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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.
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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Paper, Airplanes, and Automated Aviation
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Rarely are the dots so closely connected to an epiphany that turns a train of thought on the future of automated aviation in the opposite direction.
The first dot was an August 29 New York Times story, Humans Take a Step Closer to “Flying Cars’, which discussed the first flight of the SkyDrive, a single-seat quadcopter. Its batteries enabled a flight of just a few minutes at an altitude of 3 meters. The article said that it was a long way from the necessary useful load and endurance necessary to make such a flying car practical, not to mention the necessary automated aviation and air traffic control tech and operator training that would make flying car operation safe for the masses. Being a perpetual skeptic, I doubted that the flying car dreamers would every achieve this.
The next dot was another New York Times story, August 31’s Drone Delivery? Amazon Moves Closer With FAA Approval. Amazon’s earning a Part-135 air carrier certificate for its fleet of Prime Air drones took the next step toward realizing the dream of a workable flying car and its cousin, urban air mobility. In submitting the evidence of the safety management systems and other information needed to earn a Part 135 certificate, and to demonstrate those operations to the FAA, earning the certificate was an “important step” in developing its automated aviation delivery technology.
Company officials offered pragmatic conclusions on the future. The article quoted Prime Air Vice President David Carbon: Earning the Part 135 certificate “indicates the FAA’s confidence in Amazon’s operating and safety procedures for autonomous drone delivery service that one day will deliver around the world. [Amazon will] continue to develop and refine our technology to fully integrate delivery drones in the airspace, and work closely with the FAA and other regulators around the world to realize our vision of 30-minute delivery.”
Finally, there was the story from Flying (and other sources), Xwing Flies Cessna Caravan Autonomously. This takes the Amazon drone delivery to the next level, and the tech involved seems related to Garmin’s Autoland system, which the FAA has approved for the Piper M600 and Cirrus Vision Jet. These accomplishments further eroded my skepticism of near-term arrival of pilotless commercial aviation.
The epiphany that brought my skepticism to a dead stop and turned it around was in the opening pages of Mark Kurlansky’s fascinating book, Paper: Paging Through History. What’s the connection? “Technology does not change society, society changes technology,” he wrote, explaining that, regardless of its form, technology is a practical application of knowledge. “There is a tendency to imagine that technology is a Pandora’s Box, that once a new way is initiated, it unavoidably falls into use and is unstoppable. But when a technology is invented that doesn’t correspond to the needs of a society, it falls into obsolescence.”
When it comes to commercial aviation, what is most important to the society of decision makers will become transparent on October 1. That’s when the federal airline bailout requirement to not fire or furlough employees expires. United Airlines has already queued up more than 16,000 employees, American Airlines also seems to be in this queue, as do other airlines.
As has been the case since the 1980s, what are most important to society are the bottom line and the benefits accruing to corporate shareholders and the executive to reap the bonuses and the for-hire politicians who support this now entrenched way of life. Employees who create and provide the goods and services, and the customers who consume them, are little more than economic fields to be harvested or sacrificed as the bottom line and dividends demand. To this end, automated aviation that does not need pilots cannot get here soon enough, and it will be here in good time. — Scott Spangler, Editor
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Staying Dry & Distant at the EAA Museum
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With thunderstorms lined in assaulting waves on radar and pathfinding drops splattering themselves against my office window, changing my Saturday morning plans for a two-wheel ride to Rio, Wisconsin, seemed prudent. Remembering that the EAA Aviation Museum had reopened on the previous Monday, a visit there would be interesting on several levels, especially since it has been several years since I last paced my way around its winged occupants.
Turning into the museum driveway, the blue signs saying the EAA grounds were closed to the public were gone. Orange cones funneled me to a forkliftabale light taupe AirVenture kiosk that sheltered a man with a mask. He asked if I’d been out of the state anytime in the past two weeks. Nope. Did I have any respiratory problems? Nope. Did I have a fever? Not that I know of. Drawing from some unseen holster, he held a temperature-sensing pistol to my head. It beeped. He asked one more question: Did I have a mask? Yup, it’s in my pocket.
Parking beyond a cluster of maybe a dozen or so cars, most of the license plates I passed were from Wisconsin, with a few from Michigan and one from Minnesota and another from Indiana. It seems the Illinoisans were taking their states quarantine requirements for anyone from or visiting Wisconsin seriously, or was that just for people living in Chicagoland?
