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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.
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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Wings Set Aviation Movie Standard in 1927
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Much has been made of the actors portraying naval aviators in Top Gun: Maverick being filmed in the aft seat of an F-18 Super Hornet to capture the sagging distortion of real-life g-forces. Compare that to the challenges faced by Charles “Buddy” Rogers who, in 1927, learned to fly so the camera operator, sitting backwards in the front cockpit of a World War I-era biplane, could capture him stick-and-ruddering his way through the dogfights choreographed for Wings. (And he kept flying and was a World War II Navy flight instructor.)
Wings was the last of the great silent movies and the first to win the Oscar for Best Picture at the inaugural Academy Awards in 1929. To recoup its $2 million cost ($33 in 2022 money), Paramount released it three times in three different years: The New York premiere in August 1927, in Los Angeles in January 1928, and across the United States in January 1929. Paramount released it a fourth time in 2012 with the restored original.
Available from several different sources, I recommend the DVD because it includes a special feature. To more fully appreciate this remarkable film, watch the special feature before the 144-minute restoration. While Rogers learned to fly for his role, the film’s director, William A. Wellman (right), and Richard Arlen, the other male lead, were already pilots. Wellman was a World War I pilot who saw no combat but earned the nickname of Wild Bill. Arlen flew with the Royal Canadian Flying Corps.
The drama focused on the two men, one rich, the other middle class, who were in love with the same woman, who was not Clara Bow, who had top billing. It introduced the world to Gary Cooper, whose first 90 seconds on film as a flying cadet who perished on a training flight flying figure eights, led to his star-crossed career. But the real star was Harry Perry, the cinematographer who figured out how to overcome the challenges of air-to-air movie making. And then there was the squad of “stunt pilots,” led by Rod Rogers. One of them, Hoyt Vandenburg, credited only in IMDb, taught Rogers to fly for Wings and went on to become the U.S. Air Force chief of staff from 1948 to 1953.
Vandenburg was a lieutenant stationed at Kelly Field in San Antonio, where Wellman filmed Wings with War Department support. Thomas-Morse MB-3s stood in for most of the good guys and Curtiss P-1 Hawks wore the Iron Crosses of the bad guys. More than 300 pilots participated in the aerial sequences, most of them active-duty Army aviators. And so did more than 3,500 soldiers from Fort Sam Houston (now part of Joint Base San Antonio), who recreated the epic Battle of Saint-Mihiel, on the five-acre training range it lent to the film. To prepare the battlefield, the army dug trenches and used the range for artillery training to give it an authentic shell-cratered surface.
Filming Wings took nine months, mostly because of the weather, specifically the lack of cumulus clouds that provided the necessary contrast and scale for the spectacular aerial footage. All the aviation films that have followed have been mere shadows of what Wings pioneered. And it might all have been lost, like the film’s originals negatives, had not Paramount found and restored a spare negative found in its vaults.
In 2012 Paramount released a meticulously restored hi-def version of the film on DVD and Blu-ray. They remastered and re-orchestrated the original score (remember, this is a silent movie). There’s also a pipe organ music option, which played around the nation’s smaller theaters. Skywalker Sound used archived audio tracks for the sound effects and the restorations includes the Handschiegl color process for the fires that consumed the aerial casualties. If you haven’t seen this masterpiece, treat yourself. You won’t regret it. — Scott Spangler, Editor
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Finding Fisk During AirVenture
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For an unincorporated community in the Town of Utica and Winnebago County, Fisk, Wisconsin, is without a doubt the most well-known small town in the world of aviation. Also known as Fisk Corners, its concise Wikipedia page explains its notoriety in three words: Fisk Approach Control.
As “a temporary FAA approach control facility guiding planes visually toward the active runways at Wittman Field during EAA AirVenture Oshkosh,” over the years millions have flown over Fisk, but few have ever found their way to the small white trailer on top of a hill on the way into the center of town.
In the shade of the trailer’s blue awning sit three pink-shirted FAA air traffic controllers, two scoping the sky to the south with binoculars and the man sitting between them talking almost nonstop to the pilots of the planes buzzing overhead.
It’s like the three of them are connected by some Vulcan mind meld. Both lookers are voicing instructions to the separate airplanes they have in view and the talker conveys them over the radio.
Establishing the arriving airplanes in a line at the proper speed and with the necessary separation is the goal. “RV up high, rock your wings. Piper, too fast, too high; lower your gear and flaps and come on down; there’s no one below you.” A fourth member of the team follows the Piper announces that its gear and flaps are in transit. “Good job listening,” says the first looker, and “Good job listening,” said the talker, “Welcome to Oshkosh.”
Another pink-shirted is talking to a husband and wife who found their ways to Fisk from Oshkosh. Eavesdropping on their conversation I learned that he was the facility supervisor who, along with an operation’s manager, spends the week at Fisk. Everyday starts at 0630 so the team of four controllers is ready to go when AirVenture opens for arrivals at 0700. Without any numbers, he said “it’s been a record year, and Sunday was a big day!”
