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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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In Aviation, Every Day is Labor Day
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Today is Labor Day here in the states, a national holiday devoted to the men and women on the front lines, people responsible for building the industrial infrastructure of the U.S. economy. Labor Day parade, Buffalo New York, 1900
Since aviation is one of the most highly unionized job sectors here, it seemed like a good day to look at where we might be headed.
Pilots – This is where most people think all the fighting began, with labor and management squaring off against one another for the past 75 years. The industry is cyclical and has never proven to be much of a profit center for shareholders, except at places like Southwest. And even that carrier’s growth has slowed significantly.
Now we’re entering a period where airline pilots will have the upper hand. While the shortage of cockpit crews has not yet slapped the majors as hard as it has the regionals, the day is coming (Louis Smith from FLTops.com wrote a poignant editorial about this in Aviation Week a few weeks back).
Pilots are angry, as is just about everyone in the industry these days. Over 100,000 total jobs have been lost in the airline industry since 9/11. Millions of dollars have been given back in wages and benefits by pilots, flight attendants and mechanics. (more…)
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Flight Instructors Carry an Awesome Responsibility
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Today’s an anniversary of sorts.
It was just over 30 years ago today that I told a student named Jeff something that kept him from becoming an accident statistic. It didn’t seem like such a big deal then, but it does now.
Looking back on this today made me think again about how important the responsibility of a flight instructor is and how seldom we appreciate their efforts.
During a VFR trip to the Bahamas in a Bellanca Viking, the engine quit while this young man – heck I was just a kid too – and a passenger were out over the water. Unable to restart the big 300-HP Continental engine, the airplane hit the water and sank within a few minutes, completely busting the myth that the Viking’s massive wooden wing would surely keep a BL-26 on top of the water if the two ever met.
This man and his passenger escaped and inflated the liferaft I’d insisted they carry on the trip from the U.S.
“And make sure you put the raft where you can reach it easily if you need it, “I told him. “It won’t do you any good if it’s sitting in the baggage compartment if you go in.”
He listened.
He and his young lady passenger were adrift on the raft near Eleuthera for two and a half days before they were found by the Coast Guard. With no food or water on board the raft, the two would not have survived long under that Caribbean sun. (more…)
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Only You Can Make Aviation a Better Career
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I was reading a flyer that the editors at Professional Pilot magazine sent out recently asking reader opinions about the qualities needed to succeed as a professional pilot.
Now the battle begins … stick and rudder skills, versus more practical weather knowledge, versus cutting edge business skills … blah, blah, blah.
To me, the most necessary skill to succeed as a professional pilot has little to do with the traditional left brain, right brain skills we all think of a pilot critical.
It’s about personality. (more…)