Four signs led me to the front door. The first said masks are required for everyone 5 years and older. Next, museum attendance was limited to 150 people, and if it were full, you’d have to wait outside until someone left. EAA would prefer admission payment with a credit card, but it would still accept cash. (EAAers just need to show their membership card.) The final sign graphically dictated the distance and hand-sanitizing parameters of social distancing.
After showing my membership card to the nice lady behind the Plexiglas screen, instead of saying hello to the cluster of docents that usually awaited visitors just steps into the museum proper there were just more signs. One reminded everyone to maintain 6 feet of distance. The other said the hands-on exhibits, the Johnson Wax S-38, Willan Space Gallery, KidVenture, the cockpit, Wright Flyer, and powered parachute simulators, were closed.
But the faint scent of airplane still permeated the calming museum half light, as it always has. Shrugging off my inability to remember when I’d last visited, I set off on my atavistic path forged when I needed to stretch my legs or clear my mind when my office was on the other side of the museum’s doors (and it was, like this day, raining). A new model of the Graf Zeppelin overlooked the Wright Flyer in its usual place below me, at the bottom of the stairs. Behind me, I could hear Steve Buss, a friend and former coworker, narrating the film playing in the Skyscape Theater.
Stickers on the balcony railing indicated the desired distance between those overlooking the airplanes below. The composition of Van’s Aircraft RVs was new. So was the prototype Christian Eagle on a vertical line in the aerobatic gallery below. Behind me, a tape barrier put all of the hands-on aerospace physics experiments in the Willan Space Gallery out of arm’s reach. Around the corner, a similar barrier blocked the automatic whooshing sliding doors that led to KidVenture. An Aviore mural has replaced the outer space theme artwork. Interesting.
Stopping on my way to the Eagle Hangar, the bathrooms were open but the bubblers (drinking fountains to out-of-staters), were swaddled in black garbage bags and green packing tape. Given its tertiary use as an event space, the arrangement on the hangar deck changes often, or it did until the pandemic rearranged life. The fixed displays, the prototype P-51 and the F4U-4 that dominated the Navy corner on the opposite wall, hadn’t moved. But the reassembled Spanish Bf-109 Messerschmitt now flew above the P-51 at balcony eye level.
The dewinged Messerschmitt used to reside on the opposite wall, in a canvas nook festooned with Top Secret signs, because it shared the space with a replica of the Fat Man, the plutonium bomb that fell on Nagasaki 75 years ago tomorrow, August 9. In its place was a Bell UH-1B Huey. Descending the stairs at the far end of the balcony, I made my way across the floor to investigate it.
On the final panel telling of the Huey’s history, I found a surprise, a photo I’d taken from the USS Blue Ridge, command ship for the evacuation of Saigon in 1975. It capture the moment an ARVN pilot stepped out of a Huey. It captured the pilot’s fifth and final such flight. With his family, he’d arrived the night before in a CH-47 Chinook, which he later ferried to the USS Midway. With room for just one helo on the flight deck, he’d volunteered to ditch the Hueys so the next one could land. When the helo’s he’d ditched at lower altitudes almost fell on him, he started stepping out of them at higher altitudes. After he’d injured his ankle in the pictured hundred-foot fall, the flight deck crew started pushing the empty helos over the side.
Working my way back to the corner, I paid homage to Ernie Gann at his Chicken Coop writer’s shack. Peeking out the back door and seeing it rain free, I followed the path to Pioneer Airport. It was unchanged, except I don’t remember the flat right main-gear tire on the Ryan SCW, in the eponymous hanger of its manufacturer.
Making my way down the line to the vacant Air Academy lodge and Compass Hill, I notice a stack of blocks that were building new panels at the EAA Memorial Wall. What many may not know is that part of this area, between the wall and the memorial chapel, is a registered cemetery (I was even on its board for a time during my EAA employment). It is a small plot, and I went looking for the headstone that, when I’d last looked at it, was engraved with the names and birthdates of Paul and Audrey Poberezny.
Paul passed on August 22, 2013, and I wondered if EAA had added this date to the headstone, which bears the words, “To Fly” under the wings of a US Air Force Command Pilot. It took me a while to find it, but there it was up a few stairs on the sidewalk behind the chapel.
Maybe they moved it to accommodate the additional Memorial Wall panels; regardless, its inscriptions were unchanged. Maybe he’s waiting for his wife (and EAA’s mom), Audrey, who was born in 1925, four years Paul’s junior. I’d pass her assisted living facility on my way home. Looking skyward, the clouds suggested that I get a move on. — Scott Spangler, Editor