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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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Virtual Vacation & Warm Weather Plans
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On a sunny day when the wind speed is 10 times the single digit temperature, giving into web wanderlust beats the hypothermia that awaits outside. An interest in historic byways lead me to the National Park Service’s National Register Travel Itineraries.
Created in 1995, I learned, the register connected public and private destinations by interest area to highlight thousands of sites on the National Register of Historic Places. In 2003, as part of the Centennial of Flight celebration, they launched Aviation: From Sand Dunes to Sonic Booms, which has an international reach.
It lists more than a hundred aviation sites by category — from the Wright Brothers and Aviation Pioneers to Air Power, Modern Aviation, and Space — and by state. Naturally, it includes all the well-known sites, like Kitty Hawk, but it was the unexpected sites that caught my attention and led to a list of warm-weather plans, because now would not be the time to visit Attu Battlefield and U.S. Army and Navy Airfields in the Aleutians.
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Remembering Real Space Travel
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At a time when most people don’t give space travel a second thought, I wanted to share this short clip of the Apollo 11 flight – the first time a human – Neil Armstrong – set foot on the face of the Moon. It took place just over 40 years ago and was a very big deal to those of us back then as thousands of people worked together to make President Kennedy’s dream of putting a man on the Moon a reality. Their focus on a commitment, that ability to bring all these people together for a common purpose was something to behold.
As we enter another decade, ask your self whether we as Americans are as focused on anything so monumental as we were 40 years ago. We’re superb at taking partisan positions on just about everything today, but as the final flights of the Shuttle fleet quickly approach, where does space flight and the quest to look beyond our own planet for the answers to life’s questions fit into our national priorities?
I’ve had the pleasure of meeting a couple of the Apollo guys over the years. Even had lunch with Frank Borman and Jim Lovell a few years back. I still get all goose bumpy thinking about it. What’s going to do that for kids these days?
(Restored Apollo 11 footage – click to view)
Rob Mark, editor
Technorati tags: Apollo astronauts, Apollo 11, Space Shuttle, learning to fly, airlines, Space flight, Jim Lovell -
TSA and Bloggers Tied 1-1
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As if President Obama’s anger over the security leak that allowed a Nigerian man to nearly blow up a Delta Airlines flight inbound to Detroit on Christmas were not enough, the White House now needs to contend with a PR quagmire created entirely by the TSA. Two aviation bloggers were yesterday served with subpoenas demanding they release the name of the source they used to obtain a security document the Department of Homeland Security said should not have been made public.
This is sure to become a precedent setting confrontation between journalists/communicators and the administration.
We spoke to Runway Girl, Mary Kirby, a blogger and journalist who was right in the middle of the debacle.
Technorati tags: TSA, Department of Homeland Security, Mary Kirby, Runway Girl, Steve Frischling, Chris Elliott, airlines, blogging, aviation marketing, airline security, NWA 253