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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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Pilot Transitions, Becoming Pluperfect
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As a word merchant focused on subjects aeronautical, people often ask if I am a pilot. Because a pilot certificate does not die (unless the holder surrenders or the FAA revokes it), my answer is always affirmative (pilot speak for you betcha!). Usually, the interrogation stops there because it is my turn to pose a question related to the word merchantly conversation I’m pursuing.
But sometimes my interlocuters persist. What do I fly? Almost anything that is currently airworthy that I can get into and apply full control inputs without bruising some part of my impeding anatomy (it’s a short list). Before they ask the next question, I explain that I am not now current. To once again fly as pilot in command I would need a current medical certificate and flight review. Call it pilot present and past tense.
Until recently, present and past tense described my relationship to the verb “to fly.” But a recent diagnosis of Parkinson’s Disease has put the possibility of a medical certificate in the realm of not worth the time, tests, money, and bureaucratic calisthenics necessary for a one-year special issuance medical. Closing the door on once again becoming a current, present tense pilot, calls for a new adjective, former, as in “having been previously.”
Pondering this transition, I realized that past perfect is the verb tense that talks about an action that was completed before some point in the past. It is also known as the pluperfect tense. Phonetically, my neurological affliction became Poppa Delta, and before he arrived, just before Covid-19 showed up, I used to fly as pilot in command. Without the possibility of once again exercising those privileges, I am now a pluperfect pilot.
Oh! The conversational possibilities this transition offers. Because I have not surrendered and the FAA has not revoked my pilot certificate, my answer to the primary question remains the same. Only those who persist will learn about Poppa Delta, the pluperfect pilot. This could be fun!
Some may wonder if this transition is a depressing downer? Absolutely not! Never having had the opportunity to become a pilot would be worse by an exponential degree. Now is the time to appreciate all the rewards that becoming a pilot has given me. It is time to recall warmly all of the once-in-a-lifetime adventures with heartfelt gratitude. And while I will never again be a current PIC, as long as I keep getting out of bed in the morning, being a pilot continue its rewards.
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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FAA Finally Delivers NextGen Fuel-Efficient OPD Approaches
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To reduce aircraft fuel consumption and reduce the aviation’s contribution to the CO2 saturated atmosphere, the FAA implemented 42 new Optimized Profile Descents that allow planes to make a low-power continuous descent from cruising altitude at the nation’s largest airports.
Compared to the traditional and typical stair-step or step-down descent from cruising altitude, the benefits are easily conveyed and understood. Coasting at idle uses less gas than adding power to level off at each lower altitude on the way to the airport.
In its announcement, the FAA estimates that for each group of descents used at an airport, aircraft will save an average of 2 million gallons of Jet-A and eliminate 40 million pounds of emissions by 2050. “That is equivalent to eliminating the fuel and emissions of 1,300 Boeing 737 flights from Atlanta to Dallas.”
Dallas-Fort Worth got its OPD in 2021, along with Fort Lauderdale-Hollywood International, Orlando International, Reid International and North Las Vegas, Port Columbus International, New Jersey’s Lakehurst Maxfield, Portland International, and other mid-sized airports. And the FAA will more OPD procedures in 2022.
These efficient procedures are, without argument, a good thing for everyone on the planet, but despite contrary to the announcement’s inference, Optimized Profile Descents are nothing new. As the agency noted in its announcement, the FAA has been developing OPD procedures since 2014, establishing them “in Atlanta, Charlotte, Cleveland, Denver, Detroit, Houston, Northern California, and Washington, D.C.”
And old timers might remember that OPDs, originally called continuous descent approaches, were one of the primary selling points when the FAA introduced its Next Generation Transportation System (NextGen) effort in, what was it, 2008?
All things considered, looking at all the necessary building blocks, all the operational aircraft and ATC equipment and procedures, including Performance Based Navigation, ADS-B, and the unseen infrastructure (like WAAS, for example) that make NextGen work, the introduction of OPDs could still be on the FAA’s to-do list.
Where OPDs stood on the FAA’s initial NextGen timeline really isn’t important now. What matters is that the FAA is carrying through on its NextGen promises for the benefit of all who travel through the air as well as all of us who breathe it.
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