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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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Good News: Georgia Airports Mean Business!
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This YouTube video is but one half of Georgia’s airport promotion.Seeking escape from pervasive bad-new morosity I quickly discovered some really good and uplifting aviation activity in Georgia, which recently launched a two-part promotion, Georgia Airports Mean Business. Along with this YouTube video, which the state also distributes on DVD, is the printed and online 2011 Georgia Statewide Airport Economic Impact Study, which covers the states 104 public-owned, public-use fields.
In 1992 the economic contributions of Georgia’s airports was $16.8 billion; it’s grown to $62.8 billion, with 471,100 jobs with a $17.8 billion annual payroll. But that’s not the really good news. That’s reserved for the impetus for the branded promotion effort.
“Those of us in aviation, whether we’re pilots or on the infrastructure side, we get it,” says Carol Comer, director of intermodal transportation (aviation, rail, and waterway) for the state department of transportation. “The harder sell is for the family in a rural area who may have never been on an airliner, much less general aviation airplane.”
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Safety May be the Death of General Aviation
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In her opening statement at the June 19 convocation addressing General Aviation Safety—Climbing to the Next Level, NTSB Chairman Deborah Hersman said “in spite of improvements to the commercial and corporate aviation safety records, the GA accident rate has been stubbornly resistant to safety initiatives.”
She’ll get no argument that, “the status quo is not acceptable. We need to break through the plateau and bring the accident rate down significantly.” But there will be change, no improvement, if the NTSB works to this mindset: “GA pilots are not learning from the deadly mistakes made by their brethren – not learning from lessons learned in the hardest of ways. Recreational fliers are the chief pilot of an airline of one.”
If the NTSB somehow encourages legislators and the FAA to impose airline and corporate aviation requirements on general aviation, it will surely be the coup de grace.
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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?