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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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GOES Gives HD Weather With Little Latency
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Mother Nature’s springtime blizzard that dumped more than a foot of snow over an appetizer of freezing rain and ice encouraged me to spend the weekend indoors. Searching for some clue of how many more courses this banquet of wind and snow she would serve led me to the discovery of NOAA’s newest generation of weather satellites, GOES-R.
GOES is short for Geostationary Operational Environmental Satellite. When launched, the satellites are identified by letter, and GOES-R is not GOES-16, aka GOES East, because that is its geostationary perspective of the Western Hemisphere. GOES-S, the second of the four-satellite system that will provide a weather eye through 2036, reached its geostationary home at 22,300 miles above ground level in March 2018. GOES-17, aka GOES-West, is now undergoing testing and calibration, it will begin supplying imagery in May.
Compared to its predecessors, the new GOES collect three time more data, provide four times better resolution, and more than five times faster coverage (about every 30 seconds). Onboard is the first-ever geostationary lightning mapper; the GLM detects the flashes at the tops of clouds day and night and counts frequency, location, extent, and the total number of in-cloud and cloud-to-ground strikes, all critical cues to severe weather.
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New Non-Tower AC: Perfect Spring Tune-up
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Ah, springtime. Any day now it should finally stop snowing. As the snow melts, puddles, and sublimates from airport operation areas, airplanes will emerge from their T-hangar hibernations and start sniffing the sky on sunny weekends. In preparation for these first flights of 2018, on March 13, 2018, the FAA conveniently published the perfect spring tune-up for pilots, Advisory Circular 90-66B. Non-Towered Flight Operations.
This should be required reading for all pilots. According the the March 2018 Administrator’s Fact Book, the United States has 5,116 public-use airports. Only 521 of them have control towers. That makes all the rest non-towered. And non-towered is what the 254 airports with contract control towers become when their controllers call it an operational day. Add to this number the 14,168 private airports, and the reason pilots should refresh their data banks on non-tower ops should be clear.
The new AC does an excellent job of it, and the authors deserved high praise for their concise and clear prose. It starts with the title. What would be more clear and concise than Non-Towered Flight Operations? Or consider that the new AC replaces these two: AC 90-66A, Recommended Standard Traffic Patterns and Practices for Aeronautical Operating Control Towers, dated August 26, 1993; and AC 90-24F, Traffic Advisory Practices at Airports Without Operating Control Towers, dated May 21, 1990.
If I may be blunt, regardless of what you fly—jet, engine, bug smasher, glider, anything lighter-than-air, or yourself after leaving some winged confines—read this AC because it covers the operational and communication aspects of all of them at non-towered airports. If you’re feeling all smug about your aeronautical knowledge, draw me a picture of the recommended traffic pattern that safely combines any two aviation activities at a non-towered airport.
Then answer me this: Does the non-towered airport you call home (or visit often) combine two or more aviation activities? The two most common combinations are fixed-wing flyers with either gliders or sky divers. And often ultralights are part of the fixed-wing flyers. What’s their pattern look like? If you don’t know or are unsure, click the link at the head of this story. It’s not a long read, just 18 pages with the appendixes. Do it now, in the privacy of your own screen. I’ll never tell. — Scott Spangler, Editor
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The Surprising Death of DUATS
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Reading that the FAA will end its contract for the Direct User Access Terminal Service (DUATS) on May 16, 2018, caught me by surprise. The surprise was not that the FAA was not renewing its support of the service. The surprise was that it had already done so around the turn of the century. Clearly, I need learn to pay closer attention to such things.
DUATS was born in 1989, about the time Flight Training magazine arrived in the world, back when computers were the new and exciting frontier that ended landline calls to 1-800-WxBrief and waiting on hold for a briefer. There were two different contractors competing for the attention of pilots, and their advertising revenue was certainly welcomed by the new publication.
More exciting was the no-wait weather briefing and other services DUATS provided—at no charge! And with time, each iteration of the provider’s proprietary software that automatically downloaded the selected weather products expanded the menu of meteorological goodies on offer. To this day, when I hear the nostalgic sound of a dial-up modem making its connection, I think not of “You’ve got mail!” but “You’ve got flying weather!”
But as broadband and Wi-Fi supplanted dial up, Internet weather sources were easier to access, and there were so many to choose from! As my attention was diverted (distracted?) elsewhere, as often happens, what you don’t regularly see ceases to exist. And isn’t the same thing happening to websites that haven’t kept up and redesigned their sites to automatically format themselves to the device that displays them?
What is more heartwarming is that it seems what goes around comes around. Without digging too deeply in to a service comparison, it seems that the flight service (smart phone compatible) website—www.1800WxBrief.com—provides most, if not all of a pilot’s flight planning needs, and for free! Ultimately, technological progress seems to be a merry go round, but getting a good preflight briefing has never lost its important contribution to aviation safety. — Scott Spangler, Editor