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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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Privatized ATC May Solve Pilot Shortage
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This headline isn’t as strange as it sounds when you consider that the airlines are the leading promoters and supporters of privatizing air traffic control, and that the managers have often been at odds with the laborers (like pilots). Mix this with the travails of another “government corporation,” the U.S. Postal Service, and the growing capabilities of the Next Generation Air Transportation Systems digital data communications systems, and you have the makings for some dystopian devil’s advocacy.
Behind all of this is the acceptance that business leaders, regardless of the industry involved, are guided by one thing—the bottom line. Depending on their morals, they’ll do anything to increase that number. And one way to increase that number is to reduce or eliminate things that subtract from it. Take, for example, the “ticket tax” they pay, which supports the air traffic control system.
That tax is based on the base fare passengers pay for that ticket. It does not take into account all of the fees passengers pay for things that used to be wrapped up in the ticket price, things like baggage. Those fees go directly to the airlines’ bottom line. Privatizing ATC is the next step in this process. It will replace the ticket tax with ATC user fees, and we all know who pays an airline’s fees, don’t we?
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When Pilots Back Themselves Into a Corner
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When Pilots Back Themselves into a Corner
When I was still writing for AOPA Pilot, Turbine Edition Editor Tom Horne always surprised me with his relentless interest in some of the funny and strange things I’ve experienced in my career as a professional pilot. “Did I ever tell you about the time my co-pilot and I had to push our Citation out of the corner we’d wedged ourselves into?” I once asked. So of course I just had to write it up. This story, Taxi Troubles, originally ran in the Turbine section of the February 2017 AOPA Pilot.
A Long, Long Time Ago …
Flying on-demand Part 135 airplanes can be a tough life, with pilots often spending their day waiting for that firefighter-like call to swing into action—calls that always seem to happen near the end of the day. We fly in all kinds of weather, often into unfamiliar airports at a passenger’s whim, but this Uber-like service is why we exist.
I’d just walked in my back door under a beautiful starry sky, so all seemed right with the world when the pager went off around 11 p.m. The scheduler said Tommy and I were headed out in the company’s new Citation S/II—new to this company, at least. The trip would be easy: Depart the Waukegan, Illinois, airport; drop one passenger at an airport in central Michigan; and come home. A quick weather check said it would be as beautiful a VFR night in Michigan as it was in Chicago.
Since the trip over was my leg and I’d already checked weather, the only thing left was a look at our airport destination, where our passenger said his wife would be waiting in her car on the ramp. It was a single-runway, non-towered field, so it should be easy in and easy out. Climbing away from Chicagoland, we could already see the lights lining Lake Michigan’s eastern shore. In the descent, Tommy tried calling unicom, but since it was nearly 1 a.m., no one answered. The winds were calm, so I chose to land straight in on the nearly 5,000-foot Runway 9.
Tommy clicked the microphone a few times to make sure the runway lights stayed on, which we needed since there weren’t any other lights even remotely close to the airport. The touchdown was hard, characteristic for me in this airplane. The S/II had a different wing that the other Citation IIs we usually flew, and I just never seemed to get the hang of the darned thing. Next time, I guess, I thought as I turned south off the active runway.
After much grunting and shoving and heave-hoing, though, the darned thing started to move…slowly.
After much grunting and shoving and heave-hoing, though, the darned thing started to move…slowly.I left all the landing and taxi lights on and slowly came to a stop on the taxiway. This place was dark—really dark. No taxiway lights, just green reflectors sticking up on plastic poles to outline the way. “We’re taking it easy,” I said, with Tommy quickly nodding.
“There,” he said. “Aren’t those headlights?” Almost in response, the headlights flashed. I flashed the taxi lights in response, feeling confident now on where we were headed. There wasn’t much room to turn the aircraft, but I managed to get it pointed outward from the ramp before I shut down. Our passenger was eager to be gone and we were soon watching his car’s taillights disappearing down a dark road. I used our big Maglite for the walk-around as Tommy climbed into the left seat for the trip home.
With both engines spinning, Tommy taxied out. We’d decided to depart west, which meant simply reversing our taxi back in—which is, of course, what we thought we were doing. But with nothing except reflective tape on some sticks, the going was slow. I looked down at the approach plate to be sure I had the correct frequency dialed in to call the center after takeoff. When I looked up, I almost felt a bit of vertigo, since the path ahead looked different from what I was expecting. It looked like buildings appearing in the lights.
“What the heck is that?” I asked Tommy.
“We’re OK,” he said. “I remember seeing that coming in.” I think the quizzical look was still plastered on my face as the airplane stopped. “Uh, oh,” he said. Definitely buildings. We’d made a wrong turn somewhere and were now pointing down a narrow taxiway with T-hangars on our right. As we both looked at the buildings around us, Tommy did the smart thing by setting the brakes and shutting down. Climbing out with the Maglite again, we looked ahead and saw the dead end. The taxiway was maybe half again as wide as the Citation’s wide gear stance.
There was no clear way to turn the airplane around—at least, no way we could see where we wouldn’t fall off the edge of the taxiway. So much for getting into bed early, I thought. Of course, we also had no idea how we’d even call anyone for help at 1 a.m. We looked at each other as we circled the airplane again, flashing the Maglite in all directions—as if, by chance, it might point us toward the way out. No such luck. “Well,” Tommy said, “We could try a three-point turn.” I looked at him a bit quizzically.
“We start up, then I crank in a hard left turn with you outside. All you do is stop me before I go off the pavement. Then just before I shut down, I’ll cock the nosegear full right.”
“And then we do what, exactly?” I asked.
“We push it back until we’re almost off the pavement going backwards.” It was about 1:30 a.m. in Michigan, but this kind of made sense to me. A few minutes later, we tried the turn, me acting as ramp agent. When Tommy shut down and exited the airplane, we walked over to the back end to see how far we could push the jet and stay on the pavement. We figured about 10 feet, so I marked a spot by tossing my hat down under the belly, so we could both see it while we were pushing.
Even light on fuel and with no people aboard, pushing a Citation is nothing like shoving around a 172. After much grunting and shoving and heave-hoing, though, the darned thing started to move…slowly. We saw our mark and stopped pushing the jet. It stopped almost immediately. Tommy hoped back in, fired up the right engine, and repeated the three-point turn procedure. We almost made it out on the first try, but we had to shut down and push one more time.
Finally, as we taxied out, it became clear how we missed the turn. But I was more amazed at how we’d gotten out of this mess. For months after that, when Tommy and I would see each other in the crew room, one of us would ask, “Been to Michigan lately?” and laugh.
https://www.aopa.org/news-and-media/all-news/2017/february/pilot/turbine-taxi-troubles