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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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The FAA Lost Me at “Innovative Solution”
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RSS FeedI was really starting to like the FAA the past few years, what with the Part 23 rewrite and passage if 3rd Class Medical reform. I saw them as more of a kinder, gentler agency … more let’s all work together for the greater good and that sort of thing … until a couple of weekends ago at least. That’s when the FAA performed one of those end runs around everyone, slipping a settlement on Santa Monica airport mess in under everyone’s radar on a Saturday morning.
The FAA’s deal with Santa Monica allows the city to chop up the airport’s single runway as soon as the ink’s dry on the necessary paperwork. That should shrink Runway 03/21 from 4,973 feet to something closer to 3,500, just short enough to make it useless for most jets and even some large chartered turboprops.
I suppose the agency was thinking the good news inside this “innovative solution” as the administrator called it, was that the airport will remain open for business until 2028, if the city hasn’t already driven everyone away by then of course.
But seriously … they see this deal as innovative?
Let me quote Administrator Michael Huerta. “Mutual cooperation between the FAA and the city enabled us to reach this innovative solution, which resolves longstanding legal and regulatory disputes. This is a fair resolution for all concerned because it strikes an appropriate balance between the public’s interest in making local decisions about land use practices and its interests in safe and efficient aviation services.”
A fair resolution? I’m struggling with this one. Sure municipalities ought to have a say in local airport operations, but what about this solution strikes anyone as innovative or fair? (more…)
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Pilots, Aviation & The Paradox of Progress
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A statement or situation that seems contradictory or absurd but may be true in fact is a paradox. “Water, water everywhere but not a drop to drink!” is the paradox for mariners adrift in any ocean. For aviators, the paradox is that progress in technology that makes their flying lives easier is also reducing the number of seats for them in the pointy end of airplanes.If the paradox is not clear, it is the fact that as more and more machines replace human workers the population has increased, meaning more and more people are competing for fewer and fewer jobs.
Ultimately, “automation” summarizes the paradox of progress in a single word. It started with the Industrial Revolution and it continues today. There’s work, work, everywhere but not a job to be had because it’s all being done by machines that are more efficient and, in the long term, more economical.
Technology’s replacement of people is easily seen in aviation. It wasn’t that long ago that commercial aircraft had flight engineers, and before that navigators and radio operators. Looking forward, it should be easy to see a single person managing a commercial aircraft system, first from the aircraft itself, and then from a ground station.
Some will surely say they’d never fly on an aircraft managed in this manner. But aren’t we today cramming ourselves into commercial aircraft systems managed by the two operators who sit up front? To see the future, look back and connect the dots of technology from bonfires to beacons to satellites and from blind flying instruments to autopilots to flight management systems.
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An Airplane Geek for All Seasons
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RSS FeedAn Airplane Geek for All Seasons
I’ve always found keeping up with the demands of social media to be work, quite a bit of it actually. But I think Scott and I also see the work as a necessary effort. Who else is going to dig between the cracks of the aviation industry for stories you won’t hear anywhere else?
Blogging specifically, is an effort that’s come to feel a bit like AirVenture to me. We work to create great content, but what really keeps us going are the people our work brings us together with.
(left) Take this guy, Micah Engber.
We met after Micah, an avid listener to The Airplane Geeks, another growing chunk of social media I’m part of, sent a question about the Kestrel single-engine turboprop project at the old Brunswick Naval Air Station near his home in Maine. Micah mentioned that his 77-year old mom Harriet listened to the show too and in my inimitable way, I managed to stick a shoe-covered foot in my mouth with a comment about her being the oldest listener we’ve ever had … or something like that. (more…)