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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.
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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AirVenture Reflections: Contraction, Consolidation, and Concentration
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“What’s the coolest thing you’ve seen at AirVenture this year?” For the past 15 or 20 years, this is the question I dread because I never have an answer for my interlocutors. Don’t get me wrong, I find many things interesting at AirVenture every year, but it’s been some time since I’ve seen something that’s sub-zero awesome.
What’s most interesting to me are the changes that come with time. AirVenture is the showcase for all aspects of aviation. It is the international stage on which industry and consumer alike must appear to be considered among the the aviation faithful (and hopeful). The scope and diversity of their participation is, for me, a good measure of aviation’s vitality.
Light-sport aircraft (LSAs) celebrated their first decade of existence at AirVenture 2014. Since their introduction 134 different makes and models have been introduced at Oshkosh. In their early years they lined both sides of the diagonal road that connected the main gate to the forums area.
Not this year. But that’s not a bad thing because the LSA manufacturers that have survived now exhibit with all the other airframe OEMs in the outdoor exhibit areas. Tecnam was across from the new TBM 900. Flight Design greeted people at the main gate, with the Beech and Cessna airplanes (and the lonely Bell 407 helicopter) of Textron Aviation on the other side of Main St. AirVenture.
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Can This Reduce the Number of GA Accidents?
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RSS FeedIf you receive Jetwhine via e-mail, click here to listen to the program.
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I was working on a couple of a stories related to the Malaysian Airlines tragedy over the weekend when an idea popped into my head. The Nall Report AOPA publishes each year tells us the GA accident rate isn’t improving much these days, but thankfully is not getting any worse either.
I wondered if there were other parts of the industry we GA folk might be able to model to create a system that might actually reduce the number of GA accidents. The airlines and their FOQA program came to mind. That stands for Flight Operational Quality Assurance.
FOQA is all about capturing operation data and digging deeply to understand the stories that information tells us.
Before you go data privacy on me though, give this episode of The Aviation Minute a listen and tell me what you think.
Rob Mark, Publisher
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MH17 Flight Recorders and Evidence
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RSS FeedThe trouble with an aircraft accident that happens on the other side of the world for we Americans, especially one that occurs in a battle zone, is understanding which source speaks the truth about what’s happening on the ground.
Right now the MH17 crash is one of those kind of accidents. The Ukrainians say the Russians and the separatists were behind shooting down the Boeing 777 while the Russians either point the finger at the Ukraine government or simply refuse to answer at all.
For us over here, reports vary from “people are wandering all over the MH17 accident site and have already given the black boxes to the Russians,” to the alternative I heard this morning, “the site is completely intact and nothing valuable has been removed.” So who do we believe? Our only official source in the U.S. is the White House press secretary of the State Department and they say the site’s been compromised.
While I do agree that the first 24-48 hours worth of accident information almost always seems to be tainted with rumor more than anything else, it does make it pretty tough to relate the story without a journalist or government source we can trust to tell us what they see on the ground.
That said, I thought you might find this Saturday evening interview from Fox News about the potential implications of the data recorders and evidence being removed from the MH17 site of interest. It runs about 5 minutes.
Rob Mark, Publisher
If you receive Jetwhine by e-mail, click here to listen in.