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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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The new FAA: Will we?
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It’s another frosty night in Chicago, but I stayed at work late to write because the issue of who will become the next FAA Administrator is really gnawing at me. Like the November election, this administrator choice is going to be an important one because it’s high time we called the agency what it truly is, or at least has been for most of the past two years … functionally locked in a dysfunctional holding pattern. Despite thousands of hard-working people – yes, even a few are my friends – and a rich history, my guess is Bobby Sturgell’s pseudo-administrator role will make history as one of the least-effective in 50 years … 52 speeches in 2008 and plenty of promises, but few other tangible results.
In all fairness, Bobby doesn’t deserve all the heat for being stuck between a rock and a hard place. The ultimate responsibility rests squarely with the White House. In addition to FAA, President Bush left dozens of other federal agencies similarly leaderless. The new FAA administrator will have his or her work cut out for them. Realistically though, we should be worried because with the state of the economy, transportation and aviation specifically, may not rank as high on the list as we’d like.
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Finding Good News at OSH
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Reveling in good news is how I always try to start the new year, but finding it in aviation has been a challenge in the relentless headwind of layoffs, furloughs, shutdowns, and bankruptcy filings. But I did find some, in my own backyard, at OSH, better known as Wittman Regional Airport in Oshkosh, Wisconsin.
Across the field from the EAA AirVenture grounds, on the eastern perimeter, is Basler Turbo Conversions. For nearly a decade I’ve driven buy it, and in passing it recently, it struck me that I know nothing more about it than it has converted the DC-3 into the Pratt & Whitney-Canada PT-6-powered BT-67 since 1990.
Basler actually remanufactures the airframes, says company president Tom Weigt. Most BT-67s start life as a DC-3/C-47 that’s flown an average of 15,000 hours. After gutting and steam cleaning the airframe, Basler repairs and replaces skeletal parts, resetting the accumulated fatigue damage clock to zero, extends the fuselage 40 inches forward of the wing, and installs all new Part-25 electric and hydraulic systems.
It takes the company’s 73 craftsmen 20,000 to 25,000 hours to remanufacture a DC-3 into a BT-67. On average, they complete two or three a year, Weigt says, depending on the options ordered, and the orders on hand will keep them busy for several years, which is good news for the company–and those who need an enduring workhorse.
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Amazing new Aviation Manufacturing System Revealed
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Rob Mark
So here we are, nearly ready to turn off the lights on 2008 in order to be prepared to bring them up on 2009 and all of it happening as economies all over the world unravel. The aviation manufacturing industry has not been immune to the highs and lows of the market. Just ask Boeing, Cirrus, Cessna, Eclipse and a few more. Most all have sent workers home on temporary or permanent leave. And now comes word from a former industry contact Bob Dourlain who has been lucky enough to uncover a successful new technique that could well bring any or all of these companies back into the black.
The secret to building more efficiently is so simple that most people will be unable to conceal their glee at the discovery. The answer, as Boeing here has discovered … work faster.
Technorati tags: Jetwhine, Eclipse Aviation Critic, Cirrus Design Company, Boeing, aircraft manufacturing, air travel, aviation marketing, nmedia.com