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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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Pilot Population & Demographic Stability
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Most pilots know that the test of an airplane’s dynamic stability is to trim for a specific hands-off speed, increase or decrease pitch to a faster or slower speed, then let go of the stick and measure the time it takes to resume the hands-off speed. It’s my contention that seeking its demographic stability is what the U.S population has been doing since 1980, when it peaked at 827,000 active aviators. That also happens to be the year that the last Baby Boomers, born in 1964, became old enough to solo.
Working in round numbers, the first of 76 million Baby Boomers were born in 1946. They were old enough to get a private certificate in 1963. I wasn’t able to find the number of active pilots that year, but it probably wasn’t much more than 1964’s 431,000. Certainly, we Boomers aren’t the sole source of the rapidly increasing population, but as were in other facets of the American demographic landscape, we were the dominant variable.
As we came of age, the pilot population blossomed like flowers in spring. By 1969, when Boomers ranged in age from 23 to 5, there were 720,000 pilots. Over the next decade the population climbed in five-figure steps to its peak in 1980, when they ranged from 36 to 16. The decline that started then is, most likely, the retirement of pilots of the Greatest Generation, born between 1901 and 1924, and the so-called Silent Generation, born between 1925 and 1945.
And now it’s our turn. Until 2005, given a point or two fluctuation, Boomers accounted for more than half of the pilot population. That changed in 2006, when the first Boomers turned 60. After our self-inflicted economic melt-down, the Boomer’s representation fell to 43 percent of all pilots. In 2011, it was 40 percent. With 8,000 of us turning 60 every day, and the uncertain financial world in which we one day hope to retire, I expect this trend will continue with increasing speed.
Where the pilot population will find its demographic stability is anyone’s guess. Looking at the succeeding generations and their financial futures and opportunities, my guess is 300,000 or less.
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Air France 447 and Sleep Deprivation: A Fatal Link
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Every journalist who has writtten in the past few years about the 2009 Air France accident has eventually ended up asking the same question … why did an experienced crew react to the weather the way they did, as well as to the failure of some of the flight instruments aboard the A330 and why did none of them recognize that their airplane was falling from the sky.
Now we might have at least one of the answers; sleep deprivation. The National Sleep Foundation reports sleep deprivation can impair a person’s reaction times and performance even more than alcohol consumption. The more significant the deprivation, the greater the impairment.
The French news magazine Le Point broke a story on Saturday based on a transcript of the Air France 447’s cockpit voice recorder that until now was unknown. Le Point reports Captain Marc DuBois telling his two cockpit crewmembers less than two hours after departure from Rio, “I didn’t sleep enough last night. One hour — it’s not enough.” Another story in Saturday’s Mail Online said the two co-pilots also lacked adequate rest before the Rio to Paris flight began on the evening May 31, 2009. Flight crew rest, especially for pilots traveling across multiple times zones as was the Air France crew, has become the focus of major regulatory actions in both the U.S. and Europe over the past few years. The revelations about the fatigued states of these pilot before they began what would have been a 10-hour flight to Paris are certain to alter how the industry evaluates the amount of rest any flightcrew has had prior to takeoff. (more…)
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Cash for Towers: You Can help
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Still Time to Save Some Towers — Straight off the massive printing presses at the General Aviation Airport Coalition in Washington comes late word that a deal is in the works to pull some cash from one place and send it somewhere else. What’s new about that push is it might just keep some of the busiest control towers in the nation alive and kicking … at least until the end of September. Now get busy and call … no time left for writing.
Rob Mark, Publisher