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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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Seeing Where Bird Strikes are a Threat
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Bird strikes are perhaps the greatest unappreciated risk pilots face. There are a number of reasons for this, but among the primary contenders is the fact that most strikes result in expensive airframe and powerplant repairs rather than catastrophic conclusions. There was some attention paid to this important topic after some geese put US Airways Flight 1549 down in the Hudson River, but with no loss of life, that attention quickly faded.
The the threat remains, and it’s growing larger. A joint report from the FAA and US Department of Agriculture’s Wildlife Services, Wildlife Strikes to Civil Aircraft in the United States 1990-2013, notes that the number of reported strikes has increased more than six-fold, from 1,851 in 1990 to a record 11,315 in 2013. Birds accounted for 97 percent of them. The number of US airports where strikes occurred also increased over the same period, from 331 to 649.
Look at almost any airport listed in the Airport/Facility Directory, and its remarks will probably note: “Birds on and invof arpt.” No pilot would accept a weather report this vague, so why do they accept it for wildlife? And why is a pilot’s education lacking in wildlife knowledge? Do you know when and at what altitude most bird strikes occur?
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Droning on About UAS
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Dear Reader / Listeners – You now have the option to listen to The Aviation Minute podcast or read the text below. If you receive Jetwhine via e-mail, you can click here to listen as well.
At the risk of droning on about a topic my pals David and Max at the UAV Digest show are getting tired of hearing, I just think it’s time to come clean. I really do think drones, UASs, or RPVs or whatever you want to call them, are really pretty incredible technology. And like David and Max, I think their future is set in stone … even here in the United States.
There is just one teensy little piece of the conversation that drone builders and operators seem to be avoiding in the constant push to let the drones fly. How do we safely separate remotely-operated drones from people-carrying airplanes?
We expect a new rule on commercial drones from the FAA by year’s end. But my guess is that will only cover the barest minimums like operations below 400 feet and within line of sight of the operator. Those kinds of model-airplane like guidelines might work too if drones keep well clear of airports.
But what about the rest of the million or so drones sold around the world in the past few years, the ones that seem to be flying closer and closer to airplanes and airports? (more…)
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Changing Aviation Interest & Participation
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This past week the mailman delivered a reason to think about my unknown but rapidly approaching expiration date. Thanking me for my four decade membership tenure, EAA offered me a three-figure rebate if I bought a four-figure lifetime membership.
The numbers didn’t work out to my benefit. Weeks away from the conclusion of the first year of my seventh decade of repetitive breathing, I’ll count myself lucky if I’m still breathing 20 years from now. If that happens, family history suggests that something other than aviation will probably capture my daily interest.
And I’m okay with that. Thinking about it further, my aviation interest, which began in 1958 when I was 5, motivated me to participate, which I started in 1976 by earning my private ticket. Since then my participation, subject to more pressing priorities, has been less than continuous, but I’m thankful for every hour in my logbook.
As much as I’d like to add more entries in that log, to have at least one more adventure that involves a stick and rudder, I accept that this possibility diminishes with each day I breathe. And I’m okay with that, too. Preparing for my final days has taken precedence, but my interest in aviation, as it has since I was 5, will sustain me.
Of greater concern is the interest and participation of the generations that follow, and how aviation as an industry will adapt to their demographic nuances. If EAA’s rebate offer is any example, it will not fare well because the baby boomers in charge are making generation-centric decisions that are disconnected from the generations that are succeeding us.