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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.
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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Zulu Time, Full Moon Madness, and Pilot Superstition
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Unless you’ve been a disconnected intraterrestial for the past week or so, you’ve probably seen the memes noting the triple one-week whammy of the change to daylight savings time (for those of you living in states subjected to it), a full moon, and a Friday the 13th. They all seem to be implications of bad times: the time change disturbance to our circadian rhythm, the full lunar reflection that seems to nurture humans to make bad decisions, and the stereotypical ill-fortune fate of triskaidekaphobics. It is all nonsense, of course, especially when you look on these events from a pilot’s point of view.
Zulu Time
The world could put an end to the circadian consequences of time changes and the confusion of calculating time zones when communicating live with someone who lives elsewhere. If English is the universal language of aviation, why not employ aviation’s time zone, set the world’s timepieces to 24-hour Universal Coordinated Time, and then leave it alone. If the world can’t agree that it is, truly, coordinated universal time, changes its designation back to Greenwich Mean Time or, my favorite for its cool word conciseness, Zulu time.
Before time zones, people set their clocks locally, starting at noon, when the sun reached its zenith over their community. Setting a schedule to these village clocks, each set to a different time as Helios made his daily trek from east to west, was more than a bit complicated, so the powers that be created time zones so people would not miss their trains. But compared to the airlines, hardly anyone travels by train any more, and because airliners can cross more than half of the world’s time zones in a single flight, setting their arrivals and departure times to Zulu seems to be working so far.
So why not the rest of the world? And it would give us some new songs to write, Instead of 9 to 5, the arbitrary span of an American workday, in today’s Central Daylight Time it would be 1300 to 0100. It doesn’t seem to have any clear poetic patters, but isn’t our uninterrupted circadian rhythms worth it? And pilots would receive an added benefit of no longer having to look at the local time and try to remember how many hours to add or subtract to fill out the flight plan form with Zulu time.
Full Moon Madness
Those in public and medical service will attest to the rise in decisions not thought through when the moon is full. The reason is simple, people can see better while acting under the delusion that their actions are less noticeable at night. That’s why the full moon has been known, since the evolution of load-lifting aircraft, as the bomber’s moon. And it is why the span of the full moon is the best time of the month to maintain a pilot’s night proficiency requirements.
Pilot Superstitions
Most of the pilots I’ve met and known are not superstitious, unless it comes to missing a step in their preflight preparation and planning, or getting distracted while working through a checklist. Decades ago, one of them warned me about flying an airplane that still had paint on its rudder pedals, but if he explained why, I don’t remember it. Can anyone help me out?
Seeking illumination on the internet, Hartzell Propeller blogged on four superstitions, but half of them, carrying talismans or lucky charms, seem stereotypical of all superstitious individuals. The other two were preflight rituals and weather-related superstitions. They didn’t get into specifics, other than one pilot’s preflight habit of dancing on the wing with an umbrella. I’d be willing to bet the other idiosyncratic behavior is related to something important they missed in preflight or operation.
But maybe I’m missing something here. If you have a pilot superstition, or know of one—and can explain what’s behind it—please let me know, and I’ll share them here. — Scott Spangler, Editor
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Researchers Seek IFR-rated Private & Airline Pilots for Study of GA Flying Activity
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Embry Riddle Aeronautical University researchers are asking INSTRUMENT-rated PRIVATE pilots and AIRLINE pilots to complete a 2-5 minute questionnaire (https://www.surveymonkey.com/r/GK3ZD3B) as to the amount/type of NON-revenue flying in light aircraft undertaken by them. Such information, combined with light aircraft accident data, could lead to improved general aviation safety for either, or both, groups of pilots.
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Learning Mission Control’s Backstory
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Wandering through Netflix’s streaming options hoping to trip over something that would hold my attention, in the Hidden Gems category I saw Mission Control: The Unsung Heroes of Apollo. Having visited the recently restored facility (See 87 Steps to the Moon: Journey to Mission Control Enriches Memories of Apollo 11), I pressed play. And I didn’t move or divert my eyes from the screen for the next 101 minutes.
What held me rapt was the unexpected story of mission control told by the men (and as several of the active duty female flight directors interviewed, “they were all men then”) who conceived the idea of mission control and worked long hours (with noted sacrifices to their families) to make it a critical component of not only the Apollo adventure, but all of America’s aerospace efforts that preceded it and grew from it.
It begins with Christopher Kraft, who explains Mission Controls genesis from the flight data collection effort on the X-1 project. It steps lightly through the Mercury and Gemini programs, which represent Mission Controls infancy and and adolescence, before one of Apollo’s flight directors, Gene Kranz, delves into its adulthood.
Many of the interviews are held in Mission Control itself, and through them the subjects share who sat where and their responsibilities. Meeting the men, in the white shirts with their skinny ties and ever-present cigarettes who sat unknown at their Mission Control consoles, was captivating. And before they spoke about their working lives, the film delved into where they came from and what ultimately led them to Mission Control.
There was Stephen Bales, who grew up in an Iowa farming community, earned a degree in aerospace engineering from Iowa State, and was the guidance officer during the lunar landing of Apollo 11. Among many others was Glynn Lunney, another Apollo flight director, and his contribution to the Apollo 13 effort subtlety emphasized the supportive teamwork of everyone who worked the shifts that covered every space flight around the clock.
The film delves deeper into the missions of Apollo 8, 11, and 13, with interview contributions from astronauts including Charlie Duke and Gene Cernan. But Jim Lovell had the best line when he talked about the delayed acquisition of signal (AOS, and the subjects do an excellent job of unobtrusively giving life to a seemingly endless stream of acronyms) on Apollo 13’s reentry. He might have been joking, but he said the crew decided to stay quiet for a bit. “It’ll make a great movie!” he concluded, laughing. Indeed! — Scott Spangler, Editor