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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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A Glimmer of Light Ahead for the Aviation Industry
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For the thousands of us who call the aviation industry home, 2020 turned out to be a year we’ll be glad to see the end of although the change of calendars won’t wipe away many of this year’s problems. The highly-contagious coronavirus wreaking havoc on our planet stuck its ugly tentacles into nearly every aspect of life on Earth this year. The result has been people fleeing airline travel and anything related in unprecedented numbers. Airlines around the globe reacted by parking thousands of airplanes and furloughing employees as demand dropped to rock bottom levels. Thousands of others lost their jobs as commercial aircraft production nearly ground to a halt with the fallout moving downstream tearing the hearts out of many industry suppliers as it went. And all this in addition to the grounding of Boeing’s 737 Max back in March of 2019.
The much hoped-for follow-on aid from the US government recommended by economists on both sides of the aisle never materialized once paycheck protection funding ran out. Except for the stock market, the US economy sank into the worst recession since the Great Depression with food banks overwhelmed by the millions of other Americans out of work. Congress, at each other’s throats most of this year failed to be of much help. First-line health care workers, noble enough to risk their lives to help back in March, are now exhausted with no relief in sight.
Within a few months of the virus’ emergence, the commercial airlines made their best efforts to trim transmission by demanding everyone who did fly should wear a mask. The FAA decided such a rule was beyond the scope of their mandate. Interestingly hundreds of people have been permanently banned from some US airlines for refusing to don a mask claiming their right to personal freedom trumped any airline or public health demands.
Business and general aviation picked up some of the travel slack this year as people wealthy enough to use private aviation switched to a sector where they had better control over the potential transmission of a virus that is currently killing between 1,500 and 2,000 Americans each and every day. But without a permanent solution, like a vaccine, or something to absolutely convince people it’s once again safe to climb onboard a commercial airplane, the airlines and the rest of the industry are expected to spend years digging their way out of the billions of dollars in losses they’ve already experienced. (more…)
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Flight Operations in the CAR Era
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Many an aviation scribe has described what flying was like in now bygone days. Little did I suspect that the Civil Aeronautics Board was among them, or that Part 60 of the Civil Air Regulations (CAR), Air Traffic Rules, would paint such an effective word picture of what flight operations were like in the 1940s.
The modern offspring of these Air Traffic Rules for flight operations are today enumerated online in 14 CFR Part 91, General Operating and Flight Rules. It, at my count, contains 281 boldface sections in 14 capital letter subparts, A through N, the last of which is dedicated to the Mitsubishi MU-2B special training, experience, and operating requirements. I didn’t count the seven appendixes.
Printed on uncoated paper with the texture and weight of the durable copy paper we fed into manual typewriters in the basic news writing class at Missouri’s J-school, the Superintendent of Documents at the Government Printing Office sold the 10-page document, “Effective October 8, 1947,” for 10 cents. I found it, quarter-folded, in the back of my dad’s last logbook.
It was a quick read, with 29 flight operations regs in four sections: 2 General 60.00 rules; 14 General Flight Rules (GFR, 60.1); 4 Visual Flight Rules (VFR, 60.2); and 9 Instrument Flight Rules (IFR, 60.3). I started in section 60.9, Definitions. Most of them would fit comfortably with today’s CFR 1.1. A number of them were, however, a necessary to understand yesterday’s airspace.
60.913 said a Control Area is “airspace of defined dimensions, designated by the Administrator, extending upwards from an altitude of 700 feet above the surface, within which air traffic control is exercised.” I knew what a control zone was because airports still had them when I learned to fly in 1976. And that was it for airspace. Either you were in it, or you were not, and when you were in it, you followed the ATC instructions.
60.905, Airspace Restrictions, is another example of how flying used to be so much simpler and more enjoyable. Part 60 defines just two types of restricted airspace. “(a) Airspace reservation. An area established by Executive order of the President of the United States or by and State of the United States.” And “(b) Danger Area. An area designated by the Administrator within which an invisible hazard to aircraft in flight exists.”
VFR weather minimums and cruising altitudes is where Part 60 gets interesting.
At above ground level altitudes of more than 700 feet, pilots needed 3 miles visibility in control areas and control zones, and 1 mile everywhere else. In all airspace they needed to be 500 feet vertically and 2,000 feet horizontally from clouds. The same cloud clearances apply below 700 feet in control zones, and pilots still needed 3 miles visibility. “Control areas do not extend below 700 feet above the surface. Therefore the “elsewhere’ minimums apply.” Elsewhere, below 700 feet, pilots had to remain clear of clouds and have at least 1 mile visibility.
Cruising altitudes, in 1947, were divided not into two hemispheres, east or west, but quarters! When flying a heading of 360° to 089°, pilots flew at odd thousands of feet, 1,000, 3,000, etc. Between 090° and 179°, they flew odd thousands plus 500 feet, 1,500, 3,500, etc. Continuing around the compass, from 180° to 269° they cruised at even thousands, 2,000, 4,000, etc. And from 270° to 359° they flew at, you guessed it, even thousands plus 500 feet.
Finally, when cruising IFR, 60305, Right-side traffic, required “aircraft operating along a civil airway” to fly to the right side of that airway’s centerline, “unless otherwise authorized by air traffic control.” The reason, I’m guessing, is for the same reason the Strategic Lateral Offset Procedure (SLOP) is always on the right-side of the trans-oceanic routes. The more things change, the more they stay the same. Scott Spangler, Editor