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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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Is Silence a Symptom of Aviation Atrophy?
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With no demands or duties, I retired to the deck on Father’s Day to reflect on my life’s journey, to appreciate the good times and bad that are its waypoints. A caressing breeze ebbed and flowed from the west like wind waves on the sky’s shoreline as I stared absently at an unseen stylus scribing a chalky white arc of vapor across a cloudless blueboard at 35,000 feet.
The songbirds uninterrupted medley almost drowned out the muted road noise, civilization’s inescapable tinnitus. It wasn’t until the Cessna 182, which resides on Omro’s eastern limit at Skydive Adventure, buzzed determinedly skyward that I realized that of all the places I’ve lived, this small town of 3,000 is infrequently below flying machines of all types.
Your perspective will assess this odd or not, but it seems incongruous because Omro is roughly 10 miles west of Oshkosh’s Wittman Regional Airport, home of the world’s busiest control tower, and during that one week of EAA AirVenture, the sky over Omro is, indeed, alive with airplanes. But over the intervening 51 weeks, it’s pretty quiet.
I wonder, is this silence a symptom of aviation atrophy, an industry contracting through lack of use, time, money, interest, or all of the above? Or is it a fluke of location?
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Who Will Maintain Civilian Drones?
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Unless they are directly involved, either as a daily job or when something’s broken, maintenance isn’t a top-of-mind topic for most aviators. So it took me awhile to wonder who’s going to maintain and fix the burgeoning number of civilian unmanned aircraft systems, how will this demand affect those invested in flying the old fashioned way?
The drone fleet is a diverse lot, ranging in size equal to a Boeing 737 to smaller than a hobbyist’s RC flying model. According to the FAA, approximately 50 US companies, universities, and government agencies are developing and producing 155 designs. And it has issued roughly a hundred certificates of authorization that enable specific operators to fly in the National Airspace System.
Most drone news is devoted to the regs and requirements that safely separate them from populated aircraft. UAS operators start with AC 91-57, Model Aircraft Operating Standards. Maintenance requirements, who must what and when has been missing from this news. Rooting around the FAA website led me to UAS Interim Operational Approval Guidance that, if I may summarize, says inspection and maintenance requirements are similar to manned aircraft. Learning who was authorized to do this work was more elusive. The interim guidance said, “In the future, UAS Maintenance Technician certification will parallel existing standards for manned aviation.”
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Air France 447 Final Report Means an Ugly Summer Ahead
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I’ve been dreading this summer … for the first time in my life though actually. That’s because next month the final French BEA report on the Air France 447 crash will be released.
Most professional pilots have a pretty good idea what it’s going to say though … pilot error. No big surprise there.
From the headlines lately, the need for one media outlet to trump the BEA to their final report is powerful. London’s Daily Telegraph decided that not only were the AF 447 pilots at fault, but that Airbus has been hiding behind a sidestick design flaw for two decades since the A330 was certified. In another, a writer claims that the angle of attack indicator was faulty. Then ABC’s Nightline claimed last week that Captain Marc Dubois had a lady friend — an Air France flight attendant — along for the ride that night, someone who kept him quite distracted after he departed the cockpit for a rest break.
Technical issues on the A330’s pitot tubes? That’s fact already. Fresh pitots just hadn’t found their way onto this airframe before the accident unfortunately. Major sidestick design flaw though, after 20 years … I don’t believe it.
These airplane stories become easily jumbled up when non-aviation types get too close though. I’m trying to do my part and keep the story straight for some of the mainstream media when I can. Fox News gave me another opportunity last week when the PIC’s girlfriend story began circulating. Fox News and other networks about Air France 447. (more…)