-
Making the Brazilian ATR-72 Spin
by
[sc name=”post_comments” ][/sc]
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…)
-
How the FAA Let Remote Tower Technology Slip Right Through Its Fingers
by
[sc name=”post_comments” ][/sc]
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…)
-
Why U.S. Airmen Should be Grateful for the NTSB
by
[sc name=”post_comments” ][/sc]
Dear Reader / Listeners – You now have the option to listen to The Aviation Minute podcast or just read the script of the show below. If you receive Jetwhine via e-mail, you can click here to listen as well.
If you’re not yet a subscriber to The Aviation Minute, Click Here to sign up … it’s free.
__________________________
Why U.S. Airmen Should be Grateful for the NTSB
Podcast Text — Last week’s crash in the French Alps raised a number of issues, like how the young pilot accused of the tragedy managed to keep his health issues hidden from his employer, how few airlines outside the US. bring another employee into the cockpit when one pilot must leave and of course how, or if, pilots can even be allowed to fly if they’re suffering from any mental health issues. There is one item that wasn’t mentioned though, at least not directly … the differences between how aircraft accidents like these are investigated here in the US versus other parts of the world.
In the United States, our National Transportation Safety Board has spoiled us, in a good way. The NTSB is, of course, an independent federal agency established outside the Dept. of Transportation and answering only to Congress. Since the NTSB was crated back in 1926, the agency and its predecessors have investigated some 132,000 aviation accidents.
But back to the Alps. The first comments about the Germanwings crash were released by French Prosecutors. The French BEA, their equivalent of our NTSB, was sent to the accident site, but have not been heard from.
In Europe and other parts of the world, prosecutors being first to the microphone are not all that unusual because their motives are different from ours. Here, the NTSB searched for a cause, with the hopes of preventing a similar incident. Elsewhere it doesn’t work quite the same. When a business jet crashed into a snowplow on takeoff from Moscow’s Vnukovo airport last year, the Russians quickly arrested the snowplow driver as well as the tower controllers.
Outside the US, aircraft accidents are often seen as criminal events first, hence the need to find the culprit. Prosecutors are more like cops to me. They want a bad guy and within a very short period of time following the Germanwings crash, they pinned it on the co-pilot.
But let me be clear … I’m not saying the co-pilot is not responsible for the accident. What I’m saying is that there is so much work yet to be done, so many more pieces of the crash to be investigated that I’m appalled at the direction the media coverage has taken. (more…)
-
Pilot Reincarnation: What Bird Would You Be?
by
[sc name=”post_comments” ][/sc]
From time unrecorded, humans have looked up and envied the birds above them. In time we created machines to emulate their various forms of flight. But have you ever given a moments thought to pilot reincarnation and what kind of bird you would be?
I’m not sure why I awoke with this question in mind last Sunday morning, but it was good reason for not getting out of bed until I’d pondered it. Given the omphaloskepsistic (that’s Greek for contemplation of one’s navel as an aid to meditation) nature of my question, the philosophic seagull lifted off first. Following it was the peregrine falcon, the fast and agile fighter pilot of birds; the albatross, ungainly on the ground, but king of long distance soaring; and the owl, a stealthy predator known for silent flight.
Ultimately, I decided on the hummingbird. Unlike machines, it doesn’t seem to suffer the trade-off consequences necessary for flight fast and stationary. With only a muted hum of wings beating at 40 flaps a second, give or take, they magically appear at my backyard feeder. Better than any helicopter ever could, they dart left, right, forwards, backwards, up, and down with precision that any Blue Angel would die for.
And, as I’ve just learned, their precise flight is unaffected by turbulence measured with up to a 15-percent variation in wind speed. Imagine being able to adjust the angle of incidence of your wings independently with every flap, and it it at 40 flaps a second. It would be worth growing the tail that completes the physical structure that would reincarnate me as the ultimate flying creature.
So, pilots reincarnated, what bird would you be? — Scott Spangler, Editor
-
Another Big United Customer Service Failure
by
[sc name=”post_comments” ][/sc]
I’m glad I never worked in corporate communications for United Airlines, especially since the Continental merger. The calls from outraged customers and curious media types probably never end and it seems to me that United management really doesn’t care all that much what passengers have to say.
The following incident occurred aboard United flight 1061 March 16, on the way back to Chicago from Vegas. It really made me sick … not just this passenger’s story, but how the airline dealt with it. Cue the music … “United Breaks Guitars.”
First a bit of context, lest you think this is only some disgruntled employee’s fictional tale. I know the writer. In fact, Sean and I have know each other more than 20 years since I’m married to his wife’s sister. I’ve known Sean to be an honest guy and a hard worker, not to mention a loyal United flyer for nearly three decades. He really wants to like United.
So imagine you’re preparing to leave Las Vegas on an airplane jammed with business people and gambler party types, some probably fresh from the casinos as he was earlier this week. He was on the way back from a trade show in fact. This is where his words tell the story. (more…)