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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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AirVenture 2011: Memorable Waypoints
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Sitting on the front porch with my battered feet bared to a healing breeze, I celebrated the end of my 34th EAA AirVenture Oshkosh marathon. Delivering my second round of rehydration elixir, my wife joined me. Having made the trek herself, she knows that the seemingly countless waypoints of things to see and learn are overwhelming, and that each year is defined by those things that survive in memory on the day after it’s over.
First thing Monday morning I eagerly found a seat close to the stage at the FAA Safety Center for an update on the Next Generation Air Transportation system. In its place was a member of the FAA Safety Team from the Great Lakes Region talking about ATC communications. The FAA exhibit area was almost a ghost town. In most of the booths usually staffed by FAAers in that division was an empty chair and a laminated explanation:
Congressional authorization for several FAA programs expired at 12:01 a.m. on July 23. As a result, nearly 4,000 FAA employers are now furloughed without pay. Given these circumstances, we are restricting our participation at AirVenture this year.
The Administration is working with Congress to resolve this unfortunate situation, and we regret the hardship this situation may cause for our employees and our stakeholders, including the attendees at AirVenture.
We wish you a successful event and hope to see you next year under getter circumstances.
Hoping that this was not an omen of what I would find elsewhere on my AirVenture hike, I trudged north. Each successive waypoint restored my hope and interest in aviation’s future, and these are the standouts.
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Helicopters Make Their Mark at AirVenture
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Performing missions no other aircraft can accomplish, helicopters are a vital part of the aviation industry. But they are a minority among flying machines, so their presence is often overshadowed by their fixed-wing peers, especially when they gather in numbers, as they do every year at EAA AirVenture.
But the rotorheads made their presence known this year with the debut of the Helicopter Association International’s Heli-Center.
On the main drag that parallels the flight line, HAI’s unique 60-by-80-foot chalet has a covered balcony that offers an unparalleled view of the flight line and air show.
At a media reception dedicating the Heli-Center, HAI President Matthew Zuccaro addressed questions of why with why not? Plying the same airspace, helicopters are a contributing member of general and commercial aviation subject to the same regulations that affect all flying machines from ultralights to the latest transport category jetliners.
Achieving its goal of attracting public and pilot interest in rotary-wing flight, the chalet offers information for all levels of interest. The Kids Copter Corner was next to a desk where a flight instructor explained what it took to become a helo pilot or to add the rating to an existing certificate. In an alcove next to meeting rooms a big screen displayed a series of videos of civilian and military helicopters performing myriad missions. At in information kiosk in the center of the floor, people answered any and all questions relative to HAI and vertical flight. (more…)