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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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Geekdoms Collide Saturday at Udvar-Hazy
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This Saturday morning at 10 AM EST, the earth will move … or stop I guess, whichever is cooler I guess. For me, it means the first time that I’m going to visit the Udvar-Hazy Center of the Smithsonian at Washington Dulles Airport.
I’ve been meaning to visit for years and what’s better than choosing the weekend they’ll be running their annual Become a Pilot Day and aviation display. As a lifelong aviation educator, there’s nothing I like more than talking about airplanes or trying to convince people that they’re as hypnotic as I’ve found them all my life.
But as enamored as I’m sure I’ll be when I arrive in DC tomorrow, nothing will quite compare with the fact that on Saturday morning at 10 AM, the guys from my alter-ego radio show, The Airplane Geeks, will be producing our show live near the Junkers and across the aisle from the Enola Gay. If you’ve listened to the show, you know how much fun we have. What goes on behind the scenes though is even a bigger hoot though I must tell you.
What makes this a particularly ground-shaking moment for all of us, is that the show on Saturday at the Udvar-Hazy Center will be the first time that all of the geeks have ever met in person, as well as producing a live show as well. Good Grief!
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Corporate Terror BARR None
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The Department of Transportation’s recent notice that it will dismantle most the Block Aircraft Registration Request (BARR) program, which hides corporate aircraft activity from online flight-tracking programs, has caused quite a stir.
Aviation’s alphabet organizations have risen up against the transparency initiatives the feds have used to justify the change. Trusted voices in the aviation grapevine suggest that DOT Secretary Ray LaHood had his own reasons for voting yes on the dropping the curtain. NBAA administers BARR for its 3,000 members, and it says removing the veil of privacy from corporate operations “gives anyone in the world — terrorist, criminal, tabloid stalker, business competitor — the equivalent of an Internet homing device to track the movements of citizens and companies in real time.”
Perhaps, but I don’t buy it. One source does not make or break a plot to get someone. Flight trackers show where an airplane is going, not who’s on it. The skeptic in me thinks something else more sinister is behind it all. First, remember the seemingly endless negative PR storm that followed when CEOs seeking a government handout arrived in their expensive corporate carriages. Then think about the ardor with which corporate America fights any manner of regulation.
Okay, with memory refreshed, ask yourself this question: What scares our corporate aristocracy more than any terrorist, criminal, tabloid stalker, or business competitor? How about close scrutiny of their activities by, in increasing levels of terror, the public, the government, and—gasp!—their shareholders.
BARR hides corporate flight activity, but not deep enough to keep it safe from a Freedom of Information Act request. That’s how the Wall Street Journal got its hands on the “records of every private aircraft flight recorded in the FAA’s air-traffic management system for the four years form 2007 to 2010.” The headline of their research and analysis of this data says it all: For the Highest Fliers, New Scrutiny.
The reporters summarized their findings this way: “Those with access to private jets fly around the globe on a whim, steering clear of security lines and never being charged extra for baggage.”
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Vertical Flight: Two Ends of the Spectrum
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After seeing its inaugural (public) flight at EAA AirVenture 2008, I’ve been following the the development of the Martin Jetpack. Beyond the sci fi coolness of the Kiwi project, a few questions came to mind, like what happens when the engine fails? With ducted fans instead of rotors, it can’t autorotate, so how far can it fall before the pilot ceases to function?
The Martin Aircraft Company started to answer those question on May 21, when a remotely piloted Jetpack, manned by a weighted dummy, George Jetson, climbed almost vertically to 5,000 feet and took off cross-country, a helicopter following it. Then they fired a BRS Aerospace ballistic parachute, which slowed gravity’s inexorable come-to-mama embrace to 15.7 mph.
As the landing seems quite survivable, the website says the Jetpack is designed to protect the pilot in a free fall from 30 feet. The structure, from the Kevlar hoops around the fan nacelles to the arms that hold the control sticks in place, acts as an energy absorbing roll cage.
That leaves one last question: What about the no-fly zone, altitudes above free-fall survival and below the minimum altitude needed for the ballistic chute to open and slow one’s return to Mother Earth? There’s no answer yet, but testing is underway. And the goal is to negate the no-fly zone.
Another historic day in the annals of vertical flight took place shortly before the Jetpacks impressive climb—and safe return from—5,000 feet above sea level. On the dyslexic date of May 12, students at the A. James Clark School of Engineering in Maryland made the first flight of a human powered helicopter.
As you can see, it only lasted a few seconds and gained a few inches of altitude. Like its human-powered predecessors, the Gamera (Japanese for a giant flying turtle) is constructed of balsa, carbon fiber, foam, and Mylar. With four 42-foot rotors separated by 60-foot cross bars, it weighs 100 pounds.
The pilot, Judy Wexler, a University of Maryland grad student, sits in a module under the arms’ intersection. Like the pilot of powered helicopters, all her appendages were busy. Instead of controlling the cyclic, collective, and anti-torque pedals, they were peddling.
The flight achieves what is, perhaps, aviation’s last “first flight,” and the NAA is now verifying the records. But this is but the first step toward the American Helicopter Society’s $250,000 Sikorsky Prize, established in 1980 for the first controlled flight—of at least one minute—of a human-powered helicopter. Now that I can’t wait to see. — Scott Spangler