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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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Who Knew: 60-Month Student Pilot Ticket?
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Am I the only one who missed the news in July 2010 that the FAA nearly doubled the life of a student pilot certificate (and the third-class medical certificate) for those 40 and younger, from 36 months to 60 months?
This discovery came with a question from JetWhine Publisher Rob Mark. He sent a link to the FAA Certificated Pilots 1929-2011 page on the AOPA website and asked, “Something weird about student starts here. Are they adding them all together?”
The table showed 72,280 active student tickets in 2009 and 119,119 in 2010, with an estimated 115,000 in 2011. The fine print told of the ticket’s new lifespan and said it was behind the significant increase in the student number. At first glance it seems like good news, until you see the 4,119 decline in the 2011 student estimate.
A more accurate—and telling—number is found on the FAA website, on Table 17 of the US Civil Airmen Statistics: Original Airmen Certificates Issued 2001-2010, a section of which is shown above. Original certificates issued is aviation’s birthrate, the number of newborn pilots joining the family. Look at the number of student, recreational, sport, and private tickets issued. The story they tell is not good for aviation’s future. Given the economy, anyone want to guess what the 2011 numbers will look like?
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Pilot or Panic?
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There’s no small amount of irony in the fact that Rockwell Collins announced it’s new “One Touch Safe Mode,” button at the Paris Air Show this week … at least it was ironic to me.
The button, integrated into the avionics giant’s popular Pro Line Fusion integrated flight deck avionics system, is designed as a fail safe to grab the flight controls from the pilot and right the airplane should the pilot — or pilots — find themselves unable to do so.
French airframe manufacturer Airbus is based in Blagnac near Toulouse just an hour’s jet flight south of Paris’ Le Bourget Airport. Airbus, of course, as well as Air France, have been inundated with the kind of publicity no company wants after the loss of Air France 447 two years ago. Initial BEA reports indicated pilot error, as in complete loss of control of the aircraft, was a distinct possibility.
Now I certainly don’t fault Rockwell for building this new fail-safe technology mind you. They’re simply your typical multi-billion dollar manufacturer of some really intelligent electronics and after testing these panic buttons in unmanned aircraft, decided the business jet market was ready to accept the option.