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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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August 3, 1981 – PATCO Strike Remembered
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I remember the morning of August 3, 1981 vividly as I turned on the TV to find news stories of air traffic controller members of the Professional Air Traffic Controllers Organization-PATCO-marching with picket signs at the base of the tower at Chicago O’Hare and other airports all over the nation. They’d simply run out of patience with their employer the FAA and took matters into their own hands.
Many of the people I saw on TV were friends. Most lost their jobs later that week when they refused President Reagan’s ultimatum, “Return to work or you will be fired.” Few ever returned to air traffic control again, in fact.
There’s little point today in talking about how the strike could have or should have been handled. PATCO stuck its neck out and lost. It’s done, it’s over.
What is interesting about our nation’s air traffic control system today nearly three decades later is how little the agency that runs the system – the FAA – seems to have learned from their own mistakes of that era.
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Cole & Kittinger: Hearing History First Hand
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It seems fitting that my fourth decade of EAA AirVenture attendance starts like the first, meeting those who made the history I read about as a kid.
On my first trip to Oshkosh in 1978 I met Pappy Boyington and George Gay (see EAA AirVenture Forums is Where Flying Friendships Form). This year I met Dick Cole, Jimmy Doolittle’s copilot on the flight over Tokyo, and Joe Kittinger who, among many other things, stepped out of a balloon at 102,800 feet and went supersonic without an airplane.
Now, as then, what struck me most about these men is their attitude, their demeanor. They all volunteered because there was a job to do, and they had the training and experience to do it. Standing down was an option never considered. The word “hero” seems to make them ill at ease, as did the standing ovations at their AirVenture forums. They consider themselves ordinary people who faced extraordinary challenges. And they consider themselves fortunate to have survived. Nothing more, nothing less.
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Ken Scott: Multitasking at Van’s Aircraft
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From AirVenture 2008 – Van’s Aircraft is a small company that’s put a big smile on faces who’ve taken to the sky in the company’s line of RVs. The handful of employees also wear big smiles, even after standing in the hot Oshkosh sun all day, because each of them has a number of different responsibilities that keeps the job interesting.
Ken Scott (that’s him on the left, with the sunscreen shiny legs), a long-time friend, is no exception. He edits the builder’s magazine, the RVator, handles all the advertising, produces videos, answers the builder’s help line, and gives workshops and forums. One of his favorite tasks is flying an RV to gatherings like EAA AirVenture; it’s a different one every year, and it’s akin to Christmas with no bad presents, except it’s a lot warmer and, upon arrival, involves standing in the sun most of the day.