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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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Suction Engineers Relieve Shutdown Despair
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Drowning in the destructive rhetoric spewing unabated from self-important politicians, I turned to the sky to relieve the oppressive shroud of despair their words have woven around me. A beautiful autumn day here in Wisconsin, the Sunday afternoon sky is devoid of clouds and airplanes. The only thing that seems to be flying are the Canada geese gathering on the Fox River as they prepare for their escape to the south. Thank goodness for You Tube. This diverse archive of human endeavor, which includes the Dyson airborne challenge, is a distraction and a refuge from the zero-sum games of everyday life.
Dyson Challenge 2013: AirborneI don’t have any experience with the vacuuming designs, but I really appreciate their efforts their engineers put into the Dyson Challenge for 2013: Airborne. They had to create a remotely piloted aircraft that would successfully fly an obstacle course. As you can see in the video, it included slalom gates, flying over, under, and between posts, bars, and balloons, and, from the looks of it, through one of Dyson’s bladeless fans.
The unsuccessful attempts at the course entertained, and the diversity of the flying machines the engineers cobbled together proved that our innovative spirit is not moribund. But the video’s most heartening feature was the supportive and good humored camaraderie of the participants. If only we could, as a society, follow their example. Despite their solutions to the challenge, which ranged from an ornithopter and flying wing to multi-copters, a blimp, and a tradition airplane designs, they were all working toward the common goal of successfully navigating the challenge ahead of them. — Scott Spangler, Editor.
Technorati Tags: Dyson Airborne Challege,Remotely Piloted Aircraft -
Happy Birthday Jetwhine
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Getting old isn’t really so bad, is it?
Sure a few more lines and sags stare back at you every morning in the mirror, but the upside to aging is wisdom.
Jetwhine’s 7th birthday is just around the corner and I like to think Scott Spangler and I are a lot wiser than in 2006 when Jetwhine’s first story ran. Heck, in dog years we’re almost 50.
I figure we must be smarter to have survived an onslaught of social media competitors that surfaced and also died over the past seven years. Of course a few of those forums really are, in Bill and Ted’s own words, “Most excellent,” and opened our eyes to viewpoints we’ve come to respect.
We bloggers till around can’t help but notice that time marching on can sometimes make us a bit too cozy with the way we’ve always conducted business, perhaps no longer stretching that envelope like in 2006 when we published a piece about the value of a blog for the aviation industry, or the piece on the value of a union for air traffic controllers. Of course there was that fun piece on the Top 10 reasons the Northwest Airlines pilots flew past MSP on arrival. Bet they never lived that one down. How could I forget Scott’s story about our industry getting the flight instructors it deserves. That one grabbed over a hundred comments. (more…)
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Midair Refueling is Drone’s Next Challenge
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The refueling probe on this Learjet isn’t the latest option available from the venerable business jet manufacturer. It’s not connected to the airframe’s plumbing, but it is an integral part of a flight test program at Navy Pax River. What you cannot see is that this Lear is also equipped with the navigation, command & control, and vision systems used in the Navy’s X-47B.
As a surrogate for the carrier-based drone, the Lear is assessing the its autonomous refueling capabilities and performance for both Navy and Air Force aerial refueling techniques. There were two pilots aboard the Lear, but they were passengers during the Autonomous Aerial Refueling (AAR) tests. This was just the first step in demonstrating the technology “that will enable unmanned systems to to safely approach and maneuver around tanker aircraft,” said Capt. Jaime Engdahl, manager of the Navy’s unmanned combat air system program.
AAR relies on the same datalink and precision relative GPS algorithms employed in autonomous systems that make it possible for the X-47 to land on a carrier. The next test will happen this fall, when the surrogate Lear, using X-47 software and hardware, will fly a completely autonomous refueling procedure, from rendezvous and plug to safe separation. One wonders what this technology holds for the future of civil aviation.