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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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Controllers Work Less Air Traffic Now Than in 2000
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Before you all begin sending shipping the uglygrams, let me tell you that neither the title of today’s editorial, nor the concept behind it originated with me.
The idea that air traffic controllers are working less traffic these days – as well as few more interesting tidbits – originated with the man in charge of the agency, acting administrator Bobby Sturgell.
In front of a crowd of 300 to 400 people at this year’s AirVenture a few weeks ago, Sturgell took questions from the audience during the “Ask the Administrator” session.
I had never heard Sturgell in person, but have listened to a ton of people tell me about what a good guy Sturgell is.
As a man, Bobby may well be a great guy, the kind you’d want to have a beer with. And I can tell you that anyone who can ka-thunk a fighter plane down on a moving aircraft carrier at night in bad weather has my respect … as an aviator. But in my experience, pilots make lousy leaders. And as an administrator, Sturgell’s hasn’t altered my opinion on this.
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Gemini Diesel Engine Attracts Industry’s Eye
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At first glance the Gemini 100 looks like a compact water-cooled aircraft engine with four opposing cylinders. Narrow and not very tall or deep, it’s roughly the same size as a Continental O-200 and has the same output, 100 hp. That’s where the similarities end, says Tim Archer, president and CEO of Powerplant Developments, the Gemini’s manufacturer. With three cylinders and six pistons, the Gemini burns diesel/Jet A.
Come again?
Like a lot of pilots, I’m not much of a gearhead, but this caught my attention. The Gemini is an opposed piston engine, meaning the combustion chamber is formed between two pistons in the same cylinder, Archer explained. The intake and exhaust ports are orifices in the cylinder wall and the piston’s movement opens and closes them.
Parallel crankshafts transfer the power to the reduction gearing built into the front of the case. Being shorter, these cranks are not subject to the torsional loads imposed on the longer cranks in traditional engines. To ensure reliability, the Gemini cranks are made of EN40 steel, the same steel often used to make cranks for Formula 1 engines, which routinely run at 19,000 rpm, Archer said.
Apparently I’m not the only one attracted to this innovative powerplant. Powerplant Developments has signed a memorandum to supply a pre-certification Gemini 100 and two turbocharged Gemini 125 engines to an Italian aircraft manufacturer, Tecnam. And during EAA AirVenture, seven other airframers expressed interest in the engine, especially the forthcoming 180/200 hp and 300 hp versions. The company has completed design studies for Gemini engines up to 600 hp.
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Fun Flyer Lands Role in new Amelia Earhart Film
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If time is short, never ask Dick and Sharon Starks what they’ve been up to lately. Both pilots, these retired schoolteachers have a full flying life that any pilot would envy. Anxious to see Sharon’s new airplane, a Morane Model L parasol, I learned it played a supporting role in a new movie about Amelia Earhart, now filming in Ontario, Canada.
Amelia focuses on Earhart’s life before she got lost going around the world. It stars Hilary Swank, with Richard Gere as her promoter-husband, George Putnam, and Ewan McGregor as Gene Vidal who, say the movie sites, was her true romantic interest.
That’s news to me. What I want to know is how the Starks and their replica World War I French airplane ended up in Canada, which stands in for Atchison, Kansas, which is just across the river from the Starks’ home just north of Kansas City.