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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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Follow a DayJet
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If you click on this link, you’ll find yourself sitting smack dab in front of a FlightAware screen all tuned up to Day Jet’s online identity. This gives you the tools to follow all DayJet trips in near real time.
Personally, I hope these guys just knock the socks off the critics of this new segment, as well as those who can’t seem to beat up enough the Eclipse 500s DayJet is using.
Sure DayJet is an unknown startup using an untested software system coupled to an unproven aircraft like the Eclipse, but boy if this works it is going to be one humdinger of an airline.
And then there are the Pogos and the Linear Airs and the North American Jets all using, or planning to use, the Eclipse.
Are they all crazy? Maybe.
As Boeing learned recently when they announced the tardy arrival of the 787 to the test track, or the two-year late arrival of the A-380 or the struggling Sino Swearingen SJ-30, building airplanes is not easy.
But this is how an industry pushes the envelope.
Go get em guys!
Technorati tags: DayJet, North American Jet Charter, Pogo, Linear Air, Eclipse Aviation, Sino Swearingen SJ-30, Boeing, airlines, business aviation
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An Airline Strike at the Beginning
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I wrote something here a few months back about the Air Line Pilots Association’s (ALPA) plan to start squeezing tighter on airline management as payback for the concessions pilots have delivered and how many airlines have failed to now remember from whose pocket that money came.
A friend of mine sent me a video yesterday that will give you the closest thing I’ve ever seen to a look at a little rank-and-file planning for a strike. This fellow flies for the old DHL, now called ASTAR, an all-cargo carrier based in Wilmington Ohio.
If you’ve never before seen the beginnings of a strike, I’d say bookmark this link. It might be your first, but most likely not the last if you hang around this industry for the next five years or so.
I’ve marched in a line with a bunch of other pilots in uniforms. To me, this entire video bears an eery resemblance to a funeral.
There’s more information available at AstarLaborTalks.com
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Aviation User Fees; Defeating Them is Still in Your Hands
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Those Aviation Alliance Across America folks are at it again.
They seem to think that industry types will take time out of their valuable day just to pick up the phone and punch in 866-908-5898 and be automatically connected to their members of Congress. I did and spoke to the folks in the office of Senators Dick Durbin and Barrack Obama and Representative Jan Shakowsky. That’s when I told their staffers that this week’s vote on aviation industry funding is crucial.
But those crazy Aviation Alliance folks honestly think people in the industry care enough to tell their members of Congress that they support the rebuilding of the nation’s air traffic control system and that they want to pay for it the same way we all pay for everything else in the system … through good old fuel taxes, a process that has kept the Aviation Trust Fund in the black for decades. (more…)