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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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Whose Side Was Past ALPA President Duane Woerth On?
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Some of you might recall a post from a few months back in which I expressed disdain that former ALPA president Duane Woerth had in a Letter to the Editor of the Washington Post, signed on to the same old tired airline/FAA line about what’s wrong with the ATC system … it’s general and business aviation’s fault for not paying their fair share.
I thought this former AFL-CIO vice president and former ALPA president was wrong then and I still do. Union folks have no business pitting one side of an industry against another. That hurts everyone. I know it happens, but it’s still wrong.
Then there was yesterday’s Post editorial that took the same line as Duane Woerth (And for the record … business aviation is willing to pay it’s fair share if someone will help us figure out precisely what that is. Hint: We don’t trust the airlines and FAA to give anyone the best numbers on this).
Now I don’t know Duane Woerth … never met the man. But I do know what I’ve learned about his reputation and it’s one that might well make people wary when he comes knocking in his new role as an aviation consultant simply because it’s tough to know which side he’s on. And then there was the letter I received from a Jetwhine reader that got me all stirred up again.
But before I show you the note, a bit of background. It was on Woerth’s watch at ALPA that the RJ Defense Coalition evolved.
That’s a sort of anti-ALPA national group of Comair and ASA pilots – good union folks – that tried to sue ALPA on numerous occasions for giving Delta Airlines pilots bargaining priority over those regional partners. Essentially, ALPA looked to be speaking out of both sides of its mouth trying to fairly represent both groups with the Delta mainline pilots coming out of the fight with far fewer bruises.
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Union Picket Line Outsourcing; Are Pilots Next?
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There’s an interesting union story floating around that seemed worth sharing although it honestly made the hair on the back of my neck stand up. Maybe some of you can add something to it.
A story made the wires last night about a carpenter’s union picket line strung around a job site near Washington DC.
What made the story important was not the picket line itself, but the makeup of the picketers.
Most were not union carpenters.
Almost all were people down on their luck – OK, homeless – who needed the work. For eight bucks an hour, the union hired theses folks to yell and scream while they marched the job site with picket signs. The picketers looked about the way you might expect someone to look who had been living on the street too. Not exactly the folks any union might want in front of the TV cameras on the 6 PM news.
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Southwest Airlines Boarding; A Blast from the Past
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Southwest Airlines has again proven that running an airline – at least from a customer’s perspective – doesn’t need to simply fluctuate between chaos and more chaos.
On the way back from the Blog World Expo conference in Las Vegas last week, I had a chance to try out the airline’s new passenger boarding system. I’d give it 9 out of a possible 10 points.
In the recent past, the trick was to check in early online to be selected for the “A” team – the first 50 seats.
Problem was you’d still need to line up early at the airport gate since seating in the “A,” “B,” or “C” group was first come first serve. If you checked in late online and showed up within 15 minutes of boarding time, a “B” passenger could easily wind up in a middle seat.
Unfortunately, the Southwest system airline used until last week also meant either standing in line at the gate for half and hour, or sitting on the floor, something that turned my wife off to the carrier from day one. (more…)