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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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Without Planes, Small Airport is a Museum
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Working my way around Lake Michigan last week, I passed a small airport in Northport. This village of 526 people is at ring-fingertip of lower Michigan’s left-handed mitten. The fieldstone terminal with a conical roof in bumble-bee colors on its open-air observation area was worth a closer look.
Nothing outside identified the airport or whom to call for assistance, but the payphone worked! The doors were locked. Window peeking, the building was empty, except for a few bicycles, a gas grill under a tarp, and a hand-painted sign leaning against a wall: Woolsey Memorial Airport.
Ready for a stroll after hours of sitting behind the wheel, I paced off the 2,600-foot north-south and 3,600-foot east west runways that meet at the windsock. Lights with clean, clear lenses poked out of yellow cones. Rocks with a recent coat of yellow paint spelled out the airport’s name. The grass was neatly trimmed and rolled smoother than my backyard.
As I walked toward three hangars at the west end of the runway, an eerie feeling that something wasn’t right grew stronger. Looking closely, it dawned on me that there were no signs of aeronautical life at this pristine little airport, no bald patches of grass at the runway approaches, no wheel ruts leading from the hangars. It was like being alone in a museum diorama showing what used to be.
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Good Next Step: Advancing Pilot Community
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Certainly more details about its new Center to Advance the Pilot Community will be broadcast during October’s AOPA Aviation Summit in Palm Springs, but that doesn’t satisfy my need to know now. Ah, curiosity is an impatient task master, so I sat down with my buddy Google.
Having worked with him during my tenure at EAA, Adam Smith is an excellent choice to lead the new program. Attuned to pilots of every interest, he’s passionate and knowledgeable about not only aviation, but ferreting out the tangible and intangible things that lift their wings.
But the announcements of Adam’s appointment didn’t tell me a lot about how the new entity was going to Advance the Pilot Community. That I found further down Google’s list, in the position description of the now expired help wanted ad. By adding new initiatives to those already in place, the center stands a better chance of success than any previous effort I can think of thanks to its multifaceted approach.
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Bragging Rights & The Future of Flight
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Here in Wisconsin, a swing state, we have been incessantly pummeled by political ads of both parties. This onslaught has been painfully punctuated almost daily by political surveys whose questions do little more than support the delusions of the person who paid for it. Add two weeks of intellectual drown proofing in the tsunami of lies and half-truths taken out of context that emanated from the thankfully ended conventions, and it’s hard to have a good mental outlook about anything, let alone aviation.
Try as I might, I could not escape the tentacles of cynical aviation apathy, the feeling that there was no place in aviation for people like me. This metaphysical predator ambushed me in, of all places, the travel section of the New York Times. The headline says it all: Space Tourism is Here! Wealthy Adventurers Wanted.
Reading about all the ways rich people can get into space was interesting. Yes, there’s some training involved, but in the article it seemed secondary to wining and dining with their economic peers at something akin to an aerospace spa. In the end, what matters more than acquiring a skill is the bragging rights, which is what they are really paying for.
What pulled me under was the realization that, for the most part, rich people don’t invest the time and effort needed to truly accomplish something hard, like climbing Mount Everest or flying a plane. They hire someone to take them there by the hand or in the back seat. This confirmed a dark notion that’s been lurking in my subconscious, unless we revive the middle class and restore the economic vigor it exercised three or four decades ago, general aviation as we’ve known it is doomed.