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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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Emergency Do-Overs & Dynamic Learning
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A subscriber to the FAA Safety Team notices, I immediately open and read emails with “Emergency Notice” in the subject line. On Saturday, January 16, Emergency Notice NOTC 2101 said:
“The FAA has been made aware of an issue with an update to a navigation database that became effective on 14 January 2010. To date, the known affected models are: Honeywell Bendix/King KLN 35, KLN 88, KLN 89, KLN 89B, KLN 90, KLN 90B, KLN 94, KLX 100, KLX 135, KLX 135A, KLN 900.”
It provided a link to a Honeywell website for more information. It described the problem succinctly in bold red letters:
After production and distribution of the Cycle 1001 databases (effective date 14-Jan-2010), Honeywell was informed by our data supplier, Jeppesen, that the data file delivered to Honeywell contained incorrect Dynamic Magnetic Variations for all terminal and en route waypoint records. For that reason, it is imperative that the incorrect databases NOT be used for arrival, departure, or approach operations.
In other words, airplanes with avionics that use the affected database are grounded until pilots download and install the corrected replacement. Fortunately, correcting a database error is a lot easier and expedient than correcting the same error on paper charts. It’s a pain, for sure, but imagine the inconvenience if pilots had to wait for new charts?
Magnetic variation is a term familiar to all pilots, the result of incorrect data is clear, an increased chance of metal meeting something hard, with an unfortunate outcome. But what in the heck is Dynamic Magnetic Variation?
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Flying in Alaska is a Little Different
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It’s nice to be the editor of an aviation blog like Jetwhine.com because I’m lucky enough to connect with people from all parts of the globe, folks I would never have a chance to meet in my everyday life. A few weeks back, Josh Saul sent me a note about his blog, wondering if I might go take a look. I look at every blog anyone sends me to, but honestly few are worth very much, I’ve found. Josh’s is different and pleasantly so.
Josh is the editor of Bush Pilots at the Alaska Dispatch. His is a blog you’re going to want to spend a little time with because airplanes in Alaska mean something totally different than they do down here in the Lower 48. Bush Pilot is full of original stories and video from pilots in the 49th state. The still photography is astounding and the videos are creative and insightful if not doggone funny. Take a look at this one with a Beaver taking off from a truck. Only in Alaska. Or this interesting arrival into Seward. Have any white-knuckled tales or pictures from your Alaska flying? Email Josh at jsaul(at)alaskadispatch.com. Tell the folks at the Alaska Dispatch that the folks down in the nice warm Midwest said hi while you’re there.
Rob Mark, editor
Technorati tags: Alaska Dispatch Bush Pilots, Alaska Flying. Josh Saul, flight training, general aviation -
UND Plants Seed of No-Pilot Airliners
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Much has been made lately of the University of North Dakota’s new bachelor’s of science degree in aeronautics with a major in Unmanned Aircraft Systems Operations, taught at the Odegard School of Aerospace Sciences in Grand Forks.
UND is quick to point out that, right now, the military is the primary career opportunity for UAV pilots (see UAV Pilot Shortage & Military Intelligence), but let’s be honest, the no-pilot airliner is just around the corner.
The US Navy has been using the Category III Automatic Carrier Landing System for years. It’s so reliable Uncle Sam’s Yacht Club has reduced the number of cross deck pendants, from four to three, on its new nuclear bird farms, so the technology exists for demanding flight environments. It’s only a matter of time.