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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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Enola Gay’s Wendover Hangar On Top 11 List
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Aviation history is written by the triad of people, planes, and places, and news about any of the three always catches my attention. The National Trust for Historic Preservation recently published its 22nd annual list of the nation’s 11 Most Endangered Historic Places. On it is the hangar at the Wendover, Utah, airfield that protected the Enola Gay when the 509th’s Composite Squadron was practicing for its historic missions over Hiroshima and Nagasaki.
Waiting for the YouTube video tour to load (after shaking my head at its unchangeable headline error), my mind played the scene where a black and white Eleanor Parker, playing the wife of 509th commander Paul Tibbets and bundled up in sheepskin flight gear, collects frozen sheets from her Wendover clothesline in the 1952 film, Above & Beyond. At the same time I kicked myself for not making the short detour from Interstate 80 on my cross-country motorcycle trip in 1974. But it was August, very hot, and I was sure I’d pass that way again. But unless action is taken soon, I’ll have to settle for two out of three, person and plane.
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Regional Airlines: Are Pilots Qualified?
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The NTSB meets this week to ask the tough questions about February’s Dash 8 crash in Buffalo. They’ll be looking at icing effects on aircraft performance, cold weather operations, sterile cockpit rules, crew experience, fatigue management, and stall recovery training. The one that jumped out at me as an old regional airline pilot is the qualification issue.
A Jetwhine reader – Lou Smith from FLTops.com – recently sent me the transcript of Robert Sumwalt’s comments before the Regional Airline Association last fall in Washington. The gist of Sumwalt’s comments focused around whether the regional airline industry was and is doing all it can to maintain the one level of safety the FAA demanded many years ago when those regionals – then called commuters – were moved out of Part 135 to join the big guys in Part 121. Like Sumwalt, I don’t think regional airline pilots have quite made the leap to the safety level of major airline pilots, but based on their experience, not their abilities.
There has been a lot of talk since February about not just how the crew of the Dash 8 handled the ice, but whether or not they were seasoned enough to be flying in that weather in the first place. Sure to come up this week is not only that topic, but whether the regional airline industry has thought the crew qualification issue through, past the next flight that is.
Smith also sent me a BBC story that everyone should hear that asks how anyone in their right mind doesn’t see the correlation between the fatal injury rate on regional aircraft and the qualifications of the pilots flying them. You tell me whether or not you buy Regional Airline Association president Roger Cohen’s explanation of industry issues, especially when he was asked about the Flight Operations Quality Management System – a version of the Safety Management System business aviation is organizing – regional airlines have yet to implement, or the potential fatigue issues that surround the low pay for regional pilots. I didn’t.
Pretty scary when you learn that major airline pilots don’t want to use regional airplanes to commute to work when the weather is bad because they don’t trust the people in the cockpit.
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Business & ATPs Becoming GA’s Leaders
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Ever since I can remember personal flying has always represented the lion’s share of the general aviation fleet and hours flown, measured by the FAA’s annual GA and Part 135 survey. The most current data is for 2007, well before the economy reached full meltdown, and it suggests trends that are puzzling in their contradictions: a growing fleet of personal-use aircraft that is flying less and a shrinking business fleet that’s flying more.
We’re talking mostly about piston airplanes, the majority of them single-engine. When the FAA sends its annual survey forms to US aircraft owners, they check the box that best describes the airplane’s primary use. Between 1996 and 2007, the number who checked “personal” grew by 25 percent, from 113.4 K to 152.5 K. It reached this level in a few giant steps: 115 K in 1997, 124.3 K in 1998, 124.3 K in 1998, and 147.1 K in 1999. From there it meandered down to its current level.
Over the same period, the flight hours in the personal category fell 4 percent, from 9.03 million in 1996 to 8.68 million in 2007. The biggest change again occurs between 1998 and 1999, when personal hours jumped from 9.78 million to 11.07 million, peaked at 11.47 million in 2000, and then started a gradual decline. By themselves, the hours don’t look bad–until you divide them by the growing personal fleet. This shows a 40 percent decline in a fairly straight line. In 1996, the 113.4 K airplanes each flew 79.69 hours. In 2007, 152.5 K aircraft each flew 56.89 hours.
Generically, flying you can write off as a tax deduction (or get reimbursed for from your employer) counts as business flying. Over this 10-year span this fleet shrank 22 percent, almost as much as the personal fleet grew. Again, 1998-99 was the pivotal transition, when this fleet went from 32.6 K to 24.5 K. By themselves, business hours fell 5 percent, from 3.26 million in 1996 to 3.09 million in 2007, but the per aircraft total increased, from 106 to 124 hours a year.