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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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Business & General Aviation: Letters Can’t do it all
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Even for me, this whole business aviation as the bad guy thing is becoming pretty tiresome. How much longer can most of our industry sit back and take it before we evaporate?
In last week’s USA Today article about Aviation Trust Fund dollars being rudely sucked away from big airports to keep podunk runways usable, the Air Transport Association again portrayed itself as the White Knight, the vanguard of a movement for truth justice and the American way, all focused on their altruistic need to save the taxpayer from the skullduggery of those non-airline airplane operators … that would be us of course. NBC aired a companion piece. Heck, almost like the stories were well … you know, coordinated or something. Where could they have come up with that idea?
Oh Paaaleeeze!
The response was predicable with Jim Coyne of NATA writing a Letter to the Editor castigating them for a “poorly researched … misleading” story that of course completely ignored how many of those airplanes at smaller airports that often receive grant money from the fund, helps keep those pesky little business and general aviation airplanes away from the big airports.
NBAA President Ed Bolen wrote one too. It said the USA Today piece was “one sided … lacking in balance … a gross misrepresentation of the value of general aviation public use airports …” Both leaders are right of course. Obviously too, ATA never read the piece of research from Oxford Economics and released by the U.S. Travel Association that points to the value of business aviation.
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A Complex (Airplane) Question
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After reading last week’s post, NPRM Points to Flight Training’s Future, Jason Blair, the executive director of the National Association of Flight Instructors (NAFI), called early the morning it arrived in his email box. He was off to DC, he said, to meet the with John Lynch, who’s been the FAAer on point for pilot training and certification issues for more than two decades.
Jason kept his promise to call back with any news from that meeting. Nothing would be set in stone until the FAA published the final rule, but it would seem that the changes outlined would come to be as proposed. But that wasn’t the interesting part of our conversation.
Jason brought up the point that if new commercial pilots didn’t need training in a complex airplane, that means flight instructors would not have any training in them either. And for the next half hour we discussed the pros and cons of training pilots and flight instructors to fly complex airplanes, those with constant-speed props and retractable gear.
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NATCA’s New Leadership
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The fact that the FAA and it’s cadre of air traffic controllers will be working with a new leader who will be announced later today is only the beginning of the story of how this union fits into the overall plan of our nation’s airspace system. Outside of aviation, most people didn’t even know there was another controller’s union after PATCO was chopped.
I interviewed both of NATCA’s presidential finalists – Paul Rinaldi and Ruth Marlin – and found them to be bright, passionate and committed to the profession and the industry. Each, however, views the role of union president quite differently. How those views will integrate with FAA and the rest of out industry in both the short and long term make for an engaging podcast.
Rob Mark, editor
Technorati tags: NATCA, Ruth Marlin, Paul Rinaldi, National Air Traffic Controllers Association, FAA, Randy Babbitt, air travel, NextGen, air traffic control