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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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Imagine if Airline Flying Was Fun
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I was on my way back to Chicago Midway from Dallas on Southwest Airlines Flight 1078 the other day when, about five minutes before boarding time, I heard the announcement no one wants to hear. A delay due to a mechanical, an issue the gate agent acknowledged was an inconvenience to everyone.
Looking around at the people sitting on the floor and standing against the wall in the boarding area, no one seemed that concerned. Honestly, I found that rather surprising.
But what took place over the next half hour gave me some real insights into this airline’s customer service techniques and why they so often translate into people who want to fly aboard the Dallas-based carrier.
Being an experienced Road Warrior – actually, I hate that phrase come to think of it – I started walking down the hall right after the announcement to the next gate where a later Southwest flight was scheduled to leave. I told the agent my story and asked her to put my name on the standby list to get a jump on the 150 other people that I knew were about to show up.
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Low CFI Birthrate & Graying Population Adding to Teacher Shortage
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Demographers will quickly tell you that a low birthrate combined with an aging population is not the key to a sustainable future for any population. Welcome to the situation that describes the American airmen who hold a current flight instructor certificate.
Birthrate and age are important in flight training because most of the CFIs who teach day in and day out are new and young. There are exceptions, of course, but how many 40-year-old CFIs to you see teaching every day at airports across America?
The CFI birthrate is measured by initial issuance of their teaching certificate. According to FAA data that starts with 1990, the numbers are trending in the same direction as the overall pilot population–down.
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Cars, Airlines and the Cirrus SR-22
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The Cirrus Design folks were in Chicago the other night on the first stop of a 22 city nationwide-tour
promoting not only the G-3 version of their top selling airplane, but also a special new version of Garmin’s popular G-1000 avionics system called the Perspective as standard equipment on the aircraft.
What made last week’s event of particular note is that people were able to peer into the cockpit of the SR-22 while it sat inside the Garmin retail store located on Chicago’s Magnificent Mile. The Cirrus folks trucked it down from Duluth, pulled off the wings and made it look to passersby like the airplane belonged on Michigan Avenue.
The irony of the event however, was that it took place on the same day General Motors announced massive layoffs in an attempt to cut the production cost of new cars. Not to be outdone, United Airlines also said it would cut another 1,000 workers including pilots and flight attendants to try and keep the airline from sliding any further toward the bring of extinction.