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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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Brazilian ATC Hangs Up on Pope
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This story would actually be funny if it weren’t such a sad reminder of miserable state of air traffic control in Brazil.
When Pope Benedict left Brazil on Sunday aboard an Alitalia flight, he wanted to send one final good will message to his followers. Passing through Recife Center, the pilots thought the best way to send the Pope’s greetings would be through ATC.
For some 28 minutes, the Alitalia crews calls to Brazilian ATC went unanswered according to a local radio enthusiast who listened in on the broadcast.
Worst of all, the crew never did make direct contact with ATC. The message ended was eventually relayed back through a TAM aircraft that was able to hear the airliner.
Imagine what might have happened if the Pope’s aircraft had been in distress.
Technorati tags: Pope+Benedict, brazil+air+traffic+control, pilots, ATC
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Joe Sharkey: Quite a Different Perspective on the Brazilian Midair
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Being a passenger on board an airplane that barely escapes becoming a pile of twisted metal and flesh would probably be enough to drive most men’s passions for air safety, at least that’s what I’d say about Joe Sharkey.
Sharkey, the writer who happened to be sitting in cabin of the Legacy when it collided with a Boeing 737 over the rainforest last fall, has thankfully continued to pummel the Brazilian government over the insane conduct of the crash investigation.
He told everyone on his blog a few months back that he was frustrated enough with the proceedings in Brazil, that it was time he moved on to write about something new. But I knew he’d be back.
This week he provided a couple of important resources to helping we armchair investigators try and figure out what happened.
A Jetwhine reader told me yesterday that I had my facts wrong in a piece I wrote about the collision and the most likely cause of the crash was that the Legacy crew never turned on their transponder before takeoff rendering the TCAS system inoperative.
That comment simply doesn’t jive with what I read in the report the Legacy’s operator, ExcelAir put together to refute some of the charges tossed on them and their pilots by the Brazilian government.
But perhaps I missed something so please take a look and decide for yourself. (more…)
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Brazilian Midair: Were U.S. Pilots to Blame?
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You just have to love the Brazilian government.
After eight months of pilot and air traffic controller interviews, the Federal Police there seem to have decided the only logical reason for last fall’s midair collision over the rainforest was that the two U.S. Legacy pilots failed to notice their transponder went inoperative. The broken transponder also rendered their Traffic Collision and Avoidance (TCAS) system useless.
No need to consider why the transponder on the aircraft failed, nor any need to note that Brazilian air traffic controllers never noticed the lack of a transponder signal for the last hour before the crash. At least there is no need to admit that publicly.
No need to fuss about the fact that neither sector of Brazilian ATC really understood that both aircraft were at the same altitude. No question about why the Boeing crew didn’t see the Legacy before the accident.
And why would anyone flying an airplane under any flag care that the two airplanes reached the same point in time and space on two completely different radio frequencies.
Nope. Joe and Jan were flying and it happened on their watch. (more…)