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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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Pilot Journey: Turning Targeted Prospects Into Pilots With Emotional Statistics
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Every industry effort to increase the pilot population, from Learn-to-Fly and Be-A-Pilot to the upcoming International Learn to Fly Day, has the same weak link that keeps a program from reaching its full potential: the flight schools, and their instructors, that must make the sale.
Before condemning CFIs for letting the aviation industry down, consider this, says Gary Bradshaw, president of Pilot Journey (left, with Mary Ann Rymer, at its kiosk in the EAA AirVenture Oshkosh Learn-to-Fly Discovery Center), a flight instructor and former flight school owner: “Being a flight instructor is a career path they’ve chosen, either to be a professional CFI or to build experience to follow another pilot career path. They never said I want to be a marketing professional.
“When I was a flight instructor, I sucked at [marketing], too,” Bradshaw says without apology. “I could not do what I wanted to. I had to start a company that focused on this aviation niche because my time was split.” Pilot Journey started in 2001 “with me in a bedroom, and now there are 14 of us” who provide the outreach marketing needs of more than 400 flight schools.
Pilot Journey sells $129.95 Discovery Flights, which include a two CD-ROM prep kit, on its website and does all the follow-up marketing, which includes surveys to both the school and customer, at no cost to participating schools. “We make our money on the Discovery Flights, and schools get $90” to cover their operating costs, Bradshaw says. Prospects are Pilot Journey customers until they enroll in training.
Every aspect of the Pilot Journey program is based on statistics gathered through trial and error marketing. The Discovery Flight price point is a good example, Bradshaw says. Pilot Journey tried everything from $69 to $159. Follow-up email surveys showed that $100 separated one-time adventurers from serious prospects. At less than $100 one in 10 started training; at $129 it’s one in four, he says.
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Preventing Another Hudson Midair
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Although the people at Fox News have always been very nice to me when they call and ask for my technical expertise on aviation matters, I must admit I do sometimes dread their calls. That’s because their phone calls usually means something bad has happened, as it did when they rang me last weekend about 10 minutes after the helicopter and the the Piper PA-32 ran together over the Hudson River.
Nine people lost their lives. The amateur video of the crash made the point that pilots simply looking out the window to avoid other aircraft doesn’t always work.
No surprise too when plenty of people began pointing fingers of blame at, the helicopter pilot, the Cherokee pilot, the air traffic controllers at Teterboro Tower – who were yesterday suspended in fact – and this somewhat unregulated look to air traffic in the New York area. And let’s not forget that folks in the New York area are highly-sensitized to things flying over their heads, and with good reason too.
Perhaps it won’t be this accident alone that causes a change, but eventually more intense air traffic demands will force the industry’s hand. I also gave a radio interview about the future of collision avoidance to WRHU in New York on Tuesday. My friend Max Trescott and I were also talking last night how the accident could have been prevented and came to very much the same conclusion. A traffic avoidance system based upon transponders – transponders are already required in this airspace – might very well have prevented this tragedy. The business jets I fly – as well as all airliners – are required to carry such gear. Small aircraft are not, at least not yet.
The picture above (courtesy of Garmin) shows you the kind of screen I also see in the Cirrus SR-22 that comes equipped with a basic mode of traffic avoidance software. Of course, every aircraft is not a glass panel like this, but there are less complicated versions of traffic avoidance equipment available as a retrofit in all aircraft.
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AirVenture Update: Gemini Diesel Engine
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In aviation journalism one never knows with any certainty what topics will capture — and keep — the readers’ attention. During EAA AirVenture Oshkosh 2008 I wrote about Powerplant Development’s Gemini diesel engine (Gemini Diesel Engine Attracts Industry’s Eye), with an update in January 2009 (Gemini Engine Moving Toward Production). Because readers are still discussing the engine in the comment sections of these posts, here is where things stand at EAA AirVenture Oshkosh 2009.
First, JetWhiners aren’t the only one interested in the Gemini diesel. Every time I passed the Powerplant Development booth in Hangar C the crowd around the trim black and silver engine and company president Tim Archer was two or three deep. After a half-dozen or so passes on different days, I finally was able to get a minute or so with him.
Like just about every other aspect of life worldwide, the economy has slowed progress, but “we’ve finished the mapping of the fuel system,” said Archer. This was the key element needed to complete the programming of the engine control unit, which controls the fuel nozzle.
With this key component in place, “We should be receiving production units in the next three weeks.” Durability and endurance testing begins with their arrival, Archer said. A lot of that testing will take place in England and, given the current schedule, it should take about a year to complete. — Scott Spangler