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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 Flying Isn’t Like a Bus … It is a Bus
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Well, Spirit Airlines has finally gone and done it.
They’ve taken what used to be a really nice product – I flew them often between ORD and TPA until they dropped the service – and turned it into the
closest thing to a city bus possible by adding on-board advertising. Yes folks, now you too can stare at a Crest poster, or a Nike ad or even a splash for the latest Batman film for three hours, or longer if they can keep you locked up that long.
When I heard that Spirit was calling its new program Mile High Media I thought that too was a joke. If you don’t know what I’m talking about, take a look at the Mile High Club on Wikipedia.
I suppose no one should be surprised at this when other airlines are pulling every rabbit out of their hats to secure fresh revenue sources. Certainly Spirit is not the first airline to use their airplanes as billboards. A number of European carriers have been using it for years, except their adverts are on the outside of the airplane. Somehow, I guess we’ll all need to get used to adverts on the back of the seats, on window shades, overhead bins, tray tables and drink carts.
So have the Spirit folks lost their minds or have become truly savvy marketers? Perhaps this attempt at marketing integration will take customer’s minds off the lawsuit Spirit pilots filed against the company last week. Only you can decide.
The fact remains that Spirit has broken some new ground in airline marketing, even if I don’t particularly care for it. I give United a week before they take the bait. And seriously, how could any potential advertisers pass on this … “Where else can you find 100 percent saturation with a targeted captive audience that will be actively engaged by your ad for an average of three hours?”
Oh somebody save me. I wonder if Spirit will sell sleep shades on board too.
Technorati tags: air travel, pilots, mile high club, mile high media, Spirit Airlines, bus advertising, ALPA -
Proposed Policy Doesn’t Solve Homebuilt Problem
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If my homebuilding buddies are a typical sample of the amateur-built airplane community, there’s a lot of confusion about what led to the new policy the FAA has proposed. (See Homebuilt Aircraft: How Much is More than Half?)
My friends are solid, however, on the effect of the new policy: it will make do-it-yourself aviation more complicated and bureaucratic than it needs to be. The existing rule is clear and concise: you must build more than half the airplane for your own recreation an education. Paying someone to do it for you doesn’t count. (Would you pay someone to take your vacation?)
The proposal makes the same requirements buried in bureaucracy. One example: builders must “fabricate” a minimum percentage, and “assemble” another minimum, and the proposal doesn’t bother to give the accepted FAA definition of either term.
What’s really sad is that the proposal won’t solve the problem the FAA asked the aviation rulemaking committee to solve: How do we stop people from paying professional builders to fabricate and assembly high performance homebuilt aircraft that give better performance than their store-bought cousins for a fraction of the cost?
Herein lies the confusion. My buddies, most of the scratch builders, are blaming the new policy on airplanes like the Van’s RV-10 or turbine-powered Lancair Evolution. To paraphrase their misdirected words, “Inserting Tab A into Slot B is not homebuilding!”
Tuckered out from creating their whirlwind of invective, I got a word in and pointed out that the problem WAS NOT the airplanes. It was people who bought them, hired professionals to build them, then signed their name on the form that said they built 51 percent of the airplane for their own education and recreation.
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September 11th; The FAA Administrator Speaks
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This is the seventh anniversary of the terror attacks in New York, Pennsylvania and Washington that included the hijacking of four airliners eventually used as suicide bombs, the first time we all learned that sitting back and hoping for the best as passengers or crew was no longer an option.
Air travel everywhere on the globe would never again be the same.
We remember the 3000 plus people who perished in the towers, the Pentagon and in a small grassy field in Pennsylvania on 9/11, as well as the 4,100 plus U.S. service men and women who have died as a direct result of those attacks.
I invite you to take a minute and read a speech given by then FAA Administrator Jane Garvey just a few weeks after the attacks. I found it worth the time to look at what this lady had to say seven years ago, as well as the plans she outlined for the future of aviation.
Compare Garvey’s plans to what has been accomplished to improve our industry since she spoke. Then compare Garvey’s plans and those results with the vision of our current Administrator Bobby Sturgell.
It’s pretty clear the current agency is like a ship adrift without a captain, a problem that won’t be solved until January 20th at the earliest.
Technorati tags: FAA, Jane Garvey, Bobby Sturgell, September 11th 2001, New York, Washington and Pennsylvania attacks, pilots, air travel, natca