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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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Looking Up at the Sounds & Sights of Spring
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As aviators, the sky is where we’d rather be. While many factors conspire against the fulfillment of this desire, being attuned to and looking up at the inhabitants in the ocean of air above us sustains our connection to it, which is why spring is special, especially here in Wisconsin, where winter attenuates aeronautical activity.
Muted honking positional cues from high-flying formations over Omro begin the migration of Canada geese to the surrounding bodies of water, Oshkosh’s Lake Winnebago and Lake Butte des Morts and the rivers that feed them. They are vast armadas of aerial pathfinders easy to see. Locating the source of prehistoric clacks issued by his and her flights of returning sandhill cranes is more challenging, which makes visual contact more rewarding.
When the threat of hypothermia melts with the remaining snow, song birds serenade from naked limbed trees growing knobby with buds. Unseen mourning doves moan. Skyhawks, many of them flying classrooms for Fox Valley Tech’s aviation program pirouette in the practice area west of town. When they suddenly go silent, their flight path reveals a simulated engine failure or a stall of some variety.
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Air Mail Centennial is Opportunity for Grassroots Birth of National Park of the Air
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In less than a month in late 1911, the United Kingdom, France, Italy, and the United States each made their inaugural air mail flights. All of them were short distance experiments that led to regular delivery schedules along established routes. The US Post Office began regular air mail service between New York City and Washington, DC, on May 15, 1918. The centennial of this first flight could be an opportunity for the grassroots creation of an American National Park that would connect the far reaches of the nation, just as the Air Mail network did by the late 1920s.
As the map shows, the transcontinental route, which pretty much followed Interstate 80, connects New York City and San Francisco. The Contract Air Mail Routes that emanate from it reach into the heartland and connect cities and towns large and small. Each of them could be a part of the national park of the air. Once the original air mail airports (or those closest to them because the originals have been buried by progress), perhaps pilots could fly part or all of the Air Mail Heritage Trail in search of new places to have a hamburger. Following the routes on their GPS, perhaps they’d turn a circle or two over the surviving beacons and concrete arrows that pointed the way to the next stop.
To succeed, this long-term grassroots effort must be a collaborative effort that involves more than pilots. Members of local and county historical societies would lead the effort to research the locations and people who wrote aviation history of the century past. Students could make these people the subjects of their school work and perhaps hold candy bar fundraisers for the plaques and displays that would recognize their contributions. The chambers of commerce in each waypoint on every route could unite online for the mutual promotion of the Air Mail Heritage Trail as well as the attractions specific to their city or town. And aviation groups of all interests could build on this to connect the past with examples of how aviation today serves their community, their state, and the nation. — Scott Spangler, Editor
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Why U.S. Airmen Should be Grateful for the NTSB
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RSS FeedDear Reader / Listeners – You now have the option to listen to The Aviation Minute podcast or just read the script of the show below. If you receive Jetwhine via e-mail, you can click here to listen as well.
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Why U.S. Airmen Should be Grateful for the NTSB
Podcast Text — Last week’s crash in the French Alps raised a number of issues, like how the young pilot accused of the tragedy managed to keep his health issues hidden from his employer, how few airlines outside the US. bring another employee into the cockpit when one pilot must leave and of course how, or if, pilots can even be allowed to fly if they’re suffering from any mental health issues. There is one item that wasn’t mentioned though, at least not directly … the differences between how aircraft accidents like these are investigated here in the US versus other parts of the world.
In the United States, our National Transportation Safety Board has spoiled us, in a good way. The NTSB is, of course, an independent federal agency established outside the Dept. of Transportation and answering only to Congress. Since the NTSB was crated back in 1926, the agency and its predecessors have investigated some 132,000 aviation accidents.
But back to the Alps. The first comments about the Germanwings crash were released by French Prosecutors. The French BEA, their equivalent of our NTSB, was sent to the accident site, but have not been heard from.
In Europe and other parts of the world, prosecutors being first to the microphone are not all that unusual because their motives are different from ours. Here, the NTSB searched for a cause, with the hopes of preventing a similar incident. Elsewhere it doesn’t work quite the same. When a business jet crashed into a snowplow on takeoff from Moscow’s Vnukovo airport last year, the Russians quickly arrested the snowplow driver as well as the tower controllers.
Outside the US, aircraft accidents are often seen as criminal events first, hence the need to find the culprit. Prosecutors are more like cops to me. They want a bad guy and within a very short period of time following the Germanwings crash, they pinned it on the co-pilot.
But let me be clear … I’m not saying the co-pilot is not responsible for the accident. What I’m saying is that there is so much work yet to be done, so many more pieces of the crash to be investigated that I’m appalled at the direction the media coverage has taken. (more…)