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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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GA Aircraft Owners, Make Your Voices Heard
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For the 34th year, the FAA has reached out to aircraft owners and Part 135 operators to take the pulse of general aviation. What’s sad is that over the years, many of my friends lucky enough to own an airplane rarely took the time to complete the survey because, they whined, responding on paper and snail-mailing it was just too demanding. This year they have no excuse: aircraft owners and operators who received the postcard invitation or survey by mail can respond online. Do it now at www.aviationsurvey.org!
The survey is the only source of information on general aviation activities, from hours flown and the reason for flying to the type of aircraft flown and the flying conditions (day, night, VFR, IFR). The FAA is collecting data for 2011, so, said the FAA, “Owners who did not fly their aircraft in 2011, have sold it, or are awaiting repairs should also respond to the survey.” A N-number access scheme ensures non-owners and operators don’t skew the data. And the FAA emphasized that the “information will be used only for statistical purposes and will not be published or released in any form that would reveal an individual participant.”
Participation in the survey is voluntary, and with the online option removing that last little bit of hassle, why wouldn’t each of you not take a few minutes to help chart general aviation’s future? You see, after collating the data it uses this information to assess funding, infrastructure services, the affect of safety and regulatory changes, and to prepare safety stats and calculate GA accident rates. If we don’t care enough about general aviation to spend a few minutes filling out a survey, why should the FAA care any less than it does for the needs of GA? — Scott
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A Little Labor Day Message
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Thanks to my comrades at The Airplane Geeks Show for staying way ahead of me and posting my annual Labor Day message. In case you don’t listen to our show — impossible as that might be — do give this link a quick click. Promise I don’t pontificate too much about what the labor movement and the aviation industry have lost over the past 10 years or so.
Airplane Geeks Episode 212.5 – Labor Day. Or if you prefer to read, here’s a link to a quick reprise to some other thoughts about why Labor Day should still be important to us here in the states.
Rob
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Aviation’s Singular Moments: What’s Next?
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Reading Neil Armstrong’s obit in the New York Times led to an unexpected epiphany: As the inaugural pioneers, the collective public faces of singular accomplishments achieved during the first century of powered flight pass, what events of equivalent magnitude will follow them in its second century? And will humans have a hands-on role equal to Armstrong’s?
Achieving a singular first during flight’s first century was comparatively easy because no one preceded the successful pioneer. The brothers, Wilbur and Orville Wright, powered their way skyward. Charles Lindbergh flew the Atlantic, solo and unrefueled. Jimmy Doolittle took off, flew a pattern, and landed without a way to look outside. Yuri Gagarin opened the door to space travel and Neil Armstrong walked through it on the moon.
The passage of time lists the pioneers who will be next. Chuck Yeager broke the sound barrier in 1947, Dick Rutan and Jeana Yager circled the globe without refueling the Voyager in 1986, and Bertrand Piccard and Brian Jones repeated the voyage in an aerostat in 1999.