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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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Woracle: Aviation Blogger Astounds and Mystifies
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If you haven’t read Graham Warwick’s blog – the Woracle – you’re missing something spectacular. I’m always amazed at the cutting-edge topics he covers.
But maybe he has more time on his hands because the English already have a new prime minister and we’re still in the muck trying to figure out who our next president will be. Or, of course it could just be because Warwick is an editor at Flight International.
No matter what, head over and read his piece about the new Pulse Detonation Engine attached to a modified Long EZ. It will make your day.
But don’t forget to come back. I’m met Warwick and trust me on this one, Jetwhine’s editor – that’ me BTW – is way more handsome!
Technorati tags: flight international, Graham Warwick, The Woracle, aviation blogging, Jetwhine
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Is Technology Killing Sport Pilot’s Future?
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Simplicity and affordable flying for fun were the driving forces that sustained the sport pilot/light-sport aircraft effort during its 10-year path to reality. In short, it was supposed to be flying unplugged — stick and rudder, look out the window and enjoy the view.
That may be the goal of those who want to fly a light-sport aircraft, but it seems that technology is all that matters to those who are selling LSAs, and selling the idea of becoming a sport pilot.
Don’t get me wrong. Glass cockpits in light-sport aircraft makes perfect sense to me. With fewer components and easier installation, glass costs less than steam gauges and their associated plumbing, and that helps contain the cost of a light-sport aircraft. But what about autopilots? It’s an easy addition in the world of glass, and at least one LSA manufacturer is offering it as an option.
Making technology the anchor of the SP/LSA marketing effort is, I fear, a mistake. It may work well when selling airplanes for IFR transportation, but that’s because the buyer, whether it be an airline, corporation, or individual who needs to go places efficiently and economically. LSA buyers and sport pilots are, I think, still motivated by the romance of VFR flying, and there’s not much romantic about flying a video game.
No disrespect to the industry leaders I listened to at EAA AirVenture Oshkosh last year, but as the father of pilot-age sons, a glass cockpit is not going to entice them skyward because it connects with their inner video-gamer. My boys fly often in virtual skies, and they’re always yankin’ an banking–with the instrument panel turned off.
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VLJ Training Means Thinking Differently; Survey 2
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Bob Barnes is already looking at VLJ training from a different perspective, one way he hopes to prevent a rash of human-caused accidents once aircraft deliveries surge to low-time pilots as I mentioned a few weeks back,
And as the voluntary chairperson of the International VLJ Training Stakeholders’ Discussion Group, he’s actually not alone. Most of the group’s members are also worried that the VLJ may experience a surge of early deliveries and rapid growth followed by a series of tragic and preventable accidents. They’d like to help stop that by developing a series of VLJ training best practices.
The early results of the group’s first survey last month – nearly 400 people took part – revealed virtually all members believe the need for some sort of VLJ training best practices are vitally needed to prevent a redo of early Piper Malibu-like crashes that soon focused around questionable training standards when they were sold to low time pilots.