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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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ATC User Fees; It’s Crunch Time with FAA
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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…)
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Will Communications Improve at Eclipse?
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Andrew H. Broom and I don’t know each other. We’ve never met and I don’t owe him any money, nor he any to me. At least none that I recall.
What we do have in common is an infatuation with an incredible airplane concept and the need to tell a good story as accurately as possible.
Broom is the director of public relations at Eclipse Aviation Corporation in Albuquerque.
Eclipse has enjoyed major press coverage – not all of it good – almost from the day the concept of a Very Light Jet (VLJ) became public nearly 10 years ago. Love them or not, most VLJ publicity today still points to Eclipse as the vanguard of the movement, something no one else can claim.
Andrew and I spoke the other day about communications and the aviation industry, specifically how Eclipse views their own coverage, after I began to wonder what it must be like to be on his end of the telephone and a computer monitor rather than mine. Actually, I have been on the PR side of aviation communications come to think of it. (more…)
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Airbus A380 was a Brilliant Aircraft
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Despite an edict from the City of Chicago’s Department of Aviation warning people away from O’Hare Airport on Tuesday, the A380 crew plunked it down nicely on runway 4 Right to the cheers of the limited crowds who were able to find a place to watch.
The city sent out a news release Tuesday telling the local riff raff they risked their vehicles being towed if they even appeared to clutter up the roads near the World’s Busiest Airport. And for those of you non-Chicagoans, yes, this is the same Mayor Richard M. Daley who sent his bulldozers out in the middle of the night a few years back to transform Meigs Field into a new lakeside park.
In a continuing search for the truth, however, this reporter risked being ticketed and towed – I had my Visa card with just in case though – and can only say that I watched a piece of history sail by for a few moments that day. (more…)