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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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Kites & Combat: Aviation Surprises Revealed
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Surprises are delightful, especially when they reveal innovative and economical ways aviation solves a problem in a unique way. The latest example is the maneuverable kite Paul Garber (yeah, that one, the father of the Smithsonian’s Air & Space Museum) designed during World War II to train shipboard anti-aircraft gunners.
Rather than a dangly tail the kites, which spanned five feet or more, had a rudder that enabled the maneuvers shown below. The kites came in a crate of 25, with repair kits, if crews were able to recover them after the crews on .50 caliber machine guns and 20 mm and 40 mm Bofors gun mounts finished with them. According to the World War II training film, the kite fliers needed at least a 10-knot breeze to fly.
The complete history of the kites, made by Spalding and Comet Models, is available on its website. I spent an enjoyable and educational afternoon there, reading everything about the kites instead of researching the topic that led me to them.
Established shortly after Pearl Harbor, the WAVES opened a number of aviation jobs, such as aviation machinist mate, aviation metal smith, aerographer, and parachute rigger, to women. They also served in specialist positions such as air traffic controller and aerial gunnery instructors. The last is where I learned about the kites. In the Navy, aerial gunners are those who shoot at airplanes with small caliber weapons. Those who pulled the trigger on bigger guns, the three, five, eight, and 16-inchers, were referred to as naval gunners.
My afternoon ended in a wave of nostalgic longing. After the war, the Office of Aircraft Disposal had to sell 130,000 surplus kites, along with all those unneeded airplanes whose value then was often measured by the amount of fuel in their tanks. They went for $2.65 each, in lots of 7,500 or $2.79 in smaller lots, with all purchases in multiples of 10 or 25. Hmmm, I wonder what today’s targets cost. — Scott Spangler
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My Weekend with Google: Beware of Free
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Few folks I know in the aviation industry doubt the value of social media for making the industry more … well, social. Mike Miley and Rod Rakic at MyTransponder.com have developed an entire Facebook-like enterprise around the entire concept of making our industry more social, in fact. It’s something we sorely need by the way.
What makes the process so easy is that most of the tools to engage with other airplane geeks are free and relatively easy to use.
Our show, The Airplane Geeks in fact, uses SKYPE as the primary method of bringing all the hosts together at one time, no small feat when they live on three different continents. Despite free, we all know problems pop up, like this weekend’s major SKYPE cough just as we were recording the show. We’ve learned to brush it off though since 99% of the time everything works just fine.
Google, of course, is the 800 pound gorilla on the net these days and offers a host of free services that make airplane-geeking even easier. But beware of that free price tag. You certainly get what you pay for, a concept brought home to me this weekend when I apparently enraged the monster in Mountain View.
It started with a Jetwhine Tweet hoping Google would squelch what seems to have become a monthly affair … changing it’s free apps to better serve me.
Good Grief Google! Can you PLEASE stop giving my Gmail and apps a new look and feel every month. You’re making us crazy … OK, crazier.
Next thing I knew, my Google-owned YouTube account was destroyed. No warning of any kind, just a big whack of the Google chopping knife reserved for bad guys, of which I’d apparently become one.
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Online Publishing Gives Air Facts New Life
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At AirVenture a friend asked if I’d seen the new Air Facts. What new Air Facts? All I knew about were the Air Facts videos Richard Collins produced with Sporty’s Pilot Shop that grew out of the eponymous print publication Leighton Collins launched in 1938. (Collins sold Air Facts in 1973, and changes made by the new owners were its demise.) Yup, she said, but it’s now an online journal, a continuation of the productive collaboration between Collins and Sporty’s.
It was worth a look, if for no other reason to see if it made a successful leap from old school to new. Having seen a number of the original digest-sized magazines in various library archives, it was a first-class publication dedicated to the safe and productive use of airplanes as transportation and noted for its prose. During its lifetime Air Facts launched the aviation journalism careers of Richard Bach, Bob Buck, Richard Collins, Bill Mauldin, and the immortal Wolfgang Langewieshe.
Okay, I’ve only spent about 45 minutes browsing this online journal, but it is worth a frequently visited bookmark in any pilot’s list of favorites. The site is well designed and organized with top flight prose categorized as features, opinion, and “Air Mail.” There’s even a comprehensive library of Richard Collins’ Air Facts videos. They’ve even recreated a number of the original Air Facts stories that are still relevant to pilots today.
A distinctive aspect of the original was that its readers submitted a large percentage of the content. The same is true with the online publication. Early in its online life, they include Richard Collins, Bob Buck, Russell Munson, Phil Scott, Hal Shevers, and Bob Stangarone, who, like Collins, got his start at the print Air Facts. The articles not only talk about how to fly someplace safely and efficiently, several talk about places to go.
Now, if you’ll excuse me, the time for browsing Air Facts is done. It’s time to read. — Scott Spangler
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