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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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LSA Pilots Could Spoil a Good Thing
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Pilots are a contentious bunch, but if there’s one thing they agree on it is that flying is too expensive. Naturally, they blame the companies that sell them the stuff they want.
Affordability was a primary selling point of sport pilot/light-sport aircraft. Everyone trumpeted the coming of new fixed-wing flying machines for fewer than six figures. But Dan Johnson, who knows the light aircraft industry better than most, pointed out in his SPLOG that prices are on the rise.
What’s surprising, but shouldn’t be, is that the pilots who are buying LSAs are the ones ringing up the total price. As Dan says, the weak dollar and a strong Euro account for a good part of the increase but, hey, options like dual glass, a full capability GPS nav/comm, and an airframe parachute are not free.
If pilots want these goodies and they have the money, I say go for it. Get what you want. And they are. Most of the pilots buying these tricked-out LSAs are “retiring” from larger, heavier, all-purpose GA aircraft. My question is this: Why?
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For Aviators, GAO, FAA & DOT are Cut from the Same Cloth
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Last week’s report from the U.S. Department of Transportation’s Inspector General, at first glance at least, looks like another nail in the coffin for business aviation.
The DOT report – designed to show which aviation group actually uses how much of the nation’s airspace – claims to support the ongoing indictment by the Air Transport Association (ATA) that business aviation is clogging up the air traffic system. That should be pretty useful for the ATA since they’ve always accused business aviation of refusing to pay its fair share of the ATC system costs anyway. And somehow too, the airlines have tried to focus their passengers on this smoke and mirrors show.
But this DOT report also reminds me eerily of a discussion we had here just a few weeks ago about the General Accountability Office. Especially the part where you’ll learn that the DOT uses FAA data to support their conclusions, just as did the GAO. To speed your read here, I’ll remind everyone that the GAO faulted FAA for keeping lousy data. In a statement that should make everyone who reads this report sit up and take notice as the DOT admits, “We did not systematically audit or validate the data in any of the databases.” Nice to have data around to make major industry decisions, such as who will pay how much for ATC services, even if it is difficult to verify or simply flawed.
ATA certainly wasted no time developing a media release confirming the flawed government data that seemed to clearly feel vindicate their goal … to pay less than they pay now, much less.
Industry insiders might want to spend a little time reading through this DOT report because there are a few more things that don’t make sense either (no smart aleck comments … I know it’s the government).
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Aviation Jokes: A Breath of Fresh Air
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I’m sorry to wreck your weekend, but this joke – courtesy of the folks at AhaJokes.com – was so funny I simply had to share. John Carr at The Main Bang and I have been thinking of adding a bit of humor to some of the discussions we’ve been posting just, well, just because we need a little humor I guess. so here’s my shot across the bow John.
This one’s called Raccoons are not Luggage.
As migration approached, two elderly vultures doubted they could make the trip south, so they decided to go by airplane.
When they checked their baggage, the attendant noticed that they were carrying two dead raccoons.“Do you wish to check the raccoons through as luggage?” the service rep asked.
“No, thanks,” replied the vultures. “They’re carrion.”