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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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The Aviation Minute Continues: Episodes Four & Five
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RSS FeedIt’s time to get our listeners caught up on The Aviation Minute.
Seems that working the kinks out of our new podcast turned out to be a bit more time consuming than I’d at first thought. Now that the iTunes folks tell us The Aviation Minute has been added to to the approved list of shows, it seemed like just the right moment to bring people up to speed on episodes four and five. From this week forward, you can also expect a new episode of The Aviation Minute each and every Thursday.
Episode four speaks to women in aviation and why the percentage of ladies in this industry remains so dismally tiny, while episode five offers a few parting thoughts to outgoing NTSB Chairman Deb Hersman and her respected team of investigative personnel.
Subscribing to the Aviation Minute
Because a show’s value increases with the number of listeners, I wanted to be sure you knew the easy ways to follow us. Certainly people using smart phones might find following The Aviation Minute easier through iTunes, but there is another system word mentioning … RSS. Despite the meaning — Really Simple Syndication — my first attempts at hooking up through RSS were a dismal failure. It took me awhile to learn that you need a reader of some sort to act as the aggregator for your feeds … so much for the simple part … no one mentioned that.
Google’s Feedly app has become my aggregator of choice, so much so that I’ve turned it into my default browser page. Now when I log on each morning, I can tell at a glance which of my favorite sites have created fresh content without the need to remember to continually check back at a dozens locations
So enjoy episodes four and five of The Aviation Minute … and of course be sure and tell your friends if you think the content’s worth 90 seconds of their time every week.
Thanks,
Rob Mark, Publisher
PS — Is there an issue in the aviation world that’s driving you crazy? Tell us about it and maybe we’ll use it for an upcoming episode. E-mail me directly at rob@jetwhine.com. And don’t forget to tell us the country you’re listening in from.
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Aviation Safety & Unrealistic Expectations
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Has the exemplary aviation safety record become its own worst enemy because it instills unrealistic expectations of risk in the minds of those fly? As a consequence, reactions to these infrequent but unpreventable circumstances instantly climbs to a level above and beyond hyperbole.
We all know that complacency in pilots can lead to unfortunate outcomes. But what about passengers? Do the years that often separate fatal airline and business aviation accidents build a sense of risk complacency in their minds? Do they think “It can’t happen to me.”?
And what about passengers in general aviation airplanes flown for fun and/or personal business? Do they harbor delusions of risk-free flight? Do they consciously acknowledge the risk they assume when they fasten their seat belts, like those who must read the mandatory passenger warning in amateur-built experimental aircraft: This aircraft is amateur built and does not comply with the federal safety regulations for standard aircraft.
Some might say that a realistic understanding of the risks involved with flying would be bad for business. This might be true for the media, which reaps the financial rewards of higher ratings by force feeding questionable “news” to an audience that can’t turn away (or turn off) the spectacle. But if the automobile industry is any clue, a more realistic grasp on the risks involved wouldn’t hurt aviation.
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Malaysian Flight 370: A Great Show of Smoke And Mirrors
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James Bond creator Ian Fleming Ian Flemming and Tom Clancy, both master writers of suspense and political intrigue — and their alter egos James Bond and Jack Ryan respectively — are probably looking down from heaven in awe at the story created in Malaysia to cover up the disappearance of MH370.
Jack Ryan’s creator Tom Clancy Just as the tragedy of 9/11 redefined aviation security worldwide more than a decade ago, the March 8 Hijacking of MH Flight 370, in addition to creating one of the greatest smoke and mirror shows ever, is certain to redefine airline security yet again … whether or not we ever find the missing Boeing 777.
An overwhelming lack of hard evidence hasn’t slowed the 24/7 media machine and most anyone with a radio, TV or computer from trying to figure it all out though. But while the search for the airplane goes on, we can’t forget this is not simply an academic exercise. The fate of more than 230 people is still unknown. Nor can we ignore the planning of some people and the incompetence of others on the ground in Malaysia that made this crime possible. (more…)