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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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Researchers Seek IFR-rated Private & Airline Pilots for Study of GA Flying Activity
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Embry Riddle Aeronautical University researchers are asking INSTRUMENT-rated PRIVATE pilots and AIRLINE pilots to complete a 2-5 minute questionnaire (https://www.surveymonkey.com/r/GK3ZD3B) as to the amount/type of NON-revenue flying in light aircraft undertaken by them. Such information, combined with light aircraft accident data, could lead to improved general aviation safety for either, or both, groups of pilots.
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Learning Mission Control’s Backstory
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Wandering through Netflix’s streaming options hoping to trip over something that would hold my attention, in the Hidden Gems category I saw Mission Control: The Unsung Heroes of Apollo. Having visited the recently restored facility (See 87 Steps to the Moon: Journey to Mission Control Enriches Memories of Apollo 11), I pressed play. And I didn’t move or divert my eyes from the screen for the next 101 minutes.
What held me rapt was the unexpected story of mission control told by the men (and as several of the active duty female flight directors interviewed, “they were all men then”) who conceived the idea of mission control and worked long hours (with noted sacrifices to their families) to make it a critical component of not only the Apollo adventure, but all of America’s aerospace efforts that preceded it and grew from it.
It begins with Christopher Kraft, who explains Mission Controls genesis from the flight data collection effort on the X-1 project. It steps lightly through the Mercury and Gemini programs, which represent Mission Controls infancy and and adolescence, before one of Apollo’s flight directors, Gene Kranz, delves into its adulthood.
Many of the interviews are held in Mission Control itself, and through them the subjects share who sat where and their responsibilities. Meeting the men, in the white shirts with their skinny ties and ever-present cigarettes who sat unknown at their Mission Control consoles, was captivating. And before they spoke about their working lives, the film delved into where they came from and what ultimately led them to Mission Control.
There was Stephen Bales, who grew up in an Iowa farming community, earned a degree in aerospace engineering from Iowa State, and was the guidance officer during the lunar landing of Apollo 11. Among many others was Glynn Lunney, another Apollo flight director, and his contribution to the Apollo 13 effort subtlety emphasized the supportive teamwork of everyone who worked the shifts that covered every space flight around the clock.
The film delves deeper into the missions of Apollo 8, 11, and 13, with interview contributions from astronauts including Charlie Duke and Gene Cernan. But Jim Lovell had the best line when he talked about the delayed acquisition of signal (AOS, and the subjects do an excellent job of unobtrusively giving life to a seemingly endless stream of acronyms) on Apollo 13’s reentry. He might have been joking, but he said the crew decided to stay quiet for a bit. “It’ll make a great movie!” he concluded, laughing. Indeed! — Scott Spangler, Editor
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Race of Aces Looks Anew at World War II
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With the end of World War II lining up for its 75th anniversary celebration at EAA AirVenture Oshkosh, one might think there was little new information about the pilots who fought it. I was one of them, until I read the review of Race of Aces: WWII’s Elite Airmen and the Epic Battle to Become Master of the Sky, by John R. Bruning. (It should be no spoiler that I’ve already asked the library to add the 522-page tome published by Hachette Books to the its stacks.)
The reviewer, Elizabeth Wein, is no stranger to aviation’s preeminent conflict. She wrote A Thousand Sisters: The Historic Airwomen of the Soviet Union in World War II, which is a finalist for 2020 award for excellence in young adult nonfiction writing. Yet the names of the racing aces, Dick Bong, Tommy McGuire, Neel Kearby, Gerald Johnson, and Tom Lynch were new to her. Already well read on the exploits of these Fifth Air Force pilots, on whom the book focuses, I was ready to dismiss the new book as regurgitated history.
Fortunately, I kept reading. To improve morale, after Eddie Rickenbacker visited the far Pacific outpost in 1942, Gen. George Kenny challenged his pilots to surpass Rickenbacker’s World War I tally of 26 kills. “Rickenbacker and Kenny each agreed to stand the winning pilot a case of Scotch, and the race was on.” This I did not know, had never heard, and I want to know more (hence the library request for the book).
Almost every warbird geek knows that Dick Bong was America’s leading ace with 40 victories, so he should have won the Scotch. And I’m sure Race of Aces will go into details about their telling dogfights. That’s not what I’m interested in because I’ve already read some version of what the book will share. My interest is learning more about the pilots beyond their combat experiences, and the review promises this.
Saying that Bruning, the book’s author, “is at his best when he delves into the pilots’ anguish and obsessions.” And “his telling is based on a dragon’s hoard of primary source material, including well over 1,000 interviews he conducted himself.” Since so few of these noted pilots survived the war, I’m curious to learn what new perspectives these sources have to share because they give shape to the human forms that fight in any conflict. — Scott Spangler, Editor