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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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Airlines and Ashes
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With tens of thousands of travelers stranded all over much of the Western Hemisphere still trying to either get to or from major European destinations last week, airline management became understandably tense at what was indeed the worst travel crisis since 9/11. The Chicago Tribune reported that of the U.S. airlines, Delta lost the most during the standoff with nature at about $30 million. All together, U.S. airlines lost well over $100 million, a pittance though when compared to the entire industry. The International Air Transport Association said the final number would be close to $2 billion, not a surprising amount when you consider that London Heathrow – the busiest airport in Europe – was shut down for a week. Imagine ORD, or LAX or JFK shut down … not slowed down, but completely shut down!
So again, no surprise that the airlines wanted action to remedy the situation quickly. It only took a few days before most CEOs began pointing fingers at the EU claiming they were being too conservative by shutting down most Northern European airspace. Problem is that there is very little research around on how much ash a turbine engine can stand before it shuts down. We know the worst case when a KLM 747 lost all four engines after flying in to the ash cloud from a Mt. Redoubt eruption. No injuries – at least physical – when the pilots got the motors humming again after a 13,000 foot fall.
There’s absolutely nothing worse for airline personnel to be grounded for reasons they can’t control, or even explain. That’s why Lufthansa sent out a specially equipped A 340 last week to test the ash. It returned unscathed prompting the question about whether it might not be OK for others to tempt fate.
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Do Pilots Still Use the E-6B Whiz Wheel?
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Recently I received a release from Sporty’s Pilot Shop about its new CD or downloadable training course, Virtual Tips & Tricks for the Manual E6B. Not a week or so later I read that Sporty’s will soon have its iPhone E-6B app ready for download, joining the large number of such apps already on the market.
What surprised me was not the app, but the Whiz Wheel program. Do student pilots still learn to use this amazing device, which was created just before World War II and never needs batteries? And do they continue to use it once they finish training? Does the mechanical slide-rule computer have a place in the futuristic world of computerized avionics giving all the fuel consumption and time-speed-and-distance answers as standard readouts?
Obviously, there must be enough demand for old-school methods for Sporty’s to create the new product. But I wonder, do pilots exercise some of its more esoteric capabilities? A reassuring visit to the National Intercollegiate Flying Association revealed that there is one group of pilots that still spin the E-6B to its limits, the students who compete in Computer Accuracy. Think you’re up to their challenge? Click the button to read the rest of this post.
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Rightsizing Aviation: Doing Less With More
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For the past week or so a number of us have been engaged in an ongoing discussion on flight training, inspired by Pro Pilot Training Evolving to Industry Needs, about the forthcoming end Danny Webster’s program.
This discussion has focused on training methods and evaluation, with a little bit of business thrown in for good measure. Looking at it with a wide angle lens, encompassing other aviation developments, such as the potential merger between United Airlines and US Airways, it is clear that aviation is rightsizing itself.
Aviation is a legacy industry in transition, moving from the analog era typified by radar-based ATC, to the NextGen world of performance-based navigation derived digitally from above. Shrinking consumer demand is exacerbating aviation’s evolution, so it is now doing less with more. This is a situation no industry can sustain, so not everyone will survive the transition.