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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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Homebuilding: Complexity is the Price of Progress
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After reviewing thousands of comments about the fed’s proposed policy and procedural changes affecting the 51-percent rule, the Amateur-Built Aviation Rulemaking Committee completed its mission, submitted its final recommendations to the FAA, and called it a day.
Its mission was to address the problem of pilots who circumvented the rules by hiring a pro to build them an airplane.
We won’t know how the FAA will respond until it publishes the new policy (at or just before EAA AirVenture Oshkosh 2009), but what’s almost certain is that builders (real and pretend) won’t like it. Based on past experience with government, it probably will not stray far from the proposed changes the FAA released before EAA AirVenture 2008. What the FAA proposed was immediately criticized as complex, a burden that would stifle innovation.
Perhaps. But why should homebuilding be exempt from the rule that affects every aspect of American life? Complexity is the price of progress, of innovation, of finding easier, cheaper, and more efficient ways of doing things. Regardless of where we reside, Wall Street or Airport Drive, our actions determine our daily reality. In searching for someone to blame, we should first look in the mirror, because the actions of a few reflect on us all.
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Jetwhine Wins a Webbie
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The past six months have not been easy for the aviation industry, or any other industry quite frankly, as we’ve all witnessed the bottom falling out of the marketplace. No one has any idea whether we’ve actually hit the bottom or not, nor does anyone know which soothsayer has the magic dust we need to recognize the bottom when it does appear. There is light at the end of the tunnel. I just think right now that beam is too dim for anyone to notice.
Despite all the truly ugly news lately, something really nice and completely unexpected occurred while I was driving to lunch on Monday, something that made me pull over and take a deep breath. Long about mid afternoon, my Twitter account lit up with congratulatory notes from friends being sent to my iPhone. “Nice job,” “jetwhine Speech speech! Congrats again!” and then there was, “Congrats on the honors. I admire the work you have put into your site and I’m glad someone else appreciates your work as well.”
Of course I’m reading these notes thinking what a nice bunch of folks my blogger/Twitter friends are. I was also completely clueless about the topic. Finally, at lunch I began Tweeting back asking for an explanation because I was sure someone was pulling my leg.
Then came the news from another Jetwhine reader … “Don’t tell me you’re the last to know Rob. Jetwhine won a Webbie as Best Aviation Blog of 2008.” I was numb for a couple of seconds before I started cheering, confirming of course, that I indeed don’t get out enough.
The folks at Flightglobal named Jetwhine, along with a couple of other first-class comrades in blogging, The Cranky Flier and Nuts About Southwest as the Top 3 Blogs for 2008. I was very pleased just a few shorts weeks ago to host Paula Berg, Southwest Airlines manager of emerging media, as a speaker to my Integrated Marketing Communications class at the Medill School of Journalism at Northwestern. We’ll have to try and get Cranky Flier out next term.
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Callback Choices: What Would You Do?
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Like a lot of aviators, I like to read about the problems faced by other pilots to learn how they dealt with them, and to refresh my memory of lessons I’ve already learned. A number of aviation publications present these scenarios, but none beats Callback, the monthly publication of the Aviation Safety Reporting System, run by NASA.
The January issue, which arrived last week via email notification, offered an interesting–and valuable–interactive component. The issue’s introduction inferred that it had done this before, but because I’ve only recently started reading it again (see Getting Reacquainted With NASA Callback), and I must have missed it.
Callback set the scene for four situations, one from a GA pilot, one from an air traffic controller, one from an air carrier flight crew, and one from an airline captain. In each of them, readers get to to answer this question, “What would you have done?” by selecting one of the four possible outcomes.
Preparing for a cross-country over the mountains, the GA pilot got a DUAT briefing and “interpreted” CAVU weather for his route. At the mountains he found poor visibility under the clouds. Receiving flight following since departure, he told ATC that he was climbing from 8,500 feet to get over the clouds. At 10,500 feet he saw that the “line of clouds” was an overcast, and as he continued toward his destination, he climbed to stay above it, eventually reaching 14,000 feet, without oxygen and reaching his airplane’s service ceiling.