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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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Single-Pilot Point of Failure
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Given the capable reliability of aviation technology today, in the realm of a perfect world, single-pilots flying people-carrying commercial and military aircraft seems a logical hypothetical possibility.
To prove the reality of this possibility, the US Air Force flew two single-pilot test flights in its new KC-46 Pegasus tanker, which is based on the Boeing 767. After extensively practicing single-pilot procedures in simulators, a single-pilot, accompanied by a safety pilot in case something unexpected went awry, flew a refueling mission that made no connection with thirsty airplanes. With the success of this test, the Air Force flew a second full refueling mission profile with a single-pilot and single boom operator, again with additional hands-off safety personnel on board.
The success of these test flights last October generated several conversations about taking single-pilot airline operations a step or two beyond hypothetical. Flying in a perfect world, halving the typical cockpit crew would help alleviate the pilot shortage and improve the airline’s bottom lines. Oddly enough, it was this manner of thinking that led to the Air Force single-pilot Pegasus flights.
Given the goal of armed combat, to kill the enemy before they kill you, the Air Force may find itself in a situation where it has more tankers than it has pilots to fly them. This seems unlikely. While the Air Force is dealing with its own pilot shortage, certainly they have enough aviators to fully crew the 59 KC-46s it has so far taken delivery of. Still, in the realm of hypothetical scenarios, it is possible, and in combat, fulfilling the mission takes precedent.
What the stories telling about the tests did not address is the not inconsequential variable of the single-pilot point of failure. Yes, the boom operator would be filling the copilot’s seat when not topping off thirsty airplanes, but flying the refueling boom and the airplane it is attached to is not the same thing. If the single-pilot fails, for whatever reason, no matter how many souls are on board, their destiny is pretty much guaranteed.
Just ask the crews of the four-engine Lancaster bombers the Royal Air Force launched during World War II. You can meet and learn from them in a fabulous 2022 documentary, Lancaster: Above and Beyond, now on Amazon Prime. Most aviation history geeks know that the Lancaster was—and is—a single-pilot aircraft. In talking about their wartime training, the surviving gunners, bomb aimers, signals (radio) operators, navigators, and flight engineers said that choosing their pilot was not an inconsequential decision. And they did indeed choose, because after training everyone gathered in a room and figured out who would fly with whom.
Being a single-pilot point of failure is an equally important consideration in airline operations. Imagine the outcome had the incapacitated captain of that Southwest flight in March been a single pilot. Assuming one is onboard, having a passenger pilot would have offered no assistance unless he or she unlocked the cockpit door before losing consciousness. Their destiny would be the same as the boomer on a single-pilot Pegasus or the crew of a Lancaster. When considering a single-pilot point of failure, the only situation where it is justified is when there is only room for one in the cockpit. — Scott Spangler, Editor
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Learning From the Decisions of Others
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Aviation safety, when you get right down to it, is an endless round of risk assessment what ifs. There is much to learn when what ifs become real life right now. If you survive, that is. Another way to learn is from the decisions made by others. Call it aviation erudition, extensive knowledge acquired from books or other written materials, such as Callback, the monthly publication from NASA’s Aviation Safety Reporting System.
This fine and free publication is must reading for any safety conscious pilot, and the issues I most look forward to, because they keep my head in the risk assessment arena, are those like April 2023, whose headline poses this question: What Would You Have Done? Because no pilot can make (let alone survive) every manner of aeronautical mistake in every category and class of flying machine, Page 1 of this issue presents the essential facts from the spectrum of ASRS Safety reports, and then poses the headline question. Page 2 presents The Rest of the Story.
This issue presented three situations.
Dominoes in The Pattern set up a potential midair between a CFI doing pattern work with a student with an inbound flight aiming for the same runway and another plane departing on a crossing runway at a nontowered airfield.
Unmarked in Plain Sight recounts the situation where a UAS operator and commercial pilot who was training a new pilot for infrastructure inspections realized, after switching drones and taking off, that he’d forgotten to affix the FAA registration sticker to the airframe. The scenarios that introduce unfamiliar situations are risk assessment gold because they challenge you to logically distill the fundamental wort of your aviation knowledge.
The final scenario, The Wind in the Windows, presents a situation many general aviation pilots have faced, but when was the last time you heard a Boeing 767 captain writing about a cockpit window popping open at 110 knots on the takeoff roll. Not having a clue, I immediately scrolled the page for the rest of the story. Not wanting to spoil the lesson, you can read them all at the link above. Enjoy, and happy flying safely. — Scott Spangler, Editor