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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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Labor Relations and Strikes
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I heard an interesting interview on NPR last week with Richard Hurd from Cornell University. He said the use of labor strikes across the U.S. has declined by 90 percent since the 1970s.
When Hurd began to focus on the Reagan Era, I expected to hear him mention the PATCO strike as a key moment. But the controller’s strike was never mentioned.
What changed the labor movement forever, he said, was a reinterpretation by Reagan appointees to the National Labor Relations Board of what it meant for employers to bargain in good faith. The Reagan group decided that good faith meant no more than showing up for talks. Reagan’s NLRB decided that employers could replace strikers, however, if the union took to the picket line in frustration over those discussions. (more…)
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Flight Simulator on Google Earth
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If I had to list things I would never have expected to see on Google Earth – the snappy video mapping software service run by the online giant – a flight simulator would probably be pretty high on the list.
As you’ll read about at Bobbie Sullivan’s Professional Pilot News blog, the simulator is hidden within the Google software and was not meant to be sold as a flight simulator itself. The designers call this kind of treasure an Easter Egg.
How in the world Bobbie Sullivan found this link to the fellow in South Africa is beyond me. Bobbie writes a bunch of blogs – all herself – so she must have been tipped off by elves.
You have to try this. MS FSX it’s not, but it is fun.
Technorati tags: Professional Pilot News, Google Earth, blogging, Bobbie Sullivan, pilots, MS Flight Simulator
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Airline Pilots and the Rest of Us
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An airline pilot career has a few more thorns sticking out of it these days. Pay scales are down, duty days are longer, schedules stink and passengers are easily riled. But even with all that said, I still think it makes for a pretty incredible career.
The airline pilot profession has evolved since 9/11 with a few twists I still don’t understand though. Perhaps you do.
Most airline pilots began their careers learning to fly in much smaller general aviation airplanes and sometimes business jets as charter and corporate pilots before they made it to American, or Continental or AirTran.
So to me, it would seem proper to give little airplanes – sorry, anything smaller than a 737 is little to most airline folks – their due.
Yesterday’s Washington Post ran a Letter to the Editor by former ALPA president Duane Woerth in which he made it clear that some ALPA pilots support the airline’s and the FAA’s perspective that business aviation airplanes are the root of the airline’s problems.
“The most critical issues in the public debate on airline and airport delays are first, that most of these delays that frustrate consumers are airspace delays and not airport delays or even airline-caused delays,” Woerth said. “And second, the huge contribution to airspace congestion of corporate aircraft. Why is the effect of corporate aircraft on congestion so often disregarded?” Woerth also wonders.
In a way, this perspective from an airline pilot really isn’t a great shock to me. After all, their companies do own these people.