: Quite a Ride
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I was privileged to have been invited to fly the Airbus A380 in Toulouse last week. I think it took about 4 seconds for me to decide when I was asked if I wanted the job of flying, evaluating and then writing up my findings on a few new pieces of on-board electronics to this big bird. The assignment came with the chance to spend an hour or so at the tiller and the side stick of the 380. The major results of my evaluation will be found in an upcoming story on the aircraft in Aviation International News.
The day after returning from France, I headed out to our local airport restaurant to wow some of my Saturday morning airport pals with tales from the large side of the industry. At maximum gross weight, the A380 weighs in at just over 1.2 million pounds. I think my first Cessna Citation tipped the scales at around 13,000 pounds.
The day I returned from France too, my friend Addison Schonland from Innovation Analysis Group (IAG) called to ask whether I had any fun on the flight. Within a few minutes of listening to me bubble over with enthusiasm for the event, he decided we needed to record a podcast for his show. We did.
So sit back and listen in as two airplane geeks – sorry Court and Max, we’re just borrowing the title for a minute – talk a bit about the ins and outs of flying the largest commercial aircraft in the world. It was a gas. My thanks to the folks at Airbus in Toulouse for offering up the opportunity. Wonder if it’s time to turn in that RJ photo at the top of the Jetwhine logo for an A380? Mmmm.
Flying the A380 (click to listen). Rob Mark
Technorati tags: Airbus A380, airline pilots, air travel, IAG, Addison Schonland, Aviation International News, Toulouse, Flying the A380, Cessna Citation