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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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The GAO’s Credibility on Aviation and ATC; Not Much, Who Cares
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Believe it or not, one of the tough parts of writing a good blog is knowing when to keep your mouth shut. And yes, I know there are a few readers who can’t imagine I ever
keep my mouth shut, but I really do.
Case in point. I had an opportunity to attend the American Association of Airport Executives (AAAE) general aviation issues conference last fall in Naples Florida. Pretty nice duty when you can get it I must admit.
The conference was designed to focus our attention for two days on general aviation. We almost never mentioned the airlines from what I remember. But there was one session that included a very nice lady – Faye Morrison – from the Government Accountability Office (GAO) who spoke to the issue of Very Light Jets (VLJ). I’ve always had a soft spot for the GAO because I honestly believed they act as a sort of watch-dog on the government and we all know they need it.
Although Morrison’s talk was relatively short, she did hold up this dandy GAO report she’d help build about the future of VLJs. It became clear pretty quickly though that her summary would suffice when she said the report essentially said … “VLJs, don’t know (what it all means) and it depends (what happens in the industry).” Gee was I excited to hear that kind of in-depth analysis for lord knows how many of our tax dollars. It seemed like a blog post made in heaven, but I decided to sit on it. I would have probably just written something sarcastic anyway so I let it go.
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Homebuilt Aircraft: How Much is More than Half?
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This seems like a simple question, and it is–unless you’re talking about an amateur-built experimental aircraft. Here the answer is critical because these aircraft are certificated under FAR 21.191(g), which requires “…the major portion [more than half, or 51 percent] of which has been fabricated and assembled by persons who undertook the construction project solely for their own education or recreation.”
Over the past half century homebuilts have gone from simple designs built from scratch to complex, sleek, high-performance, high flying composite kit airplanes with pressurization and turbine engines. Homebuilding was–and still is–the only affordable path to owning an airplane because the builder does the work. With the advent of kit aircraft, it has also become a way of getting comparable–or better–performance capabilities at roughly a third of the cost of store-bought aircraft. The popularity of both explain why homebuilts comprise nearly 15 percent of the single-engine GA fleet.
When builders turn a pile of raw materials into an airplane with a hacksaw, rivet gun, and torch, figuring out who built the major portion of the aircraft is simple. When builders complete a kit aircraft, where its manufacturer has done up to 49 percent of the work, and avail themselves of commercial assistance (paid help), calculating how much work each entity contributed to the finished aircraft is not so easy. Just ask the Amateur-built Aircraft Aviation Rulemaking Committee, chartered in July 2006 to recommend solutions to this problem and others related to it.
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The Global Need for Very Light Jet (VLJ) Best Training Practices
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Bob Barnes used to fly T-38s for the Air Force so the guy’s already one of my heroes. Turns out he and I served in the USAF around the same time during another war when we were both kids.
Today, Barnes focuses his love of flying on VLJs and how we’re going to be certain low-time, or low-turbine experience pilots don’t hurt themselves in these new birds … nor hurt anyone else for that matter.
He runs Robert B. Barnes, Aviation Safety and Training Specialists in Phoenix. A driving concern for Bob and other industry experts is that there are no succinct standards VLJ training suppliers must meet for new customers of the Cessna Mustang or the Eclipse 500. While both aircraft fall under the Technically Advanced Aircraft (TAA) label, training is covered right now by essentially no more than the FAA’s Practical Test Standards (PTS). That’s where Barnes comes in.