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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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Lessons We’ve Already Learned from MH370
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While it may seem to many of you as if the Malaysian Airlines 370 story has been going on forever, we’re really only into the opening scenes of this investigation. Remember it took two years to recover the data recorders from Air France 447.
Lessons we’ve already learned from MH370 Even though everyone seems to believe we’re close to the area where MH370 hit the water, there still hasn’t been a single ounce of evidence recovered from the ocean’s surface in that area. I would have thought something would still be floating … suitcases, seat cushions, clothing … something.
Be that as it may, even if the boxes are found, they’re sitting on the ocean floor three miles beneath the surface which means the recovery effort is no small task.
The Chicago Tribune last week asked me to write an editorial putting what we know into context. It ran Friday and I focused on the fact that there are already plenty of good people leading the search efforts and the why behind most of this accident will come later. But I do think we have already learned quite a bit about where the airline industry needs to head in the next few years … if we can just convince the airlines of course.
During a radio interview on Friday, the host asked me about Plan B if these signals turn out not to be from MH370. Honestly, there is no plan B …
Because the Chicago Tribune website made it a bit difficult for many of you to read the story, I’ve pasted the text in here, as well as the direct link if you’d like to sign in there to read more. Do tell me what you think.
Rob Mark, Publisher (more…)
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First-Person View and Recreational Flight
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From the first time we looked up, what has attracted humans to flight is seeing the world from the perspective of a bird. That attraction still drives many of us, but how we achieve this first-person view (FPV) has changed with technology. If you doubt this, think about all the cool video on the Internet that has been captured from drones.
From a mass-market mindset, which would you rather do to satisfy your desire to see the earth from above: Spend $10,000 and a year of your life to become a pilot and then pay upwards of $100 or more for an hour’s flight; or invest $1,200 or so for a ready-to-fly small drone like this DJI Phantom 2 Vision, spend several hours mastering its GPS-stabilized flight control system, and recording that aerial first-person view on your smart phone?
Given the number of drone videos posted on YouTube, I’m guessing that these flights, which usually last less time than it takes to thoroughly preflight a Cessna 172, will totally satisfy the aerial FPV cravings of most people born during and after the 1980s. Let’s face it, if a smart phone is involved, it’s a winner among people who text rather than talk, even when they are sitting at the same table.
For those of us born before the 1980s, this evolution of recreational aviation doesn’t bode well for fun flying as we remember it. But such is the nature of progress. Yes, for a few who look skyward, drones will not be enough. They will be the generational outliers who invest the time and money necessary to collocate their body with their view. And they will be the ones who get hands-on to build and restore the flying machines that stirred their dreams.
But their numbers will never replace the pilots who’ve since retired from the cockpit. And I’ve talked to a number of them who’ve traded their airplanes for a FPV drone. With the advent of FAA small drone regulations, today may well be their “good old days,” which should not be missed. — Scott Spangler, Editor
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The Aviation Minute: Episode 6 – ICAO and MH370
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RSS FeedThe past month has been one of amazement for most of us in the aviation industry as millions of people around the world try and figure out what happened to Malaysian Airlines flight 370.
CNN decided to go 24/7 with MH370 coverage, while I was happy to help the Fox News people with their own news analysis on the disappearance.
But here we are nearly a month after the Boeing disappeared and we’re only slightly closer to finding the airplane than we were in March. One of the biggest stumbling blocks of course has been the Malaysian government itself, that was woefully unprepared for such a calamity. Answering questions and researching news for Fox and for an upcoming book really got me thinking that it’s time to talk about the future of this industry. I’m not giving up on the people aboard MH370 of course, but we need to decide what lessons the next generation of aircraft designers, pilots and passengers must take from MH370 as it stands today.
With that, I offer you the next Aviation Minute.
The Aviation Minute: Episode 6 (for e-mail subscribers)
Rob Mark, Publisher
BTW, I owe those of you who receive The Aviation Minute on e-mail a huge apology. I had no idea you’d be unable to access the podcast player directly. While I work on a more permanent solution, I’ll continue adding a hyperlink to the episode as I did above which will allow you to listen to the episode.