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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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A Million Reports, Accidents & Demographics
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On April 24, the e-mail edition of Callback arrived in my in box. It proudly announced that the NASA Aviation Safety Reporting System had processed its one millionth safety incident report on March 21, 2012. Three days later I received the NTSB release addressing 2011’s preliminary stats, No Fatalities On U.S. Airlines or Commuters, General Aviation Accidents Increased.
Safety is the only direct relationship between the coincidental announcements.
After reading the 2011 stats, there appeared to be no significant reason for alarms. The increases were small, just 50 more accidents for all of civil aviation, with total fatalities up just 12, and on-demand Part 135 ops and GA were responsible for the the bulk of them. Given the small numbers, they are the margin of error that nothing will eliminate.
Digging into the ASRS numbers, and who made the reports, proved far more interesting. NASA started counting them in April 1976, and reached 1 million a month short of 36 years later. Using simple math, that’s 27,778 a year, 2,315 a month, 579 a week, or 83 a day. This ASRS chart above shows how quickly pilots got on board with the program. But that’s not the surprise. It’s who made the reports, and the demographic changes in their numbers over three decades of pilot population shrinkage.
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The Best and the Worst In-Flight Movies
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I’ve been a movie geek since I was a kid. So how could I refuse Zac’s Colbert’s (relation to Stephen Colbert??) request to pontificate about which movies are his favorites during airline travel? I wonder if my friend Mary Kirby at the Airline Passenger Experience Association agrees?
Rob Mark, publisher
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As a movie lover who also enjoys traveling, in-flight entertainment is a regular and important feature of my life. As a result, I’ve been the consumer of some fantastic and atrocious choices of film when flying.
Best
Airplane!
This is one of the funniest and most critically successful spoof films of all time, holding a 98% rating on movie aggregate site Rotten Tomatoes. The combination of deadpan acting, witty one liners and ludicrous sight gags is over 30 years old, but survived the test of time. It’s been imitated but never matched and is surely one of the best movies to help your flight go quickly … “But don’t call me Shirley.”
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What’s Aviation’s Future in a Polarized World?
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At the World Aviation Training Symposium, held last week in Orlando, Boeing’s chief test & evaluation pilot for new airplane development, Mike Carriker, said the industry must modernize its educational methods and technology if it hopes to prepare pilots and technicians to “maximize the capabilities of today’s high technology airplanes.”
While aircraft and teaching technology have “evolved exponentially” over the past half century, aviation training has not progressed beyond the rote regurgitation of knowledge and skills that satisfy disassociated evaluation tasks. Few will disagree with his assessment that the industry must now employ modern methods and technology in competency-based training not only to make the global transportation efficient and economical, but “to reestablish the aviation industry as an attractive career option.”
Given our entrenched political, economic, and social polarization, there is little or no chance that the industry will make this needed transition. It matters little that, according to Boeing’s annual Pilot & Technician Outlook, that we must educate a million new pilots and technicians in the next 20 years. In the zero-sum game that is modern life, ideological preeminence is more than the common good.