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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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Labor Day 2016: Strategies for Aviation
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Ed. Note: While this article was originally written back in 2008 and while many of the names of the top folks at the organizations have changed, the issues by and large have not. That said, I believe this is worth a few minutes of your time to think about the role of the labor movement in the U.S. We all know membership is down in 2016, but my real question is whether or not avoiding unions has created a better America. I’m not so sure. I’ve also reprised an earlier Labor Day podcast at the end of the story should you be curious for a little more to chew on. Happy Labor Day to all.
Rob Mark
Labor Day 2008: Strategies for Aviation
There’s nothing quite like Labor Day for a little reflection about the state of business in America.
This year, there’s plenty to give us a moment’s pause too, because short of auto manufacturing, I can’t think of another American industry that is as unionized as aviation. Even FAA employs tens of thousands of union members.
But first a disclaimer. As the son of a union worker and the grandson of the president of a major American labor organization, I grew up listening to labor management battle stories and tales of tactical intrigue, honestly, I read and write about labor because I’m interested.
I also learned in my career that support for a union can be expensive in many ways. Sometimes it translates into alienation at work like friends avoiding you. Sometimes, the action can be much more violent as my family learned long ago. Support for the meat cutters union in the 1920’s cost my grandfather his life.
Despite a bucketful of disagreements with many of the labor perspectives I see plastered around the Internet and in the media, and notwithstanding the fact that I have paid dues to more than a few unions in my time – ALPA, PATCO & NATCA – I still believe the need for unions has not deteriorated in the past few decades.
I think the need is even stronger.
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Oklahoma Small-town Promotes Aviation
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The last thing I expected to find on the historic route of US 66 at the edge of the small town of Weatherford, population 10,833 (according to the 2010 census), in western Oklahoma was not only a first-rate air and space museum, but one affiliated with the Smithsonian Air & Space Museum. But there it was. And who could miss the F-4 Phantom that is part of the General Thomas P. Stafford Air & Space Museum and Airport.
What’s really interesting about this 40,000-square-foot museum is that it is incorporated with the terminal of the Weatherford Airport (OJA), a city-owned nontower airport with a single 5,100-by-75-foot concrete runway. Guessing that the eponymous airport and museum were named for hometown boy who went to the moon with the Apollo program didn’t demand a degree in rocket science.
Stafford increased the population of Weatherford in 1930, but what was really interesting is that his mother arrived in the state in a covered wagon, most likely with Oklahoma Land Rush into the “Unassigned Lands” in 1889. She lived to see her only child fly into space on Gemini 6 and 9, and to the moon as commander of Apollo X. And I was surprised to learn that his command of the Apollo-Soyuz mission garnered him a nomination for the Nobel Peace Prize.
Named a Smithsonian Affiliate in 2011, the museum started as a simple display case in the Weatherford Airport Terminal. It now displays more than 3,500 artifacts, many of them having logged real time in the atmosphere and beyond it. A number of them are on loan from the Smithsonian, including the pressure suit Stafford wore on Apollo X. Another surprise is that exhibits cover the spectrum of aviation, from the replica Wright Flyer and Spirit of St. Louis to the expected aerospace artifacts such as an F-86, Mig-21, F-16, and a Titan II rocket, and an Apollo Command and Service Module.
Time spent examining the museum’s Smithsonian-quality exhibits is well worth the $7 admission ($5 for 55 & older, AAA members, and military, $2 for students 18 and younger; active duty military and children 5 and younger are free). It presents not only a concise and comprehensive look at aviation; it is an unspoken statement of Weatherford’s appreciation and support of it. In doing a bit more research when I returned home, I learned that the museum is a nonprofit organization owned and operated by the City of Weatherford, Oklahoma. Ever evolving, it is worth a visit just to see the unique display of its most recent addition, an F-104 Starfighter mounted in a zoom-climb outside the museum’s entrance, with its pointy nose aimed skyward. — Scott Spangler, Editor