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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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AirVenture and Paris: What a difference
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At the Paris Airshow and it’s counterpart in Farnborough England, the emphasis is clear … which company can announce more commercial airplane deals than another. That’s not bad by any means. But all aviation experiences are not created equal.
At the EAA’s AirVenture extravaganza in Oshkosh Wisconsin each year, tens of thousands of aviation enthusiasts (including Jetwhine’s editor) show up to watch and wonder, more often than buy.
We come to see new airplanes and products certainly, but also for an occasional glimpse of what’s to come. This year, Eclipse rolled out a new single-engine concept jet, Cirrus plans to build a Light Sport Aircraft (LSA) as does Cessna with their new 162. There was also considerable talk about green airplanes which have recently become an industry focus now that the pendulum has swung to belief in a changing environment.
It was also clear at Air Venture however, that some companies have been involved in “e for environment” efforts for sometime. One company, Sonex Aircraft based at Oshkosh’s Wittman Airport, in partnership with AeroConversions took center stage at AeroShell Square on July 24 to unveil a number of powerplant alternatives that may well set new industry standards. The Sonex research and development team produced the e-Flight Initiative to explore viable alternative energies for powering sport aircraft, all designed to keep aviation affordable. (more…)
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On the Record: An Interview with Former NATCA President John Carr
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When John Carr told me he had 3,000 election votes – more than anyone else – I thought he was kidding.
He was referring to the poll run by AvWeb asking for replacement recommendations for outgoing FAA administrator Marion Blakey (and yes, Blakey has confirmed she won’t spend one extra day at FAA when her term expires in September).
By the time the voting ended, Carr had garnered nearly 4,200 votes to win the title of administrator could-be, no chump change against the likes of challengers AOPA president Phil Boyer and former JetBlue CEO David Neeleman.
John Carr is no stranger to elections though having both won and lost as president of the National Air Traffic Controllers Association. Carr was replaced for the top NATCA slot by Patrick Forrey last fall after six years on the job.
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Cessna 162 Skycatcher Should Grab a Chunk of the Flight Training Market
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AirVenture is so much different than Paris. You can actually get close to the new machines in Oshkosh, which is just what I did this morning when Cessna officially unveiled the new Cessna 162 Skycatcher, the airplane giant’s new entry in the Light Sport Aircraft (LSA) category.
EAA president Tom Poberezny sat on stage today with Cessna CEO Jack Pelton during the ceremony. “People today have much higher expectations for training airplanes than they did years ago,” he told the audience. Cessna hopes the 162 will fill that hole that has been vacant in the training aircraft marketplace for many years.
Although copies of the new two-place Cessna won’t become available until the second half of 2009, orders are now being taken in Oshkosh. $5000 reserves a slot on the first 1,000 airframes.