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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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Two Professional Pilots … Missing
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Two Turkish airline pilots have gone missing. The aircraft they flew to Beirut on August 9 is just fine, as is their cabin crew, but these two men simply vanished into thin air … and almost no one is talking about them.
Captain Murat Akpınar (L) and his first officer, Murat Ağca (Lower Right), were kidnapped August 9 from a crew bus as they left Beirut Rafic Hariri International Airport (OLBA), headed for their hotel. Syrian rebels claim to be holding them hostage for leverage in gaining the release of a number of Lebanese Shiites who were themselves kidnapped in Syria last year. The rebels believe the Turkish government can and should do more to pressure the Assad regime to release the Lebanese prisoners.
No small surprise that Twitter and Facebook posts don’t carry the weight in Lebanon that they do elsewhere in the world, but if these had been two British Airways, or KLM or Air France pilots grabbed in Beirut, people would be hovering outside the embassies demanding answers We’d be tweeting and Facebooking all over the place. Not in Lebanon apparently and not for a couple of Turkish pilots.
When I queried the Turkish Air Line Pilots Association for an AIN story, they told me, “The Lebanese and the Turkish ministers of foreign affairs are handling this issue. We are also closely monitoring developments on this subject with the Turkish press spokesman of foreign affairs. This is a delicate situation; therefore, for the safety of our colleagues we cannot provide any further information. We have been working with great precision and are making every effort to ensure our colleagues return to their homes in good health and rejoin their families and us.” A Lebanese court did issue an arrest warrant last week for 10 individuals suspected of involvement with the abduction, but no one has been caught to date.
Yesterday I asked the Turkish Airlines media people about the disappearance two and a half weeks ago. In a prepared statement, the airline’s Senior VP for media relations, Dr. Ali Genc would only say, “Please kindly be informed that this issue is followed up with the coordination of our relevant public authorities. We hope it will be resolved soon with good news. We are not able to make any further comments on that issue at this point.” In a couple of queries to the International Federation of Air Line Pilots (IFALPA) in Montreal, they too said they’d heard nothing.
Certainly no one wants to make a fragile situation worse for these two aviators, but at least when the Brazilians grabbed the two Legacy pilots in 2007, we knew they were alive. Not here though, except for a comment attributed to Lebanese Interior Minister Marwan Charbel that the pilots are in good health.
I’m left wondering … where’s the industry outrage and demand for information on these two … a photo, a recording, something? Perhaps readers elsewhere in the world can fill the rest of us in because no one seems to be talking.
What actions have the business aviation or airline community in the west taken to ensure the safety of other pilots headed to the region? I doubt carrying a weapon will sit very well with anyone. Security escorts perhaps? I realize the West is busy beating the tom-toms to take a whack at Mr. al-Assad, but is this kidnapping just the leading edge of a new wave of hostage taking with flight crews as bait? We can only hope not.
So stand by … and hope we see these two men soon … because right now, standing by seems to be all anyone is doing.
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Lindbergh’s Boyhood Adventures Led to Paris
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A solo trans-Atlantic flight to Paris is the signature event in the iconic life of Charles Lindbergh, but it was, perhaps, not the most challenging or arduous. A visit to his boyhood home on the bank of the Mississippi River in Little Falls, Minnesota, revealed that in 1916, a 14-year-old Lindbergh spent 40 days on the “road” from Minnesota to California in a Saxon Light Six with his mother, his uncle, and Wahgoosh, his fox terrier. The car, now restored, still resides in its garage at the Minnesota Historical Society site.
My visit came on the last leg of a 16-day, 5,400-mile motorcycle trip to Seattle and back, mostly on the US highway system, which was created in 1926, a year before Lindbergh’s flight to Paris. President Dwight Eisenhower signed the National System of Interstate and Defense Highway System into being in 1956, in part because he was one of 37 officers and 285 enlisted men who manned 81 Army vehicles in the First Transcontinental Motor Train that took three months to cover the distance between Washington, DC, and San Francisco in 1919.
In his Autobiography of Values, Lindbergh says little about the adventure. “There were rainy days in Missouri when mud collected on the Saxon’s wheels until we could not move. Frozen ruts in New Mexico slowed us down to a speed of less than ten miles an hour, as did Arizona sand.”
This was the era when paths that connected towns were marked with different color blazes painted on telegraph poles and fence posts. The prime transcontinental route was the Lincoln Highway, which stretched from New York City to San Francisco and was dedicated in 1913. I wonder, would parents today allow their 14-year-old to make Lindbergh’s trip?