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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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United Pilots Give Tilton a Kick
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To most people, owning a web site address with their name is something to truly covet. What better way to tell the world through a good blog what we think about everything that’s wrong or right with the world.
But what happens when someone else grabs the web site with your name on it first and uses it to give you a good swift kick in the rear?
The best person to ask that question of today might be United Airlines CEO Glenn Tilton. The pilots at his airline today unveiled their new anti-CEO web site at Glenn Tilton.com.
They want Tilton out, claiming he’s everything that’s wrong with the airline. Once a significant industry player, United has been rebuffed twice this year when it attempted to begin merger talks with Continental and US Airways.
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John Carr Speaks to Drug Screening
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The post John Carr put up yesterday about the U.S. DOT’s proposed new guidelines for administering drug tests to some aviation employees would be absolutely hilarious if it wasn’t so sick. John posted comments from the general counsel for the PASS employees – airways systems technicians – that outline the new drug testing rules.
If you’re returning to duty, or have tested positive in the past for whatever reason, employees will now be expected to offer a urine sample while the supervisor watches in order to guarantee authenticity. And did I tell you that all will be expected to remove their underclothes and bend over to prove they’re not hiding anything?
But it’s not really all that bad because, “After this is done, they may return their clothing to its proper position and contribute a specimen in such manner that the observer can see the urine exiting directly from the individual into the collection container, as required under current regulations.” (more…)
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One Air Traffic Controller’s Perspective on Morale
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Fresh on the heels of Sunday’s post about the flavor of labor relations that led PATCO controllers to call a strike against the FAA in 1981, I added a question I asked acting FAA administrator Bobby Sturgell about employee morale during the “Ask the Administrator” session at AirVenture last week.
Now comes a letter from a Jetwhine reader who is right in the thick of things, in this case at the Albany Airport tower (ALB) in upstate New York.
My question to Bobby Sturgell focused primarily on whether he realized the damage that bad morale was inflicting on the national airspace system itself, as well as the thousands of people who work for the agency.
I came away that afternoon, as did many others in the room, believing that the answer was either that Sturgell didn’t realize the price the current state of employee morale was taking at FAA, or that he didn’t care.