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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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Bahamas Challenge Rewards Winter Escape
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When you live in Wisconsin, where this October day never really dawned under thick ominous clouds and the temperature is struggling to reach the 40s, an e-mail about flying to the Bahamas really gets a pilot’s attention. And by doing so, earning a chance to win 23 hotel nights at top resorts on various islands makes it that much more appealing.
The Bahamas Ministry of Tourism debuted its Pilot Challenge during the just concluded AOPA Aviation Summit in Palm Springs (ah, more warm and sunny skies). The goal is two-fold, said Neil Glazer, one of 11 Bahamas Flying Ambassadors in the US, and president of PilotMall.com, which is administering the challenge. The first is to attract new pilots to the island chain that starts about 60 miles from the Florida coast; if they’ve already made the flight, it’s cause to explore islands not already visited.
Pilots who document landings at 12 of the 20 Bahamas airports of entry before November 30, 2013 are eligible for one of four hotel-night prizes. Winners will be selected at random and announced in December 2013. Registering at www.bahamaspilotchallenge.com gets pilots the official challenge passport that customs officials must validate at qualifying airports. (It’s also where you’ll find FAQs, rules, and other info.)
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The FAA and its Centers of Excellence
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Those with a proclivity for cynicism might judge this headline an oxymoron equal to military intelligence. But before you snigger and stop reading, consider this: under its Center of Excellence banner, the FAA has selected a team of universities with renowned aviation programs to conduct general aviation research and test things that will enhance its safety, accessibility, and sustainability into the future.
No idle, unpaid for political promise, the FAA will invest at least $500,000 a year for the first half of the COE’s 10-year run. And this is not the only—or inaugural—COE. The FAA established the first GA Center of Excellence in 2001. During its decade run its participating universities researched and tested pilot training, human factors, ADS-B, remote airport lighting, and other facets of GA. And the FAA has established other COEs dedicated to other aspects of aerospace endeavors.
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If I Were an American Airlines Pilot
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There’s no small amount of irony in the fact that American Airlines axed the contracts of their pilots just a few hours past Labor Day last month. Kind of adds insult to injury. I feel for the pilots having been around to watch the ugliness of Midway 1’s disintegration after failed Chapter 11 attempt in 1991. On the other hand, as the owner of a small business, I’ve also been an American Advantage customer for decades. It’s a tough spot actually.
After the past few weeks of maintenance write up, pilots calling in sick and generally bad airline publicity, I was thinking about the point the pilots might be trying to make to the management people at DFW.
Certainly they were fed up with being asked to absorb more cuts. They were also saying there really still is a line in the sand, despite what the management people and customers on the outside might think. I don’t think this is going to be Eastern Airlines all over again where employees shut the company down for good, but I do think management everywhere might just have called the death of organized labor a bit early. There’s life in them yet … and that’s not all bad either. (more…)