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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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America in Space: An Ambivalent Future
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Having grown up with the US space program (which celebrated the golden anniversary of Alan Shepard’s fight on May 5, 2011) and come of age when Apollo 11 touched the moon, I’m not sure how I feel about the final flight of Atlantis, which is writing the final chapter on the shuttle program and US spaceflight history.
In many ways it is like the final saddle-stitched (stapled) issue of Playboy. That was September 1985, and Madonna was on the cover. It appeared after Discovery launched several communications satellites in August on its next to last flight, and before the October flight of Atlantis, on the program’s second classified mission for the Department of Defense.
At the time I was ambivalent about the magazine’s change of bindery because not enough time had passed to see, understand, absorb, and appreciate its portent of coming changes in publishing technology, all of them driven by computers and their ability to communicate without paper. My feelings about the final shuttle flight are similar, but with a clearer focus on what the future likely holds.
Succinctly, human space flight for exploration is over. Like aviation before it, spaceflight is a victim of its own success. It is now a business all about the bottom line. We are a half century past Teflon and Tang technology trickle-downs. Return on investment is what matters. Sending humans to do technology’s job increases the cost exponentially. Tomorrow’s space travelers will buy a ticket on Virgin Galactic, the Russians, or one of the nascent companies vying for the International Space Station cargo contract.
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Technology Behind the Panic Button
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When I penned an article about the Panic Button the Rockwell Collins folks announced at Paris a few weeks ago, I was upset … not with the Rockwell folks, but with the plummeting airmanship skills that the development of a device designed to save a big airplane if the pilots lost control seemed to imply. My angst was tied to the AF 447 crash over the South Atlantic and the Colgan accident in Buffalo.
I had to admit,
of course, that if I were in the back of the airplane, I wouldn’t be worrying much about what a potential accident might say about the skill level of the aviators. My guess is I’d be a bit more focused on saving my tail, as well as everyone else’s.
The Rockwell Collins folks seemed to understand the pilot proficiency quandary in my head when they followed up the day the story ran. After a brief chat about how the system worked, I realized there was more behind the development of a device I found somewhat repulsive as an aviator, yet a godsend as a passenger.
First came a real definition of what many have been calling the panic button. Adam Evanschwartz, Rockwell Collins principal marketing manager for commercial systems in beautiful, downtown Cedar Rapids, said it’s really called the Autonomous Backup Capability (ABC — my acronym actually) and it’s built into existing flight deck avionics systems like Rockwell Collins ProLine Fusion. If the crew can’t control the aircraft for some reason, such as what happened to the Colgan crew, the ABC system could right the aircraft.
“Humans are tasked with using their brains to stay ahead of the airplane above and beyond what is demanded of other vehicle operators,” Evanschwartz said. “And sometimes, crews simply lose situational awareness.” He added an important element to the discussion when he explained that, “There is a trend in aviation toward smaller crew numbers on the flight deck. We expect that single pilot aircraft will become more familiar at some point, such as more business aircraft owners flying their own aircraft.”
Raising the Bar on Safety
Despite how it might appear, Rockwell Collins was working on this system long before Air France 447 crashed in the summer of 2009. The company acquired similar technology initially used to right unmanned drones when Athena Technologies was folded into the Rockwell Collins manufacturer (see video below).
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Safety Management System: NTSB Most Wanted is Big Investment With Little Return
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The NTSB just published its top-10 Most Wanted improvements to transportation. Beware of Number Three, Safety Management Systems, aka SMS. For newcomers, here’s the FAA definition: “SMS is the formal, top-down business approach to managing safety risk, which includes a systemic approach to managing safety, including the necessary organizational structures, accountabilities, policies and procedures.”
Canada started requiring SMS for all modes of transportation in 1998. Aviation’s turn came in 2005. Approved maintenance organizations (AMOs, what we call repair stations) that serve commercial operators were up first. In talking to two them, I learned two things: setting up an SMS is expensive, and it is all about the paperwork.
In ballpark numbers, it cost an Alberta AMO an estimated $500,000 to set up the system, and its annual operating expenses run into six figures. An Ontario AMO estimates its cost at $75,000, but this does not include billable time lost to analyzing, planning, putting the system in place, or training the staff to use it.
The kicker, says the Alberta AMO, is that the benefits of a safety management system are not yet quantifiable. “Accident and incidents have always been extremely low, making a statistical analysis of trends unreliable. Longer term or industry-wide trending may be required to show benefits.” Until that time, he said, what stands out are the liabilities, the system expense and administrative burden. And its coming soon to US airports and aircraft operators.