-
Making the Brazilian ATR-72 Spin
by
No Comments
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…)
-
How the FAA Let Remote Tower Technology Slip Right Through Its Fingers
by
No Comments
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…)
-
Brazilian Air Traffic Controllers Will Work for Food
by
No Comments
I received quite a few private pieces of mail about my post on the Brazilian air traffic controller issue last week, so I thought I’d share something I learned after speaking with Marc Baumgartner, president of the International Federation of Air Traffic Controllers (IFATCA) in Switzerland this morning.
The air traffic control crisis was so bad last week in Brazil, that while the original purpose of the work stoppage was, of course to gather attention for the plight of the controllers and their differences with the military run ATC system, the chaos was serious enough that controllers refused any food during the first 24 hours of the strike. (more…)
-
ATC in Brazil is Out of Control
by
No Comments
Just when pilots and flight departments began to breath a little easier about flying outside the U.S. comes word that the Brazilian air traffic control is finally coming unglued, much the way many predicted after the midair collision over the rainforest last fall between an Embraer Legacy and a Gol Airlines Boeing 737.
The Brazilian government released the two U.S. Legacy pilots last December, but not before calling them the responsible parties in the mess.
Early on after the accident, speculation seemed to point to the ATC system in South America’s largest country as, at least, a contributing factor. But the Brazilian government would hear none of that kind of talk and insisted the U.S. pilots had purposely turned off the Legacy’s transponder disabling the TCAS system on both airplanes making avoidance impossible.
Not surprisingly, the Brazilians could not explain any reason why the pilots would try something so ridiculous. But the smoke screen did take the heat off Brazil’s strained military run air traffic control system, at least for awhile.
In a move that surprised no one, except perhaps the government last Friday, Brazilian air traffic controllers called a strike. Adding insult to injury, the Brazil controllers who struck were mostly members of the military. (more…)
-
ATC User Fees; It’s Crunch Time with FAA
by
No Comments
Airlines are Pulling Out All the Stops
FAA Administrator Marion Blakey expressed surprise recently at the heat her user-fee proposal generated so far with industry professionals, but also from Congress.
Blakey was shocked … shocked mind you, at hearing criticism, but few helpful ideas on how to gather the buckets of cash she says the agency needs to update the U.S. air traffic control system.
The White House – with a whole lot of help from the FAA and the nation’s airlines under the guise of the Air Transport Association – is convinced the current funding mechanism will run dry at the end of September and bring updates to the ATC system to a grinding halt. Unfortunately, no one, at least not anyone outside the airline industry believes FAA has made its case for the chaos they predict in the funding system. Nor does anyone believe FAA is the organization to fix ATC’s systematic ills.
Most importantly, we all need to see this proposal for what it truly is … a way for the airlines to gain some control over an element of aviation they have come to see as a significant competitor. (more…)