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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 Surprises & Snowbird Respect
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As it seemed last year, the U.S. Navy’s Blue Angels low-level fly-by at EAA AirVenture Oshkosh this year seemed to catch many people by surprise. I don’t mean to shatter your illusions, but nothing at AirVenture happens as a surprise, especially when it involves airplanes. Every flight is carefully planned and coordinated with the AirVenture Air Boss and ATC. And every morning at Press Headquarters, the legendary EAA communication director, Dick Knapinski, spoils the day’s surprises in detail.
On Thursday morning, he told the handful of us in attendance (given the goodies he shares, I’m surprised more members of the media don’t attend) that the U.S. Air Force Thunderbirds would, at the start of the air show, make four low-passes during their fly-by appearance as they, like the Blue Angels, traveled from one scheduled performance to the next. But the next item is what caught my attention. Around 2 p.m., a Canadian Forces Snowbird would be arriving in his CT-114 Tutor. And rather than performing, “he’ll be camping in the Vintage area,” Dick said, qualifying his camping spot by noting that his jet was made in 1964.
Certainly, the military forces of different nations can’t be that different. Flying a squadron bird from the Snowbird home base in Moose Jaw, Saskatchewan, Canada, on a camping trip to EAA AirVenture Oshkosh would be akin to me using one of the ship’s small boats to go fishing when I was aboard the USS Blue Ridge (LCC-19) in the mid-1970s. My curiosity put a ring through my nose and led me to Vintage to wait.
Right about 2 p.m., the red and white Tutor made a couple of low passes, landed, and taxied to vintage camping. A tug arrived to position it on a finger of pavement next to the grass that would be the pilot’s campsite. The aviator in the red flight suit, with Blake McNaughton embroidered on it, was obviously in command. A captain in the Canadian Forces, he’s the Snowbirds’ flight safety officer. (I didn’t get the name of his squadron mate, who was attired in standard-issue green Nomex.)
Before I could ask the obvious question, the Thunderbirds made their appearance, and McNaughton was clearly more interested in filling out the necessary aircraft paperwork and putting his Tutor safely to bed after the tug driver jockeyed it into position. “Oh, yeah, we camp just like everyone else at Oshkosh.” And when the entire Snowbirds team performed at AirVenture in 2016, a couple of us tent camped.”
But a solo camping trip? “Our chain of command understands that Oshkosh is a cultural icon. [Camping] is what you do when you come here. We don’t take ourselves too seriously; we have a good time. We set up tents and camp. It’s great! We want the full, rich Oshkosh experience.” (With no room in the jet, they made separate travel arrangement for their tents and camping gear.)
Perhaps there are differences in the military attitudes among the national forces. On reflection, a solo camping trip to AirVenture is some genius guerilla PR, a subtle statement that supports the demonstration squadron’s ambassadorial mission. But McNaughton demonstrated an even more forceful example of the character and quality of the Canadian Armed Forces. Kneeling on the wing, digging the wheel chocks out of little compartment behind the cockpit, when he heard the first few notes of America’s national anthem, he sprang to attention. (His squadron mate, clearly sat at attention.) He stood there, in rigid contrast, as the flight line mass of U.S. flagpole patriots fluttered about in self-absorbed oblivion. — Scott Spangler, Editor
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August 3, 1981 – PATCO Strike Remembered 38 Years Later
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Ed note: It was 38 years ago today that the U.S. aviation system was turned upside down out. What have we learned in those decades since? Many controllers today are again working 10-hour days six days a week.
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I remember the morning of August 3, 1981, vividly as I turned on the TV to find news stories of air traffic controller members of the Professional Air Traffic Controllers Organization-PATCO-marching with picket signs at the base of the tower at Chicago O’Hare and other airports all over the nation. They’d simply run out of patience with their employer the FAA and took matters into their own hands.
Many of the people I saw on TV were friends. Most lost their jobs later that week when they refused President Reagan’s ultimatum, “Return to work or you will be fired.” Few ever returned to air traffic control again, in fact.
There’s little point today in talking about how the strike could have or should have been handled. PATCO stuck its neck out and lost. It’s done, it’s over.
What is interesting about our nation’s air traffic control system today nearly three decades later is how little the agency that runs the system – the FAA – seems to have learned from their own mistakes of that era.