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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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Father’s Day 2017
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RSS FeedFather’s Day is special to me for a couple of reasons.
My own dad is gone, but of course I’m a father myself so it seems like the idea’s certainly living on in our family.
But my talented buddy Micah – you might know as our Maine Man from the Airplane Geeks – sent this to me a few weeks back and asked if I’d like to give it a listen. I did and realized it’s absolutely worth sharing with other folks whose own pops, dads, or fathers have passed on, because Micah’s sense of story telling is worth spending a few minutes of your Father’s Day on.
Here’s Micah’s piece called My Six-Foot Father.
Happy Fathers Day everyone.
Rob Mark
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Erudite Aviators Provide Solace & Solutions
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Looking at the challenges aviators face foretells of a seemingly insurmountable struggle to sustain our beloved avocation that is, for a lucky few, also an occupation. What makes this situation worse is that most of these challenges pit aviator against aviator.
The summit of challenge mountain is the proposed privatization of ATC. Supported by airline aviators, the user fees that would support it would, it is safe to assume, eliminate the ticket taxes the airlines pay on each passengers base ticket, which does not include the plethora of additional fees. In its place, the airlines would add the ATC user fees to their ticket prices. Business and general aviators would have to make life-changing financial choices if they want—or need—to continue flying.
Other challenges are more insidious because they are unintended consequences of aviation’s technological solutions in its ceaseless quest to improve safety. Take, for example, FAA Safety Alert for Operators (SAFO) 17007, Manual Flight Operations Proficiency. It urges aviators to maintain and improve “the knowledge and skills” they first mastered as students, manipulating the stick and rudder for a safe flight.
The challenge here is not mastering the necessary knowledge and skills. It is finding the appropriate balance between the contribution technology makes to safety and the aviators ability to realize when he or she needs to take over, and to have the current stick-and-rudder muscle memory essential for maintaining that safety.
When considering the logical and disparate possible outcomes becomes morbidly oppressive, I seek solace from the erudite aviators who live on my bookshelves. From them I intuit solutions to today’s challenges, should aviators today choose to make the changes necessary to achieve them.
To many, Nothing By Chance, Richard Bach’s 1969 book is a nostalgic tale of a group of aviators who spend the summer living the barnstormer’s life. But it is so much more, if one reads carefully. It shows how a group of aviators, with different needs, achieved a shared goal financed by an unpredictable number of $5 flights. Naturally, these humans had their disagreements, but in the end they worked them out to the benefit of all. A similar outcome is possible if the spectrum of aviators unite in opposition to a privatized ATC system funded by user fees and agree on possible solutions that benefit all of aviation, not just one of its communities.
Any aviator who manipulates an airplane’s controls should sit down with Wolfgang Langewiesche at least once a year, just to remind themselves that the fundamentals of flight he analyzed in Stick and Rudder are universal to all fixed-wing aircraft regardless of size. Then sit down with Michael Maya Charles who melds hands-on manipulation with the human metaphysical factors that play a critical role in their acquisition, sustainability, and employment.
Beyond solace, spending time with these erudite aviators may also inspire solutions to the challenges that the industry—and its individual participants—today face. But they will not be explicitly clear on the page, they will grow in the reader’s mind, especially one prepared for the implantation of new ideas by a sufficient supply of imagination unbounded from what was and what is, freed to consider what could be. — Scott Spangler, Editor
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Why America Reallocates Public-Use Airports
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Public use airports are an essential (and underappreciated) component of America’s infrastructure. The current total, provided by the the Bureau of Transportation Statistics, counts 5,145 public use aerodromes. What’s really interesting about this timeline is the increase between 1980 and 1985, from 4,814 to 5,858 public use airports. The total dropped to 5,589 in 1990, the next stop on the timeline before the annual counts reveal a trend of small and steady decline.
The sudden increase in airports between 1980 and 1985 surprised me because it came after general aviation’s leap off the economic cliff in the late 1970s and early 1980s. Search as I might, I could not find a concise summation of why this period experienced a boom not unlike the increasing number of babies born after World War II. Until I find something more authoritative, I’m settling for the logical conclusion that airports aren’t born and don’t die overnight, so the boom was the result of poor timing and the interval of new airport gestation.
My research did reveal interesting examples of why airports die, and why new ones are born in this era of economic stasis for our infrastructure, either maintaining what exists or adding to it.