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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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Will Army Drones Spark Interservice Rivalry?
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Wandering through a Google collection of aviation news, Combat Aviation Brigade Welcomes a New Unit, New Aircraft, grabbed my attention. I’m a dedicated rotorhead, helicopters comprise the majority of the US Army’s fleet, and I was hoping to learn about some new helo.
Nope. In March, the Combat Aviation Brigade of the 1st Infantry Division (aka The Big Red One, based at Fort Riley, Kansas) is getting the Gray Eagle, an “unmanned aerial system” that will be operated and maintained by Company F.
Unfamiliar with the full array of military drones, I assumed that the Gray Eagle was one of the smaller models, like the RQ-7 Shadow, which has a 14-foot wing span. Nope. The Gray Eagle is an upgraded MQ-1 Predator, built specifically for the Army’s recon and air support missions.
In short, when up to speed, the Gray Eagle will do everything the Air Force Predator now does and more, like integrating with Apache attack helos. What’s more, as far as I can tell, the Army drones will be flown by enlisted soldiers, not officers trained first in aircraft they get into.
Given the history of the US Air Force and its aviation battles with the US Army, the service that gave it life. I wonder if the Army drones will be the start of another interservice budget battle and turf war over who flies what aircraft.
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A Monkey in Our Subscription Works
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A college professor of mine told me a story years ago — OK … MANY years ago — about how solving one problem often creates another. Boy … did our switch from Feedburner to Mail Chimp subscriber software — not to mention my recent post about the change — gum up the subscriber works over here at Jetwhine HQ.
First let me apologize to all of you who tried to resubscribe in various attempts and were faced with our monkey screwing things up. It really wasn’t supposed to be this much work.
Our mail monkey has since been sent to his room without bananas to reconsider his behavior.
Seriously, our original goal was to be certain everyone from the old list made it on to the new one.
If you’d like to be sure where you stand and you’d rather not risk the wrath of the chimp, just send me an e-mail at [email protected] and I’ll check the details of your subscription myself. In the subject line, just add the word subscription and we’ll do the rest.
On the bright side of this mess though Scott and I were both really impressed by the incredible number of e-mails we received telling us how important your Jetwhine subscription is to you and how much you like what we write about GA, biz av, FAA, flight training and a host of other relevant issues.
And because you, our subscribers are just as important to us, please keep that [email protected] address handy and e-mail me directly if our chimp ever again fails to treat you with the respect you deserve.
Thanks,
Rob Mark, publisher
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Our Monkey Speaks About Your Jetwhine Subscription
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In case today’s title has you wondering, don’t worry. We haven’t decided to farm our content production out to a cheap, new labor source.
In 5 and a half years of writing Jetwhine, the world has continued to evolve around us although the look of Jetwhine has remained unchanged. technology has not obviously not remained static. The pace of the changes to the technology that support social media behind the scenes however, has been almost enough to make my eyes glaze over at times. And my point is what you’re probably asking about now.
One item long in need of an update here at Jetwhine is our subscription database system … a weakness pointed out a few weeks back by a few of our ever-vigilant subscribers … two folks at AOPA in this case. You know them … best $45 bucks you’ll spend each year.
For you as a reader there is very little if anything to do about our new database … except one. We’d very much appreciate you resubscribing to Jetwhine to verify that everyone has made it over to the new list manager.
Will you please take just a moment and type your e-mail in the box to the upper right of this post, or verify the RSS feed is still connected at your end? If you do, you’ll have made both mine and Scott Spangler ‘s day and we can get back to our real job … providing you the best insights into the aviation industry available anywhere.
As always, if you have a friend who would benefit from reading Jetwhine — and who wouldn’t of course — we’d also be appreciative of you passing on this post about subscribing along with your personal endorsement.
Disclaimer: No chimps were harmed, nor overworked in the production of this post.
Thanks,
Rob Mark, publisher