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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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Unprofessional Airmanship Redefined
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Remember when we called those two Northwest Airlines pilots who missed Minneapolis a few years back unprofessional because they were playing on their laptops instead of flying? We poked fun at them of course and well, no one was hurt … except for the pride of these two supposed professional aviators. But maybe we should have been tougher.
We talk a lot about professionalism these days, mostly because us old guys think many of the younger folks coming up the line don’t understand the meaning of the word. Perhaps they don’t because we’ve never taken the time to explain it … literally. I guess most of us never thought we needed to, but now I’m convinced that there are pilots jumping into some pretty large airplanes that seem completely unaware of their role as professional aviators.
Case in point is the Air India A321 on a recent flight between Bangkok and Delhi in which the two pilots actually left the cockpit of the aircraft within moments of each other at FL330, leaving command of the airliner in the hands of two non-pilot flight attendants. The pilots were both out of the cockpit for almost 40 minutes before one of the young flight attendants turned off the autopilot inadvertently and sent the two licensed aviators scurrying back up front. The two pilots as well as the two flight attendants were later suspended from work for their actions. None of the passengers knew what had happened until they read it in the newspapers.
To call this act unsafe is utterly too simplistic.
Despite the fact that most aviation accidents today are caused by pilot error, we’ve apparently reached a new low in professional pilot stupidity. What could possibly possess two high-time pilots to think that getting up mid-flight and leaving the fate of the 166 aboard to the two female seat monitors who were not even pilots was OK? My guess is this was not the first stupid decision these two made and more importantly, professionalism has nothing to do with the size of the aircraft someone flies. (more…)
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Monday Morning Surprise at Flight Schools
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Wandering around Addison Airport, a busy Dallas-area reliever, one Monday morning in late April, I dropped in, unannounced, at the airport’s four flight schools. Given the day and hour, I assumed they wouldn’t be busy and would have time to talk. Surprise is an inadequate word to describe their bustling student activity, that they offered warm, sincere greetings when I walked through the door, and that they took time to talk, even when they learned that I wasn’t a prospective student but just curious.
Monarch Air runs a fleet of Garmin G1000-equipped Cessna 172s and a similarly-equipped flight training device. Touring the facility and ramp, the instructors were mostly in their 20s and the half-dozen students I saw ranged from an equal age to double it. Everyone seemed engrossed in their particular lessons, but the body language of both students and teachers spoke the loudest: they were serious, but having fun. Smiles and shining eyes don’t lie.
Similar environments and teaching activity awaited me at Airline Transport Professionals (or ATP) and American Flyers. Both offer professional and personal training, and both were in session during these two visits. The students I saw at ATP looked like they were somewhere on either side of 30, except for the guy in the school’s computer testing facility. A Piper Seminole was parked on the ramp, and I assumed the student I saw briefing with his instructor would soon slide into its left seat.
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Being There: UAV Crews & Combat Valor
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Bowing to pressure from military and veterans groups who clearly don’t understand the rigors of combat at the controls of armed drones, Secretary of Defense Chuck Hagel has replaced the proposed Distinguished Warfare Medal with a device that will be affixed to an existing award.
The award’s ranking relative to other military awards was part of the opponents’ complaints, but they revealed their true motivation when they called it the “Nintendo” medal. What matters most to them is “being there” in battle, and all they see are the drone pilots’ distant duty stations.
As the number of combatants suffering from post-traumatic stress syndrome increases, everyone should accept that the consequences of combat are more than physical. In this regard, remote pilots and their enlisted system operators share an intimate relationship with death unequaled, except by snipers, who also see the faces of their targets.