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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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Airline Labor: Tougher Tactics to Come?
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I have the good fortune to be one of the aviation resources some media folks call upon to translate complex aviation babble into language even my 14-year old daughter can understand. We don’t have too many good-news stories in the airline industry these days and certainly never any that connect large airplanes and water in the same sentence. Yesterday the planets aligned for just a few minutes though as the crew of US Airways Flight 1549 succeeded at the near impossible task of a dead-stick landing in an Airbus A 320 into the Hudson River. All aboard survived with only a few injuries.
Much of my time yesterday and today has been spent with the folks at CNN Headline News, Fox TV News, NBC and the Fox Radio network explaining the intricacies of flying to their listeners and there have been dozens of great questions generated. Much of the time when I wasn’t on camera or on hold, I was able to listen in as the producers and the on-air talent worked their magic coordinating resources to turn in a smooth as silk media product.
During one of the calls yesterday, a flight attendant called the CNN folks and I listened closely. A few moments earlier another cabin crewmember had explained the annual training flight attendants are required to complete so I expected something along those lines.
Rather than mention anything about flying, this lady read what was obviously a prepared statement in which she took airline CEO’s to task for accepting huge salaries in the face of staggering industry loses and tens of thousands of layoffs. Referencing the US Airways’ crash, she made it clear that rank-and-file workers were the people out there putting their lives on the line, not the CEOs. They deserve to be fairly treated the lady said and workers had had enough. Then she hung up. What a contrast to the brilliant piloting and cabin organization skills we’d just been talking about, I thought.
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Gemini Engine Moving Toward Production
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Designing, testing, certifying, and producing a new aircraft engine is never an easy process. A sour economy that sends investors into hiding just makes the process that more challenging. But the three-cylinder, six piston diesel/Jet A Gemini 100 (see Gemini Diesel Engine Attracts Industry’s Eye) is gaining on that goal, says Tim Archer, president of Powerplant Development USA.
Being developed in Britain, the company just received the UK equivalent of a small business loan that will put the Gemini 100 into limited production in April 2009. The first engines will be going to Tecnam, which will use its Eaglet to evaluate both the 100 and, at a later date, the turbocharged Gemini 125. “I don’t think we’ll make Sun ‘n Fun,” Archer says, but the Gemini Tecnam should be ready for AERO Friedrichshafen 2009, Europe’s leading GA trade show, and EAA AirVenture Oshkosh.
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Landing Light
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After just digging out from under 10 inches of lake effect snow in Chicago, I walked in to find these great shots from a Jetwhine reader. Thanks Alan J.
They reminded me of a time when an instructor once encouraged me to try landing a Cessna 150 so softly that we would not even know we’d touched down. It’s much tougher than it looks. But in a T-6? I mean, you have to be kidding me, right?
Are you guys at Gauntlet Warbirds watching this?
Can you imagine being the insurance agent on these airplanes and having someone e-mail this to your office one bright Monday morning?
The text that came with them reads just this way … “Early morning anglers are treated to the spectacle of four T-6 ‘HARVARDS’ (to the Brits) or ‘TEXANS’ (to the U.S.) Aircraft (former WWII Flight Trainers) from The Flying Lions Aerobatic Team water-skiing across the Klipdrift Dam near Johannesburg, South Africa.
Arnie Meneghelli from Academy Brushware, owner of the aircraft, had this to say, ‘What we did today I believe is a world first. It illustrates that South African air show pilots are amongst the best in the world.’ This unusual act, approved by the South African Civil Aviation Authority (CAA), and supported by Castrol Aviation, was meticulously planned and took place under the watchful eye of divers and paramedics that were on site.
Technorati tags: jetwhine, T-6, South African air show pilots, Harvards, Texans, air travel, pilots, Cessna 150.flight training, gauntlet warbirds