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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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Monnett Finally Lives His SubSonex Dreams
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John Monnett has been dreaming about a homebuilt jet since the 1980s, so one can only imagine the barely controlled eagerness that filled him with the first flight of the SubSonex. And one can only imagine the internal debate between making that flight himself or turning it over to someone like, Bob Carleton, right, who has the necessary flight experience and, perhaps more important, experience with the PBS TJ-100 engine, which powers Carleton’s Super Salto Jet Sailplane.
But Monnett is the consummate professional, and safety always trumps decades of jet fueled desire. Carlton made the first flight on August 10, and explored the flight envelop from stalls to more than 200 knots true airspeed. Monnett climbed into the SubSonex for his first flight on August 25, and he has built his experience and confidence in the design since then. One happy revelation is that the TJ-100’s fuel economy has been better than expected. As the testing program moves forward, the Hornets’ Nest R&D team has replaced the nose wheel with a retractable unit to improve yaw stability in cruise (and an increase in cruise speed, too!).
A design study for the second SubSonex prototype is underway. Its goals are a larger cockpit, a sleeker nose, and (maybe) a removable wing for easier transport and storage. But the real question is this: As it flies now, how does the SubSonex compare to decades of jet propelled daydreams?
“Doesn’t everyone who has dreamed want one of these? Flying the jet is a hoot! It is like flying a sailplane only a lot faster,” John said. “So far, it has exceeded my expectations. It is, remarkably, very stable and comfortable at lower speeds and gets even better as you ramp up. Looking at the stoic cockpit videos doesn’t give the impression I am having a good time. I can’t think of any other aircraft I’ve flown that is this much fun! Beneath that old man’s skin is a kid again!”
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Autumn Peace & Aviation Inspiration
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Photoguy73 over southeastern Minnesota in 2008.Here in Wisconsin the maples are beginning their fall fashion season. Their shimmering coats in shades of reds and yellows blaze in the afternoon’s low, saturated light. It is a quiet refuge of peace in a world increasingly unable to give and take and coexist without hypocrisy and rancor.
To escape this incessant and self-inflicted turmoil I would give anything to go flying right now, to admire the trees from the still sky. Rather than grow sour about the circumstances that make this now impossible, I sought vicarious refuge in YouTube and found salvation in Photoguy73.
Flying over southeastern Minnesota in the fall of 2008, a powered parachute is the perfect getaway machine. It takes off, climbs, cruises, descends, and lands at the same speed in the mid to low two digits. Add power to climb and reduce it to descent.
You steer with your feet, so your hands are free to take pictures or, as Photoguy does midway through his low-level flight, wave to a farmer pacing a corn field in his combine. Think of it as a La-Z-Boy with a seat belt and shoulder harness hanging under a ram air awning.
What makes this flight special is the soundtrack of vocal tunes that tell of a better time, of what America has to offer its citizens, if they weren’t so busy trying to get theirs at the expense of others. Huh. Maybe I should go for another flight with Photoguy. — Scott Spangler
Technorati Tags: Powered Parachute,Autumn Color Flight -
User Fee Battle Still Raging … so Get Moving Today
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Everyone knows about the user fee battle.
How could you not. Current attack aside, we’ve been in this fight on and off for years. The problem though is that when you hear similar stories from a dozen different blogs, magazines, podcasts and Twitter feeds you become numb.
That means thousands of aviation supporters are probably thinking about the current user fee battle, but doing little else.
Right now, we need thousands of you who have been planning on raising your hand against this current assault, to click any of these fine sites — General Aviation Airport Coalition (GAAC)
or the National Business Aviation Association (NBAA) or the Aircraft Owners and Pilots Association (AOPA) – and sign a petition and a letter to your individual members of Congress telling them to say no. It will take 30 seconds … no more, really!
If you promise to do this right now, I’ll spare you my regular the political diatribe about this President’s inability to grasp the value of our aviation, or any rants about what the Republicans did or what the Democrats didn’t do to bring this on.
But please, make this move today, as soon as you finish the next sentence. We only need 30 seconds of your time to fight a proposal that will seriously change the industry we love forever. Trust me, your vote WILL COUNT.
General Aviation Airport Coalition (GAAC), the National Business Aviation Association (NBAA)
or the Aircraft Owners and Pilots Association (AOPA)
And one more thing … please, please please pass this note on. We need 30 seconds from everyone you know too. Thanks.
Rob Mark, Publisher