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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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Mr. Babbitt Needs to Get in Shape
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Some functions come naturally to most humans, eating, sleeping, even defending ourselves … at least most of the time. But the message the House of Representatives just sent FAA Administrator Randy Babbitt with passage of the European Emissions Trading Scheme Prohibition Act of 2011 is pretty clear. Our administrator needs to find a sparing partner and get himself in shape for the scuffles ahead with Europe.
For years, the European Union has promoted its plan to reduce aviation’s carbon footprint anywhere in the group’s 21-nation states, despite the fact that research shows this industry contributes far less to global warming than just about any other segment such as automobiles — between two and three percent by most calculations.
No matter. It’s their union and they are free to make their own choices. Problem is that this new EU plan will significantly affect our industry here in the states because the EU intends to hold every country responsible for complying with their carbon trading scheme if they fly into EU airspace.
Most other countries are having a little heartburn with the plan, as is ICAO, the United Nations body focused on aviation that believes one country or one region setting it’s own standards – higher or lower than the rest of the world – is a rally bad idea, and one that will be enormously difficult to enforce. (more…)
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Simulated Intro Cuts First-Flight Stress, Cost
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At the August meeting about the AOPA Student Retention Initiative, a CFI in the audience suggested replacing a real airplane, the most expensive line of the flight training bill, with a simulator. Not totally, mind you, but enough to get students started, and to ease the natural anxiety arising with the noisy, demanding, distracting environment of the real thing.
The Aviation Training & Resource Center, I recently learned, is trying just such a program. Called Wannabee a Pilot, for $599 students get 5 hours with a CFI in a Redbird FMX1000 full-motion visual sim, complete with ground school and pre- and post-flight briefings. The time counts toward a private ticket, and given the 21st century proclivity for virtual experiences, this may be the perfect introduction to flying the real thing.
Let’s face it, to people who lived in a carefully controlled world where risk is managed at every turn, the cockpit of a single-engine general aviation trainer is a scary place. It’s loud. Glass or steam gauges gush with relentless and incomprehensible flow of information. You steer with your feet. And everybody is talking to you at the same time. The tower talks faster than you can listen. And the person sitting next to you is explaining everything in a foreign language. Oh, and you’re paying a lot of money to be here.
Honestly, my initial reaction to the simulator suggestion and, later, the Wannabee a Pilot program, was not positive because I compared them to my old-school life experiences. Fortunately, among the voices that mount my mental soapbox is a contrarian who objectively dissects initial reactions before they dribble from my mouth or fingertips. By putting me in the previous paragraph, it became immediately clear that a simulator is the perfect place to start the training of today’s pilots.
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AF 447: Final Moments, a Few Thoughts
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I have always felt I’d be doing my flight students a disservice not to mention that while soaring aloft is an unmatched experience, it can and will snuff out a life in a moment if the pilot becomes too complacent … no matter how sophisticated the aircraft’s on-board equipment.
We’ve been reminded of the seriousness of that warning again as the investigation into the crash of Air France 447 continues. A CNN story Friday highlighted some of the elements again, but also walked listeners through a few of the final words of the pilots in the cockpit two years ago, moments before the aircraft hit the water after a 4 1/2 fall from 36,000 ft. The words were part of a new book written by French journalist Jean-Pierre Otelli that includes yet unheard portions of the crew’s cockpit conversations. Granted, Otelli is known as a bit of an ambulance chaser, but the words we hear are what’s important, not necessarily his motivation is recording them.
Having read the other transcripts, this one too seems to confirm that the crew was indeed overwhelmed by the cacophony of lights and aural alerts they must have been confronted with a very short time span. I was saddened just to listen, but also well aware that this could have been any of us in this situation and also, that there is much yet to learn from this watershed accident. (more…)