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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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North Dakota Aviation: Front Door to Growth
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Lately there hasn’t been much good news about aviation, general or otherwise. Then I went to North Dakota for a story on a one-tech avionics shop halfway between Fargo and Bismarck. A flight school was setting up in the next hangar, an indicator of better times at the airport, said Greg Earnest at Jamestown Avionics, because new pilots mean more airplanes. In passing, he mentioned the state’s Flight Training Assistance Program, which defrays the cost of bringing a CFI to airports where none live.
Say what?
Greg aimed me at the North Dakota Aeronautics Commission. Its website was as open, friendly, helpful, and positive as the people I’d so far met in Jamestown. “The state aviation system is an attractive front door to our state’s economic growth,” reads the first sentence of the commission’s philosophy. Here’s the rest of it: “To ensure this growth, the system needs continual enhancement with state-of-the-art technology. With this goal, continued flexibility and responsiveness by the Aeronautics Commission will fulfill the needs of the aviation community.”
Which brings us back to the flight training program. Keeping track of FAA pilot statistics, the commission decided to do something about the declining pilot population in the state—down 22 percent, from 4,095 to 3,207 over the past 30 years. Its analysis revealed a disproportional decline between rural and urban areas, in part attributed to the dearth of CFIs at rural areas. North Dakota law says that the commission shall cooperate with towns to develop and coordinate aviation activities, this includes educational grants, i.e. the Flight Training Assistance Program.
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Anniversaries: The Good, the Bad and the Great
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Sometime next month, a few anniversaries begin jumping out at me. And no, my 20th wedding anniversary doesn’t pop up til next spring, but I’m told I can still choose
between China and Platinum trinkets with my Happy Meals.
I was actually thinking more of a few aviation-related milestones as I penned this, both the events and the people those events brought me together with.
October 27, 2011 will be Jetwhine’s 5th anniversary.
It just about coincides with a date five years ago when a Gol Boeing 737 and an Embraer Legacy ran together in the skies over the Brazilian rainforest. The stories that followed the tragedy filled countless posts here in our first six months as many writers and pilots tried to make sense of the accident. Five years later, no one is really sure what happened for certain, except that the Boeing crashed and the Legacy managed an emergency landing at a Brazilian air Force base. The pilots were found guilty in absentia by a Brazilian court and the Brazilian air traffic controllers were also found to be at fault.
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Airlines Not Only Ones Addicted to Autopilot
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September started with an AP story that revealed the cost of airline cockpit automation, atrophied stick and rudder skills. As one might expect, there’s been a lot of comment on both sides of the argument. Some GA types have been, without justification, overconfidently smug.
GA pilots can become addicted to cockpit automation just as easily as their airline peers. What makes this worse is that unlike airline pilots, who must fly according to thick and specific operations manuals, GA pilots consciously chose to become addicted. And they’ve been doing that ever since glass-controlled started taking up residence in GA cockpits.
Back when I was flying for publication, airframe manufacturers were like street corner pushers, “Hey there, magazine writer guy, want some stick time?” Call me old school, but in my vocabulary “stick time” means I’m holding the stick (or yoke) and actually flying the airplane. About 15 years ago the definition changed: “stick time” was a takeoff and landing separated by a lot of button pushing and knob twisting.
On my last flight for publication, I was looking forward to getting hands-on with a tumultuous Midwestern wind. Having been a while since my last flight, I was looking forward to realigning the seat of my pants to such things as crab angles and smoothing out the bumps.
When I didn’t automatically engage the autopilot after takeoff, the demo pilot (a CFI, like most are) looked at me in amazement, like I was some sort of alien being. But he said nothing. For about 10 minutes, until he couldn’t stand it any more. Then, with my PR minder in the back seat, over the intercom he shamed me into giving up command to technology.