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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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Historic Airplanes: A Reliquary for the Spirit and Soul of Their Crews
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The men who united as a crew in the vertical war over Europe after Pearl Harbor have all since surrendered, as we all must one day, to time. Its last living member, radio operator Robert Hanson, passed into history in 2005 at age 85. But their spirits and souls live on in the reliquary that fused their individual personalities into historic airplanes like the Memphis Belle.
Standing before its wingless fuselage in the crowded restoration hangar of the National Museum of the United States Air Force, under its iconic nose art I see the crew of the Memphis Belle, men just past 20, bundled up in sheepskin and thick coveralls. They are, from left, Harold Loch, Cecil Scott, Robert Hanson, James Verinis, Robert Morgan, Charles Leighton, John Quinlan, Casmer Nastal, Vincent Evans, and Clarence Winchell.
Portrayed in an eponymous motion picture, Hollywood history has confused the significance of what these men achieved in the Memphis Belle. It was not the historic airplane before me that successfully flew 25 missions, it was the team that gave it life. Consistent through all the history of the era I’ve read, including The Man Who Flew the Memphis Belle, written by Robert Morgan and Ron Powers in 2001, daylight bombing early in the war endured an 80-percent casualty rate.
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Measuring Aviation Rewards: A Personal Hall of Fame
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Gathering with my aeronautical peers, I rarely participate in conversations in which they compare their cumulative and recent aviation rewards in terms of certificates and ratings earned, total hours logged, or most recent aircraft flown. While I share in the joy of their accomplishments—and sometimes envy them—I measure my aviation rewards by a different standard.
Like my peers, I share their overwhelming passion for flight. But making the most of available opportunity, circumstance, and individual interest, I’ve grown into an erudite aviator. The aviation rewards that I relish is association with others who have shared their more extensive knowledge and experience with me, and the opportunity to share what they have taught me with others.
Every aviator, I’m sure, has enshrined these notable individuals in his or her personal hall of fame. Mine was founded with the flight instructors who patiently conveyed the aeronautical knowledge and stick-and-rudder skills that realized my aviation dreams. Their names, Kim Middleton, Kerry Rowan, and Caroline Kalman, are unknown to most, but that does not diminish their contribution to those of us who were their students.
In select circles of aviation, some of my personal enshrinees are better known, like Loren Doughty and David Borrows, who demystified the complexity of helicopter flight by talking me through my first hand attempts at it. Dave Gwinn, Terry Blake, and Hal Shevers taught me different aspects of the business of aviation, and dedicated FAAers, who I’m sure wish to preserve their anonymity, took me behind the curtain of terminal and en route air traffic control, flight standards, and the nuances of flight test and aircraft certification.
In my mind there is a wing reserved for those who fostered my opportunities as an aviation word merchant. Gary Worden, Melissa Murphy, Dave Ewald, Pat Luebke, Jack Olcott, and Rob Mark not only taught me by example, they endured my trials and tribulations as I worked to achieve our common successes. Without them, I would not have been able to learn from so many others.
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Generations of Aviation Relevance
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On my inaugural visit to the National Museum of the United States Air Force, I expected nothing more than the opportunity to meet many of the airplanes I’ve read about in their tactile, three-dimensional magnificence. The museum, part of the National Aviation Heritage Area that encompasses Dayton, Ohio, and its surrounding communities, more than met my expectation. Unexpected was the epiphany that arose from an obscure airplane, a simple but vexing question, and the spirit of my father, a naval aviator who joined his World War II compatriots in 2008.
The Air Force Museum has divided its vast collection by conflict/era in four huge hangars: World War I, World War II, the Cold War, and the new hangar, which is open in the spring, which will display the collection’s experimental aircraft, such as the X-15. Walking in the World War II hangar with Paul Dye, editor of Kitplanes magazine, we came across the AT-9 and wondered who had given a Twin Beech an Art Deco makeover. Seeing the airplane in profile, I realized that I’d seen the airplane before, in two-dimensions. And thinking of the worn Aeronautics Aircraft Spotters Handbook, published by the National Aeronautics Council in 1943, resurrected my father’s spirit, for it was his NavCad book bag, and he used it to teach me to read words and airplanes.
Edited by Ensign L.C. Guthman, the handbook categorized the Allied and Axis aircraft of the era by number of engines, from six to gliders, and the position of their wings, high, mid-wing, and low. The AT-9, an advanced trainer, made by Curtiss-Wright, the nacelles of its two Lycoming R-680-9 radial engines extending beyond its Art Deco nose, is on page 134. Not far from what may well be the last tangible example of this little known airplane is the airplane on page 135, the Curtiss-Wright C-46 Commando.
As we wandered through the connecting hallway that led to the Cold War, Paul asked an often-posed question: Why has interest in the aircraft of World War II endured in their popularity compared to the veterans who flew during the conflicts waged during my lifetime, Korea and Vietnam? The kernel of one possible answer was planted when I noticed a heavily armed Predator drone flying above a heavily armed Skyraider that saw service in Southeast Asia.