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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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Sometimes Saying No is Just Plane Stupid
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Looking back on the decade of my life I spent working at FAA I remember one thing for certain. When someone at the agency told me “No,” the reasons were seldom clear.
“No,” might have meant something as simple as “No,” because I don’t agree with that idea or even “No,” because the idea came from me. Sometimes “No,” meant my boss didn’t know the answer and he or she didn’t want to ask anyone else. Or sometimes “No,” meant my boss actually did know the answer and it came from pretty high up so just deal with it. Of course I haven’t worked at FAA for 25 years.
As the Sunday deadline to begin controller furloughs passed last, airline passengers, business aviation operaorts and even flight training companies have no idea what’s coming next now that sequestration-induced furloughing of air traffic controllers has begun. Air traffic delays could be ugly now that FAA decided air traffic controllers are no longer essential personnel … nor are safety inspectors or the technicians that keep all the electronic gear the FAA uses up and running.
Think about that new “non-essential” ATC tag for a moment. I recall the Reason Foundation’s Bob Poole and I chatting just a few weeks ago about how ATC was considered an essential government service to people who did not support privitization. Now FAA says these folks are not really that important. The FAA never raised the issue of controllers not being essential until this week, when that move worked in their favor.
Aviation Takes Another Right to the Jaw
When FAA was asked by Airlines for America (A4A), the Air Line Pilots Association (ALPA) and the Regional Airline Association (RAA) to take a deep breath and rethink the furloughs, perhaps the same way the FAA did (OK, they were pressured into it) the issue of contract tower closures, the agency said no, claiming they don’t have that kind of budget flexibility. We all believe that don’t we, especially when the agency somehow managed to find the cash to extend contract tower discussions until mid-June.
Of course the essential question is why aviation? That answer’s actually pretty simple.
About now, DOT Secretary Ray LaHood is probably wondering where is replacement is. Mr. Huerta and his team said no, because our pragmatic DOT Secretary Ray LaHood told them to say no. And of course, Mr. (did my resignation take effect yet?) LaHood takes his marching orders from the White House who has decided that aviation is the one place in the nation where the Democrat’s scolding of Republicans will have the greatest effect. (more…)
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Instructor Academy Gives Beech a Future
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The recent announcement that the American Bonanza Society and its ABS Air Safety Foundation had established the ABS Flight Instructor Academy was not only good news, it was a surprise. For some reason I’d thought that it had been around as long as ABS’s exemplary Bonanza Pilot Proficiency Program, which has been providing type-specific training for 30 years.
Perhaps it was, in an informal sharing of information among the the BPPP instructors. I took the course in 1991, and my instructor was Sandy Provenzano, 1990’s Flight Instructor of the Year, and knowledge of the F33 Bonanza I was flying surprised not only me, her knowledge revealed new insights to the airplane’s long-time owner.
The need for the ABS Instructor Academy has never been greater. Given the business travails of their maker, the Beech Bonanza, Debonair, Baron, and Travel Air are essentially orphans now. When these piston survivors are adopted by new owners, finding a qualified CFI for an in-depth checkout isn’t easy. The ABS Instructor Academy solves this problem and, given the challenges facing general aviation, groups dedicated to the support of other makes and models should take note of this solution and its mission, “to protect lives and preserve the Beechcraft fleet.”
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Dragonfly Vision & Hungry Midair Meetings
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Like many aviators I appreciate anything that flies whether it’s a manmade machine or product of natural selection. Among insect aeronauts the dragonfly is my favorite. Let’s face it, who wouldn’t envy its ability to rapidly fly from point to point (at speeds up to 30 mph!), make directional changes to the left, right, or reverse with the alacrity that would rip the wings off most machines, and then quick-stop into a motionless hover.
What I didn’t know, until I read “Nature’s Drone, Pretty and Deadly” in The New York Times on April 1, is that dragonflies are “brutal aerial predators, and new research suggests they may well be the most brutally effective hunters in the animal kingdom.” Even more amazing, they do it using a skill all pilots should have learned from their instructors early in training. I won’t bore you with the details of the research (my wife has already suffered for you), but the dragonfly’s mastery of this skill enables them to snatch midair meals with a success rate of 95 percent.
Research attributes this amazing kill ratio to the dragonflies brain, eyes, and wings. It has “an almost human capacity for selective attention, able to focus on a single” bug among a cloud of fluttering insects. Other researchers have identified “a kind of master circuit of 16 neurons that connects the dragonfly’s brain to its flight motor center in the thorax.” In other words, this fly-by-wire insect can “track a moving target, calculate a trajectory to intercept that target, and subtly adjust its path as needed.”
Obviously, this is a skill combat pilots must hone to survive. And understanding the key visual concept that contributes greatly to the success of fighter pilots and dragonflies alike will help civilian pilots achieve the opposite outcome—avoiding a midair meeting, which more often than not happens within 5 miles of an airport the participants are flying toward or have just left.