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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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No-Pilot Aircraft Go Vertical & Hover
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At a fundamental level I understand the technology that makes no-pilot, remotely controlled aircraft work. And it seems to work well in fixed-wing aircraft that fly high in the controlled airspace (see UAV Pilot Shortage & Military Intelligence and UND Plants Seeds of No-Pilot Airliners ). But down in the dirt and among the trees with the rotorheads, who must have 360-degree free-gimbal vision and hands and feet that play different instruments but must make precise music? No way.
Way. A billion bucks way. That’s what United Technologies is putting in Sikorsky Innovations, the effort to create a no-pilot H-60 Black Hawk and other projects to make helos fly faster, simulate vision, and monitor their own performance. The Houston Chronicle headline of the AP story was clear: Sikorsky Helicopter Will Need No Pilot.
Kaman Aerospace and Lockheed-Martin beat them to it, according to an AP article in the Washington Post a week later: "Lockheed, Kaman Unmanned Helicopter Test a Success.” Fulfilling a Marine contract, the heavy-lift K-Max demonstrated programmed and remote-control flight, hovered at 12,000 feet, and delivered 3,000 pounds of cargo within the time limit.
For an encore demonstration, with its four-hook carousel the unmanned K-MAX lifted loads with a combined weight of 3,450 pounds. On the single flight it delivered three of the four sling loads to preprogrammed delivery coordinates. A ground operator controlled the final delivery.
Each demo mimicked the confined area challenges of Afghanistan. If technology can safely meet this challenge, say what you want, but it seems clear that the cockpit of the not too distant future will be a cubicle in some office building.
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The Polar Keyhole??
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A Global Express pilot friend of mine in Seattle, Val Trent – also an NBAA member – asked me a few weeks ago if I’d like to read something he’d written about the Polar Keyhole. At first, I thought maybe he’d started writing fiction and this was going to be the first installment. I was wrong.
This fascinating piece on the Polar Keyhole will expand the minds of pilots who have never flown way up north as it details some of the peculiarities of the basic magnetic compass we all fly with coupled up with the Flight Management Systems (FMS) found in most turbine-powered aircraft. Val Trent is a former Army helicopter pilot with some 19,000 hours in his logbook and currently flies a Global Express. The only continent Val’s missed is Antarctica and he says that’s just fine with him.
Please welcome Val Trent to Jetwhine.
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Diversions: Mach None Flying
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One of the greatest joys I found in flying was diverting to some intended destination, usually to hide out from the weather. These stops were not an inconvenience to my schedule, they were an opportunity for adventure, to explore someplace I’d never been before, which is why I was happy to land at MachNoneFlying.com, “the online newspaper of low, slow, affordable and fun flying.”
I landed here because powered paragliders fascinate me. A PPG? It’s the fabric wing you wear like a parachute that’s powered by the meat grinder on your back. Yeah, I want to fly one, so I’ve been wandering around this afternoon looking for someplace to learn how, once it gets warmer.
In the PPG section it has a number of embedded videos that took my breath away. In one a Canadian mounted a camera in his canopy, and when he took off from the frozen lake, the snow looked like clouds and reminded me of those shots you see of the Space Shuttle orbiting Earth.
One PPG from Brett Paull on Vimeo.
The second appears to be in a warmer clime and season, humming across agricultural lands and coastlines. Ah, now this is flying. No airports, no hangars or tie downs, no ATC, and no traffic. Keep the rig in the truck; freedom as close as humans can approximate to the birds. The ultimate antidote for thaasophobia. Now, if you’ll excuse me, I need to resume my research. There has to be a PPG school somewhere close. — Scott Spangler