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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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Will Only the Boutique Airframers Survive?
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Not a day goes by, it seems, when the aviation e-news organizations don’t report that another general aviation airframe manufacturer has reduced its work force and cut or ceased production to get through the globally self-inflicted economic meltdown.
What happens next for these aviation household names depends on how long the financial crisis lasts, and how messy it gets. Events over the past year suggest some will merge and others will fail. In November 2007 Cessna bought the composite Columbia line for what must be way less than the cost of seeing its rarely mentioned Next Generation Piston airplane through to certification. Since then Adam Aircraft closed its doors and Eclipse’s ongoing problems started making the news.
This turn of events doesn’t surprise me because these companies, Adam, Cessna, Cirrus, Eclipse, Hawker Beech, Mooney, Piper, and others like them compete with each other for a larger piece of a shrinking pie. With so many companies selling aircraft with essentially the same capabilities and performance, one doesn’t need a degree in economics to see the future of peddling these largely owner-flown aircraft to an aging and shrinking pilot population.
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TSA Large Aircraft Comment Period Begins
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By now, most aviators are aware of the TSA’s new focus on general aviation security now that they have slapped the airlines around enough over the past five or six years that is. I’ve always thought anything that is detrimental to any sector of the aviation industry, is bad for all of us in the end. That seems to have been proven out and apparently our turn is here. NPRM TSA – 2008 – 0021 is about to set the standard for how the government interacts with us as cockpit crewmembers, aviation department managers and passengers. And trust me, it’s not pretty.
Earl Lawrence, EAA’s vice president of industry and regulatory affairs wasted no time adding the association’s comments at the TSA web site calling for an extension to the comment period through March 31, 2009. Lawrence, on behalf of EAA said, “a major shift in the role of the Federal Government regarding the freedom of movement for private U.S. citizens. It would, for the first time, require governmental review and authority before a person could operate their own personal transportation conveyance. This significant intrusion into the lives of ordinary citizens and vast expansion of governmental authority must not be entered into lightly,” adding too that, “The rule appears to set significant precedents for the role government plays in the privacy of private citizens.”
Looking back on it now, I doubt the Air Transport Association ever thought airline security would evolve into the mess it eventually became for themselves and their customers, that TSA we’ve all come to know and love. If you want to be sure that general aviation doesn’t go the way of the airlines, take a few minutes to add your two cents. Here’s the link to the NPRM comment document. And in case you think your voice doesn’t count, take a look at yesterday’s election for a reminder.
Unlike the user fee debate, the next few weeks may be your only opportunity to voice dissent to the Department of Homeland Security. Remember when TFRs were an occasional happening? Too many of us have come to accept that airliners are safe when the President and Veep are around, but that all general aviation traffic must come to a grinding halt. Lawrence and EAA have spoken up very clearly. The end of this play has not yet be written. When it is, be sure your comments are part of the debate.
Don’t let this rule be plastered on aircraft over 12,500 lbs because trust me, aircraft under 12,500 lbs will be next. Click the link and send DHS your comments.
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ACA Fights Financial Fires With Aqua-Bama
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Airframe manufacturers are dealing with the financial fires spawned by the global economic meltdown in many ways, including reorganization, furloughs, and layoffs.
American Champion Aircraft is pursuing a different tact, introducing a new airplane. It’s a single-seat aerial fire fighter based on the 180-hp 8GCBC Scout. They call it the Aqua-Bama. Operating in the restricted category, it will deliver 100 gallons of water or Class A foam in 3.5 seconds.
Ideally, ACA says firefighting agencies could station fire-fighting squadrons around the state, Mehlhaff says: “four Aqua-Bamas, and a two-seat High Country Explorer for training and as a spotter.” For a company that makes less than 100 airplanes a year, an order for just one squadron would cool the heat of the current economic conflagration.
The prototype is flying on its way toward certification, and it’s already put out one real fire. ACA is situated just west of Rochester, Wisconsin, a village of 1,200 people 23 miles west of Racine.
“We were burning some pallets in our burn pit over by the gravel pit and we dumped some water on it,” says says Jerry Mehlhaff Jr., the company’s lead engineer. Depending on its altitude, Aqua-Bama has a trapezoidal dump pattern that’s about 90 to 100 feet wide tapering to around 50ish, and about 300 to 350 feet long. It quenched the pallets, Mehlhaff said, “and the guy working the fire said, Okay, I have to light that again.”