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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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Another Pilot Shortage — Really?
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Boeing released its periodic Pilot & Technician Outlook at Farnborough on July 11. In hours the global media started producing stories of future doom because of the shortage and said that the new pilots trained over the next 20 years would be less qualified.
Are you serious? Really? You’re telling me that America’s starving flight training industry could not properly educate 23,025 pilots a year—a number that would meet the annual worldwide quota—to ATP standards? And of that number, North America needs only 3,450 new professional pilots a year. I searched the report and couldn’t find how many went to Canada and how many would fly in the United States.
Why is that no one seems to look past the big number: Boeing forecasts a global need for 460,500 pilots over the next 20 years. Apply some middle school math and you get the annual needs 23,025 and 3,450. What should be more disconcerting is that North America’s need for 69,000 more pilots is only 15 percent of the global total and roughly a third of Asia’s need for aviators.
Here’s an idea: Rather than our collective wringing of hands over a shortage that doesn’t exist, let’s figure out how we can incorporate language instructors into flight training faculties so schools can meet the needs of those who need the most pilots, and so pilots who don’t speak those Asian languages might have a shot at a job. — Scott
Technorati Tags: Boeing Pilot Forecast,Pilot Shortage -
Bird Strike Investigators Want Your Snarge
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Bird strikes have been one of my passing interests ever since I watched the head-on confrontation between a seagull and A landing A-6 during a wheels’ watch at NAS Alameda in the early 1970s. (The seagull lost, by the way.) Somewhere over the years the experts who study and do their best to prevent bird strikes started using that unusual word in the headline.
“Snarge” is the term given the visceral remains of a bird strike and, it seems to be specific to aviation. According to World Wide Words, a 2003 article in Flying Safety attributed its creation to the Smithsonian Feather Identification Lab, which does all the CSI work, including DNA identification, to identify species involved in the strike. The lab said it got “snarge” from the experts who prepared the bird specimens.
Identifying the species involved is the first step in preventing the problem, says a new and really informative video from the US Department of Agriculture, Strike, Snarge, and Safety: Your Guide to Wildlife Strike Reporting. The USDA’s Wildlife Service maintains the bird strike database for the FAA. Without knowing the species involved, the experts cannot modify habitats and employ other means of dispersal.
The video dedicates much of its 12 minutes to the step-by-step collection of remains (pluck, don’t cut feathers, the down matters) and snarge (use alcohol and clean cloths and swabs, not cleaning sprays, which do bad things to DNA) and how to send it the Smithsonian bird strike investigators (BSI) at the feather lab. It even itemizes a collection kit from gloves to swabs to resealable plastic bags, and recommends creating it before it’s needed.
Uniting the various video components is the need to report every bird strike no matter where it happens, because they occur at airports large and small and with a control tower and without. Regulations require military pilots to report every strike, civilian requirements stop at “pretty please!” In an average year, bird strikes cost aviation $1 billion, so every aviator should watch the birdy, and submit the snarge and other remains when one plays chicken with an airplane and loses. — Scott
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Flying the Airbus A380
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Every so often work becomes fun. OK, admittedly, not very often. When the folks at Aviation International News asked me to check out the new Brake-to-Vacate system Airbus had designed, they mentioned I’d have a chance to see it in action since the technology was installed on a new Airbus model … an A380. Did I want to go fly it?
Fly the A380? Hmmmm. I had to think about it of course … for oh, maybe a quarter of a second. Next thing I knew, I was in Toulouse checking out the technology and driving the bus. And for the true airplane geeks, the Airbus A380 brake-to-vacate system allows the flying pilot to determine before landing precisely which taxiway turnoff the aircraft will be able to make using maximum reverse thrust and the most efficient use of wheel braking.
Ryan Dietz and I mixed the videos I shot with some B-roll footage the Airbus folks were nice enough to share and the end result is what you see here.
With AirVenture 2012 just around the corner, it seemed like just the right time to talk about the fun of flying airplanes. Hope you enjoy watching this as much as I did flying the biggest bus. BTW, how was my landing?
Now … I have to get back to work.
Rob Mark
(Click the photo or YouTube icon)