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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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California Bob and Air Traffic Control
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It really is becoming an annoying fact of my life that whenever someone mentions TV, radio and air traffic control, my friend Bob Richards seems to be in the middle. The guy is just everywhere!
Bob is the author of a book – Secrets from the Tower – that we’ve talked about before here at Jetwhine. It’s based on his experiences as a controller at Chicago’s O’Hare tower.
Despite the fact that we worked together as controllers 25 years ago – we used to call him California Bob then – he has managed to comfortably assume this rock-star persona. Here’s one more dog-gone example of his ease in front of the camera explaining air traffic control and the nation’s airspace system to MSNBC’s Lester Holt. This is the perfect link to share with friends who may not understand much about how the system works. Bob did a really great job here.
Now if I could just get him to help promote my books when he’s on TV!
And here’s a trivia question for you smarty pants out there.
Lester Holt has a brother who used to fly for a major airline. Can you tell me what airline? We’ll figure out the prize later.
Technorati tags: Bob Richards, Lester Holt, Secrets from the Tower, FAA Public Affairs, ATC, air traffic contol, MSNBC, California Bob, Jetwhine -
U.S. Air Force Tanker Selection is Driving Me Crazy
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Once the Pentagon chose the Airbus A330 over the Boeing 767 to begin replacing over 500 aging Boeing KC-135 tankers, it was a sure bet that sparks would fly. And they did, within hours of the selection.
The Boeing folks of course are really upset at losing a $35 billion contract. Yes, that billion with a “B.” But then some might say Boeing never deserved to win in the first place since the A330 is technologically superior to the Boeing. The first 767 rolled off the assembly line almost 30 years ago. The A330 series took to the air in the early 1990s. For the Boeing folks, losing the tanker contract also means the days of the 767 assembly line and its jobs are very short indeed, just a few years in fact.
Of course, there are those in Washington that realize John McCain’s hand in the discussions, especially since he led the fight against Boeing the first time the competition began a few years back. A number of senior Boeing officials ended up in the slammer amidst corruption charges that eventually halted the entire tanker competition process. Some say Boeing never stood a chance once the Republican presidential nominee and hand picked successor to George Bush got behind Airbus.
Then too, there is the national security concern of handing over the production of strategic Air Force vehicles to a bunch of those Europeans. This is enough to make people as nervous – if not more so – than Cessna’s choice of a Chinese company to assemble the Skycatcher. I know I won’t be able to sleep. Of course I can’t sleep anyway worrying about making the next mortgage payment anyway, but no matter.
Of course, the Airbus folks are not in this project alone. They were smart enough to link up with a U.S. company to help them land the deal, in this case Northrop/Grumman, a group that needed a good defense deal probably more than Boeing if it was to have any future position in the industry.
OK, wait. Now I think I have this straight.
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Flight Instructors: What’s in Short Supply is a Reason to Teach
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When the airlines start hiring, it doesn’t take long for flight schools large and small to start wailing about the shortage of certificated flight instructors. As FAA airmen certificate data proves, this is utter nonsense.
More pilots hold current flight instructor certificates today than any year in the past decade. And here’s something to think about: As the number of active airmen has declined, the number of CFIs has increased.
In 1997 there were 616,342 pilots, and 78,102 of them, 12 percent, also held a teaching certificate. In 2006, the most current data, there were 597,109 pilots and 91,343 CFIs. So, a 3 percent decline in the pilot population resulted in a 17 percent increase in the number of current flight instructors.
Over the same period, the number of student pilot certificates started at 96,101, peaked at 97,736 in 1998, slid to 84,866 in 2006. This begs the question: Can there be a shortage when CFIs outnumber students?
Obviously, we have more than enough qualified teachers. But few, nobody really knows the number, teach for a living.
Nearly 600 teachers of flight have earned a Master Instructor designation from the the National Association of Flight Instructors (NAFI). Working with the semi-educated guesstimate that one in 10 active instructors earns this designation, there are roughly 6,000 active CFIs. That means the other 85,000 CFIs are keeping their hard-earned tickets current. I’m guessing again, but in today’s world the only thing that would get them back in a flying classroom every day would be a furlough or layoff.
The question is why?