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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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Promote Aviation With Inclusive Participation
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Over the decades, the Young Eagles program has given millions of youngsters what, in many cases, were their inaugural flights in an aircraft smaller than a transport category airliner. This includes my kids and my grandchildren, which gives you an idea of how long pilots have been participating in the program. Unfortunately, its desired outcome—inspiring youth to become members of the pilot community—has not achieved the desired or hoped for magnitude.
Certainly, there are many factors contributing to the anemic number of Young Eagles who act on their inaugural inspiration. One I had not considered came to mind after reading about a new program in Washington that introduces a diverse cohort of newcomers to hot air ballooning. Unlike a Young Eagles flight, a passive, one-and-done experience akin to a theme park ride, the balloon program encourages the aeronauts to become volunteer members of the team necessary for every flight of a hot air aerostat.
Similar opportunities exist with gliders or sailplanes. Unlike powered aircraft, where a single person, usually the pilot, can prepare them for flight, gliders and balloons cannot fly without the contribution of others. Besides the pilot, gliders need at least two other people to take flight, someone to connect the tow rope and run with the wingtip in hand until the ailerons take effect, and another person to pull the tow rope, such as the tow-plane pilot or tow winch operator.
There are many more opportunities for hands-on participation on a balloon crew, which is always supervised by the pilot. A single person cannot wrestle the basket and propane fuel bottles in position. Nor can the pilot spread out the envelope, set up the fan to start inflating it, and operate the basket’s burners to heat that air, and then run to the top of the envelope to hold the rope that keeps the balloon from lifting off or drifting in the breeze. It takes a team, a group of individuals whose effort is repaid, over time, with a ride and, often, hands-on piloting experience.
Unlike gliders, aerostats go where the wind takes them, so the launch team is also the recovery team. Someone needs to drive the truck and trailer or van, someone else communicates with the pilot via radio, while others maintain visual contact with the balloon and do their best to translate its windborne flight to terrestrial roads and pathways. It really is an exciting challenge that encourages critical thought and problem solving. And it promotes appreciation of the efforts of every member of the team because they experience it from their own and the pilot’s airborne point of view.
Over the past four decades I have not yet encountered a balloonist or glider club that did not welcome visitors with open arms and invite them to join in the fun as a volunteer member of the team. And the situation is right, there’s often a ride upfront to set the hook. As participants in every aspect of the flight, from preflight briefing (and balloonists get into the nitty gritty in their weather briefings), it redefines ground school. If there is a downside, it is that the aeronauts often arise well before the sun to drift into the new day. But it has always been worth setting the alarm clock for the opportunity. The challenge is for powered aircraft pilots to create similar hands-on opportunities that encourage inclusive participation in the joy of flight.
If you enjoyed this story, why not SUBSCRIBE to JetWhine, if you haven’t already, and please share it with anyone who might find it interesting. — Scott Spangler, Editor
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Living Life by Pragmatic Absolutes
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Mentally treading water in Afghanistan’s déjà vu cesspool, I take little comfort in the images that bracket my office clock and remind me to live a life guided by pragmatic absolutes. In the right hand frame, some of my shipmates are pushing over the side two of the 29 South Vietnamese UH-1 Hueys the USS Blue Ridge (LCC-19) had to park in the ocean so the circling helos filled with refugees could escape the fallen city of Saigon in April 1975.
These images remind me one of life’s two absolutes—gravity. Its absolute partner is death. No one gets out of life alive.
In the left hand frame is US Ambassador Graham Martin. Arriving at o-dark-thirty, the admiral who was the task force commander guides him across the Blue Ridge’s flight deck. The ambassador is my poster boy for delusional hubris. While fighting for $750 million in continued support that he assured President Gerald Ford would finally turn the tide and save South Vietnam, he delayed many of the preparations that would have made for a smoother bug out from an ill-considered conflict.
Given the unyielding absolutes, I’ve lived a life guided by practicality rather than idealism, and never forget that we are ultimately responsible for the consequences of our decisions. Among the most important of these is learning from the mistakes of others, so we won’t have to convene our own learning experience by repeating them.
When faced with a decision, especially one of import, I look at this image of a man whose hubristic allusions of what he thought should be were visibly shattered by reality. After asking what he would have done before he landed on the Blue Ridge, I do the opposite. In other words, I strive for pragmatism, a philosophic doctrine that emphasizes facts and/or practical affairs, often to the exclusion of intellectual, emotional, or artistic matters.
The only thing worse is thinking you’re better than other mistake makers, clever enough not to repeat the errors they made, that you can outsmart the unimpeachable absolutes. No matter the situation or environment, each of us is responsible for the consequences of our decisions whether it’s bugging out of an ill-considered conflict or pushing the wind, weather, and fuel on a cross-country flight. You can point all the fingers you like, but gravity still wins and the pilot in command pays the price.
If you enjoyed this story, why not SUBSCRIBE to JetWhine, if you haven’t already, and please share it with anyone who might find it interesting. — Scott Spangler, Editor