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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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Knives on the Plane
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New Yorkers often stand as a national litmus test of just how tough Americans can be in a crisis. The weeks and months after 9/11 showed us that even they have their limits although most found a place somewhere to bury those ugly days.
In just a few seconds Monday, however, thousands were brought face-to-face with the reality of another large jet again circling Manhattan when the Air Force flew a 747 down low near the island. With an F16 in tow, you couldn’t blame anyone whose brain was instantly transported back September 11th.
Apparently all sorts of government agencies knew about the flight. They all just somehow forgot to share that information with the rest of us. The Air Force and the White House seem to have taken the brunt of the finger pointing.
Lost in the conversation however, was any mention of where the Department of Homeland Security’s multi-billion dollar Transportation Security Administration was during the planning of the flight. What were they thinking? Or perhaps more importantly, were they thinking about the millions of citizens around New York at all. It’s TSA’s job to make us safe, right. At the magic 100 day point in the new administration, the TSA is still without an administrator, just like the FAA.
Lord knows that as a business aviation user and advocate, the Transportation Security Administration (TSA) is not high on my list of folks to be cooped up with for very long. The agency’s most recent attacks on our industry, the Large Aircraft Security Proposal (LASP), for instance, would demand that all forms of aviation security look like that of the airlines even though the two business models are completely different. At least one senior official in Senator Durbin’s office told me he thinks the 7000 + comments received about LASP probably stunned the leaderless TSA, at least for the time being. But there is much more to aviation security than beating up on business aviation, at least I hope so.
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Fox Valley Tech Pairs Pancakes & Future
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Fly-in pancake breakfasts have been a grassroots aviation staple for nigh on a half century or more. Most of them are hosted by EAA chapters or local flying clubs, which is why the feast hosted by the Fox Valley Technical College at its aviation campus on the Wittman Regional Airport caught my eye, tickled my curiosity, and posed a question: Why?
Naturally, it was raining. Hard. But that didn’t deter the faithful from diving in. The traffic was steady from 0700 to 1200. Arriving first were the old guys who reminisce about flying days past over coffee and a $6 plate heaped high with griddle cakes, eggs, and sausage. Families started arriving around 0900, and the younger kids gravitated to the FVTC squishy planes piled on a table in the cafeteria of the S.J. Spanbauer Center.
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OSH Tower Falls With Aviation’s Change
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Across the aviation arc on the Internet many have bemoaned the April 9 passing of the old control tower at the Wittman Regional Airport, better known to the world by its location–Oshkosh. Photographers from the organization that calls OSH home–and made it famous worldwide with its annual summer fly-in convention, AirVenture–the Experimental Aircraft Association recorded the event in a photo gallery and video.
Like millions of others, I have a special memory of the the squat, angular cream brick edifice with its blue enameled medallions and a crystalline crown. Since we first met in 1978, it’s always provided some much needed shade and sense of place. Many mourn its passing, but I see it as a cautionary parable for the dawning of aviation’s next century.
The old tower was replaced for a number of reasons, but chief among them was a performance shortcoming, the ability to see all corners of Wittman Field. The much taller and svelte replacement meets this requirement, among others. With the old tower so goes the National Airspace System we all grew up with. Born into uncontrolled airspace we flew into the future of evolutionary growth and change, from pilotage and dead reckoning to ADFs, VORs, ILSs, DME, and RNAV. Our general aviation icons had clearly defined missions and names, like the Stick and Rudder mastery of Wolfgang Langewiesche and the GA pilot’s IFR proficiency of Richard Collins. (more…)