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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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Berlin Tempelhof Airport vs. Chicago’s Meigs Field
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Airports come and go these days, but some closings become more personal than others. Living in Chicago, we had our own sad, yes even depressing moments when Mayor Daley hacked Meigs Field to death just to prove who was really in charge. Personally, I’ve always thought he did it just to prove he was tougher than Steve Whitney and his Friends of Meigs group that managed to keep the airport open for awhile despite the mayor’s objections.
Today though it’s another airport in another part of the world that fell, Berlin Tempelhof, the airport that saved the City of Berlin from starvation after World War II when the Russians instituted a land-side blockade to control the region. The allies mounted a valiant effort in practically anything that would fly – DC-3s, DC-4s, DC-6s and more – to bring millions of tons and food and coal to keep the city alive.
And it worked.
While other airports have fallen in the past few decades, Tempelhof was personal to me because I spent some time there years ago.
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When an Aviation Expert is Needed, Mr. Know-It-All Responds
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Hasn’t this just been an awful month or so, I mean what with the roller coaster ride of the economy, thousands of people loosing their jobs, not to mention the stress of trying to figure out who will lead the United States for the next four years. It’s enough to make even a normal person squirrely. Luckily for Jetwhine readers, there is always that voice of reason and authority who is able to jump in on a moment’s notice to save the day.
So without further introduction, here’s my alter-ego, Mr. Know-It-All …
Greetings aviation buffs. Mr. Know-It-All here. At a time when most of you are trying to figure out whether you can still afford to drive that Porsche in your garage – I prefer a Schwinn myself – you’re probably realizing too that it’s time to make your brain work at something a bit less anxiety producing.
So here goes.
Tell us what either of these two aircraft are and you’ll win accolades from your friends here at Jetwhine. You’re winning are sure to help you find that next aviator’s job as well.
And just in case you’re wondering about whether you need any luck to succeed as an aviator, take a look at this guy landing his airplane after the wing folded. Sure scared me, but then my best friend is a flying squirrel. Tell me … was it real or Memorex?
Ta, ta for now!
Technorati tags: Rocky & Bulwinkle, Mr. Know-It-All, aviation trivia, old airplane photos, pilots, Air traffic control, airports, jetwhine.com -
Under Construction: EAA AirVenture Grounds
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After the last plane took off for home in August, EAA announced it was starting work on a 10-year plan to improve its AirVenture grounds on Wittman Regional Airport. The news release spoke about moving the main gate, new thoroughfares, and improved navigation. It doesn’t sound like much –until you see it first hand.
Last week I tagged along as Steve Taylor, head of EAA’s grounds and maintenance, updated Dick Knapinski, the association’s PR engine, on the progress made. We started on the south side, behind Exhibit Hangars D and B. A Caterpillar D6R dozer was pushing gravel around a 286-by-115-foot hole that was 7-feet deep before they started filling it with 2,000 loads of clean gravel, at 22 tons a load.
This is just one of several underground rainwater run-off cells, Steve explained. Part of the required drainage system, the cells replace open retention ponds, depriving bugs of their breeding grounds–and saving space. Pointing to the wires sprouting out of the gravel, Dick said this is where EAAers will find the Fly Market and AeroMart. This move, and the magnitude of the site improvements, became clear when we arrived at where the main gain used to be.