Getting ready for the shift change at 1230, keeping his eyes on the sky and ears attuned to the lookers’ and talker’s steady flow of instructions, he works in answers to the visitors’ questions and prepares the charcoal grill so the incoming shift can prepare its lunch. All of the controllers seem to have developed multitasking to an impressive artform.
As AirVenture volunteers, during the week, each of the four-controller teams rotate among the four ATC facilities: Fisk Approach Control, the World’s Busiest Control Tower at Wittman Regional Airport, the temporary tower at Fond du Lac Airport (the closest divert field), and the two “Moo-Cows” (pink-shirt shorthand for mobile operating controller). Stationed on platforms adjacent to the runways, these pink shirts flag pilots on their way home into streams of arriving traffic.
With moderate winds this Thursday, controllers were using Runway’s 9/27 and 18/36 and their parallel taxiways as runways. The Moo-Cows work with a waivered hold-short line that’s closer to the active runway, so departing aircraft can safely and efficiently fill the open space in the arriving traffic flow. If something big is arriving, like the C-17 or the Boeings and Airbuses hulking over Boeing Plaza, Moo-Cows keep everyone at the everyday hold-short lines painted on the pavement, and the tower shuts-down arrivals to the parallels so the bigger arrivals have the necessary safety space.
When this situation arises, or like it did this Thursday, and the tower dedicates a runway or two to shortening the line of departing aircraft, it is up to Fisk to adjust the flow of arriving aircraft so they find their way to the arrival runways at a constant rate. When a runway is dedicated to departures, the lookers and talker barely have time to take a breath, but their tone of voices doesn’t change or resonate with any sense of stress. But when departure backlog has shrunk and is again ready for arrivals, the pink shirts can again take deep breaths between their instructions to follow the railroad tracks to Oshkosh. — Scott Spangler, Editor
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Egrett & Perlan 2, AirVenture’s High Flyers
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Attracted to unusual and unknown aircraft, I walked past the record-setting Airbus Perlan 2 stretching its 84-foot wingspan across AirVenture’s Boeing Plaza to find out what the large, white turboprop was and why its fuselage was a series of lumps and protrusions.
Grob built the composite G520/G520T Egrett in the late 1980s, when the US government wouldn’t sell the German government any U-2s, said Roberta Vasenden of Av Experts LLC, which own the airplane, and is based at North Texas Regional Airport, just outside of Dallas.
Like the U-2 and Perlan 2, the Egrett, with its 108.25-foot wingspan, is just a big glider, she said. Powered by a Garrett 1759-shp TPE-331-14F-801L derated to 750 shp so it will deliver full power at altitude, this airplane will carry a 2,000-payload to 50,000 feet and stay there for 8 hours. And that’s why it is the Perlan 2’s tow plane. (The duo did a demonstration during the air show.)
The Airbus Perlan 2 is optimized for flight at 50,000 feet and above, and the Egrett is the most efficient and expedient way to get it there, Vasenden said. With conventional tow planes, it would take hours for the glider to find a mountain wave to lift to 50,000 feet and more time for its pilots to find a stratospheric wave that would lift it toward its 90,000-foot goal.
During the 2018 season, Perlan 2 climbed to a record 76,124 feet on September 2, 2018, higher than the published altitude record set by the U-2, and the team hopes to reach 90,000 feet, which surpasses the SR-71’s published record altitude, in 2023.
The Perlan 2 isn’t the only record holder. Signs propped up against its right main gear leg listed the Egrett’s records for Class C-1c turboprops. In September 1988 it set records for absolute altitude and horizontal flight without a payload at 53,574 feet, and time to climb to 15,000 meters (49,213 feet). And in March 1994 it set a couple of absolute altitude records when it sustained an altitude of 51, 024 feet.
The name of the pilot who flew these records was given on the National Aeronautic Association certificate of record that recognized them, Einar Envoldson, who is the founder of the Perlan Project. Not only could the Egrett tow the Perlan 2 to its optimum starting altitude of 50,000 feet, its payload and equipment bays allowed for a reel to collect the towline after the glider let go of it. As the Egrett’s pilot said, “Having a towline flopping around at 50,000 feet is not good.”
Like the Perlan 2, the Egrett is pressurized, Vasenden said. “At 50,000 feet it maintains an 18,000-foot cabin.” The pilot does not need a pressure suit, but the aviator is masked with a pressure demand oxygen system. When not towing the Perlan, the Egrett is carrying all sorts of novel payloads and new technology to altitude.
Its newest effort is the Airbus UpNext Project. One aspect of it is Blue Condor, which will take modified Arcus-J jet sailplanes, one powered by hydrogen and the other by conventional kerosene, to 33,000 feet to analyze the contrails impact on the atmosphere. After release, the Egrett, packed with emission sensors and instrumentation provided by the DLR, Germany’s aerospace center, will follow in the glider’s contrail.
Basically, Vasenden said, the project will determine if the water vapor contrails produced by the hydrogen engine is good for the atmosphere. The tests are upcoming, she said, but in May the Egrett flew the sensors and related instruments, which have never been used before, so stay tuned. — Scott Spangler, Editor