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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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Building a Positive Aviation Future
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At American airports these days is hard to find a good word from pilots about their aviation future. After covering the 57th Sonex Aircraft Builder’s Workshop at the company’s Oshkosh, Wisconsin, hangars it seems clear I’ve been looking in all the wrong places and talking to the wrong people.
From as far away at Guam, the Netherlands, and the four compass quadrants of America, 21 people attended the workshop, and 14 of them brought guests—wives, sons, brothers, and building buddies—who attend the workshop free of charge and learn metal working by building an abbreviated metal wing section.
Most were first-time builders. Some already had Sonex kits at home, awaiting the courage the new workshop skills would give them to open the boxes. Others were still deciding on the model that best met their needs, and their future flights guided their decision making.
Most remarkable is that not once did I hear a work-shopper complain about anything aviation related. And all of them, except for one who was a student in training, were pilots. The closest one of them came was criticism of his own work; “I can do better,” he said.
Can’t we all.
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Why Drones Really Worry Me as a Pilot
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RSS FeedFirst let’s talk a little reality … Unmanned Aerial Systems (UAS), or drones as most of us refer to them are coming … and they’re coming soon. That’s not necessarily all bad though. Drones can operate in places that are not safe to send a manned aircraft, as well as on missions where the duration would surely exhaust a human. They also come in a range of sizes from just a few pounds to the mammoth Global Hawk weighing in at about 32,000 lbs. or slightly larger than the Hawker 800 biz jet I used to fly.
The FAA’s come under fire from drone manufacturers and potential users for not acting quickly enough to draft regulations allowing these pilot-less aircraft to blend into civilian airspace with the rest of the civilian aircraft. But there’s a safety problem with moving too fast that no one seems to have addressed.
Give this show a listen though and tell us what you think. BTW, for the most up-to-date coverage on drones here in the U.S., give a listen to the UAV Digest produced by my Airplane Geeks comrades Max Flight and David Vanderhoof.
Rob Mark, Publisher – If you’re receiving this Jetwhine post by e-mail, click here to listen … even from a smartphone. You can also subscribe to The Aviation Minute at iTunes.
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Looking Bach at Aviation Eras
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Recovered from his landing mishap in the Pacific Northwest, Richard Bach has resumed his online conversation, and he is as thought provoking as ever. In “Change of an Era” he reflects on the change progress has always brought to aviation, and the choices pilots must make in adapting to it.
Aviation’s first new era occurred during the life of Antoine de Saint-Exupery, Bach wrote, when pilots who wanted to fly every day advanced from “looking at the world outside of their open cockpits” to “flying blind” with the aid of “needle-ball and alcohol.”
This instrument era of aviation lasted for 50 or 60 years, he continues, and then progressed to the digital era. With “flat plate moving maps,” he describes it as “all pretty colors to show one’s position, altitude, restricted areas, terrain, weather, other airplanes in the sky.”
In closing, Bach writes that, “uninterested in modern aircraft, modern moving maps, electric motors to turn propellers,” he realized that “aviation has passed me and my time.” But that is, it seems to me, a personal perspective.