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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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Aviation User Fees: It’s About More than Money
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With less than a year to go before long-running Aviation Trust Fund legislation expires, FAA administrator Marion Blakey has been developing some serious rhetoric about the need to fix a funding system no one else except the airlines seems to think is broken.
The White House believes that billions of fresh tax dollars are the only solution to an air traffic control system currently stretched as operationally taunt as a bow string.
Not surprisingly, aviation alphabet groups, except for the Air Transport Association of course, have accurately identified holes in many of the specifics of the funding plan Blakey unveiled a few weeks back, as well as questioned the somewhat fishy timing that seems to line up with the airline’s serious need to stop the flow of their own red ink. (more…)
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Airlines Have Always Had More Service Solutions Than Customers Realize
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Airline passengers painfully canned in a jet parked just a few feet from freedom have been a part of the airline business for years. But the airline industry’s current house of cards involving JetBlue and American Airlines evolved initially from huge load factors – the percentage of seats filled on any given flight – that have climbed beyond the comfort level even for the airlines, as well as fewer equipment and people backups. This all translates into severely reduced flexibility operationally and lots of finger crossing hoping that nothing else, like the weather, turns sour.
The massive black eyes JetBlue received this week for its abominable treatment of customers detailed by The Chicago Tribune won’t be the last you’ll read about this sort of thing. Indeed, it was just a few months ago that American Airlines experienced similar route chaos.
Even prior to the JetBlue fiasco and that airline’s apology online and in dozens of national newspapers however, there were calls for a Passenger
Bill of Rights, a document to outline what airlines could or should do in case its managers again forget that customers might actually not enjoy a day in airline jail.
But the airlines already have a few tricks at their disposal that could well have prevented, or at least lessened the pain for travelers on Valentine’s Day. The airlines are also praying passengers don’t even think about them. (more…)
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Air Traffic Control Around the Globe: Shouldn’t Everyone be in on the Secret?
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Northwestern University’s Kellogg School of Management and the Northwestern University’s Transportation Center hosted Dan Garton last week to talk about how American Airlines’ has managed to succeed without the need for bankruptcy protection like its United, Delta and Northwest Airlines competitors.
Garton, American’s executive vice president of marketing, explained the company’s strategy to deal with an ever-aging fleet of MD-80s in the face of Boeing and Airbus order books packed to the teeth with plenty of demand from other carriers. American signed an exclusivity agreement that guarantees them airplanes when they’re ready.
Pretty smart idea.
The talk’s Q & A session was open to anything related to American Airlines, so I asked Garton how safe he considered the air traffic control system in Brazil for AA operations since the mid-air collision last September. I also wondered if the unraveling of Brazilian airspace problems had eroded any of American’s bookings to Rio for Carnival because of passenger concerns about safety. (more…)