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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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Boeing Flight Test Engineers Get Creative
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Test pilots and flight test engineers are an amazing and interesting group of people. But they are deadly serious about their work because focus and attention to detail preserves not only their lives, but those who go aloft in the aircraft they are testing. Some aspects of certification flight tests can be eternally boring. Tests for function and reliability and extended ops, or ETOPS, for example, can involve flights lasting 15 hours or more.
My only experience with long duration flight was the 17-hour confinement, not counting the Alaskan fuel stop, in a stretch DC-8 with max density seating. It carried me, and the hefty Air Force and Army sergeants on my left and right, to Asia in 1975. Aside from better, more comfortable seats, I can’t imagine the willpower it takes to focus on precisely flying the data points and monitoring the data.
Then I found Randy’s Journal, that’s Randy Tinseth, VP of marketing for Boeing Commercial Airplane. How much fun would it be to use a 747-8 Freighter to scribe on a FlightAware map a “747” that covered 15 states stretching east from Washington to Wisconsin and south to California, New Mexico, and Texas? From Paine Field, the 17-hour function and reliability test flight had to go somewhere, so why not have fun with it?
Not to be outdone, the flight test crew of the 747-8 Intercontinental had an 18-hour ETOPS test flight to plan, and they figured it would be just enough time to fly over every one of the lower 48 states. This time they tracked their route on a Google Earth map. The test “helps determine how far the airplane will be able to travel from a suitable diversion airport,” Randy wrote, adding, “After the Intercontinental returned to Everett, it still had more than two and a half hours worth of fuel left.”
And to fill the downtime on that flight, one of the flight test analysis engineers walked a half-marathon. “In 15 minute increments, she circled a 225 foot loop around the aft section of the airplane—310 times.” Oh, what I would not have given for that opportunity back in the day. — Scott Spangler
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Fear of Flying: How GA Pilots can Lessen the Impact
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By Douglas Boyd Ph.D
One of every six adult Americans is afraid to fly according to the Journal of Travel Research. Frightened folks — who BTW cross all socio-economic lines — take 66% fewer commercial airline trips than those who enjoy time aloft. Interestingly, this heightened anxiety is despite an excellent airline safety record in developed countries with no fatalities on US carriers in 3 out of 4 years (2007-2010).
The impact of these anxiety-induced flyers on lost airline and charter revenue, calculated at $1.6 billion, is considerable. Perhaps, the extent of the problem is best illustrated by the 50,000 graduates of the British Airways Flying with Confidence program over its 25-year history.
I think we need to get these folks flying! Here’s how pilots can help.
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Biz Jets Merely a Pawn in Wealth Wars
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With her saucy style, Gail Collins is one of my favorite New York Times Op-Ed authors. This week she wrote about “The Best Perk in Politics.” Naturally, she’s talking about business jets and all the free rides Rick Perry took on them. After a fleeting aero-centric thought of how the industry would defend itself against the latest attack, I cogitated on conflict’s root causes and supporting players.
First, biz jets are a pawn in our political, social, and financial debates because they are an immediately understood symbol that separates those with the power and influence money buys from everyone else. Yes, as a member of the aviation clan I fully understand and support all the good business aviation provides, and the livelihoods it supports. But these boring realities are lost in the wordy gale of accusations and counter claims.
Collins succinctly described why biz jets are the ideal symbol in the wealth wars. “And you have to admit: private jets are the best. When you get to the airport, they’re waiting for you. You can keep your shoes on. Nobody tells you to turn off your Kindle until the plane has reached cruising altitude. It’s the one rich-person perk I truly, desperately envy.”
She and the millions of people subjected to the TSA security show who must also endure the airlines’ crass treatment and pocket-picking fees. A spurious question: Do rich and powerful airline execs have biz jets, or do they fly coach like their paying customers?
Still, being an envied yet despised symbol is not good for aviation and the people who make their livings from it. But, realistically, biz jets will forever be a symbol, a pawn in the wealth wars. As everyone knows, aerial corporate transport is but a tool, and how it is perceived depends on how their owners use them. Until this changes, business aviation will always be a topic for op-ed authors and others. — Scott Spangler