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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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LSA or Part 23, Category Means Little to Operating Costs
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Commenting on my recent post, LSA Pilots Could Spoil a Good Thing, a JetWhine reader said operating costs were missing from the mix. While LSAs might be pricier than hoped, “they still run at far lower operating costs— making plane ownership far less expensive. On average, many LSAs burn 4 gph. Insurance is cheaper as well.”
This implies that light sport-aircraft have lower operating costs, which they do when compared to flying machines with more horsepower and seats. But the same is true with Part 23 airplanes and homebuilts, because the certification category has little do with operating costs or insurance.
Without getting into all the extenuating factors, a 100-hp engine, whether it’s a Continental O-200 in a Cessna 150 or a Rotax 912 in an LSA, is going to drink roughly 5 gph. This is a bargain when compared to something with a 300-hp engine, which needs a 15-gph petrochemical fix. But when comparing aircraft of equal power, the fuel costs are pretty much a wash.
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Death of an Another Airline
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Now that Aloha Airlines has closed its doors and parked its airplanes for good, it seems like 1991 all over again to me. That’s the year the airline I worked for, Midway 1, shut down because of high fuel prices – at least they seemed high then – and some silly management decisions. Eastern and Pan Am fell silent around the same time.
Some 2,000 people lost their livelihoods in Hawaii yesterday when Aloha ceased service.
Here’s a photo a Jetwhine reader shot yesterday, probably one of the last of any of these old Boeing 737-200s flying I bet.
I can only say that I know what those Aloha employees are feeling … something akin to having been kicked hard in the stomach by someone you thought was a friend.
Everyone flying today should take a minute and think how their own lives would change if this happened to them. Maybe a better question is what can be done now, before your airline shuts down for good.
Aloha folks.
Rob Mark, editor
Technorati tags: Aloha Airlines, Midway Airlines, PanAm, Eastern Airlines, Air Travel, Airline pilots -
Aviation Blog Fest at AirVenture 2008
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Come July of this year, aviation bloggers will find it impossible not to answer the call to our Mecca for the first Aviation Blog Fest in history – I think.
In addition to a chance to hang out with many other very cool aviation bloggers and readers from around the globe, we’ll kick back and have some airplane fun since the fest just happens to take place during EAA’s AirVenture 2008 in Oshkosh Wisconsin. Airventure begins Monday July 28th and runs through Sunday August 3rd.
Imagine the fun of slogging down a cold drink under a blistering Wisconsin summer sun while you listen to aviation aficionados talk about everything and nothing all at the same time. We’re going to have a few very special guests join us, so keep that week open.
As the date draws closer we’ll firm up the times and specific locations on the Wittman Airport grounds. Right now, the EAA folks have not yet confirmed the time slot for the actual forum on the grounds, but I know we’ll certainly be having a Aviation Blog Fest barbecue courtesy of Jetwhine and a few additional sponsors.
I’m still in the market for a volunteer or two to help me keep things organized, so if you want to lend a hand, chime in.
But if it were me, I’d send a private e-mail volunteering for Aviation Blog Fest 2008. Post a public note here and you’re name will never be forgotten, especially if you agree to furnish the charcoal and then come down with a sniffly cold at the last minute. Stretchers to the fest will be provided for those who need them.
No sir – Aviation Blog Fest 2008 is only for real bloggers, people unafraid to post on a moment’s notice. Imagine live blogging from the first airshow with photos. Now that would be a feat. Or how about telling the world about a Bob Hoover event as it’s happening. We’ll be podcasting too for those of you daring enough to watch.
Seriously, Aviation Blog Fest 2008 is open to anyone who has ever read or written a blog, or who just wants to find out what all the hoopla’s about.
July 28 to August 3, AirVenture and Aviation Blog Fest 2008.
Be there or be square! RSVPs as we get closer to summer, but mark those calendars. You won’t be able to sleep for weeks if you miss this incredible event.
PS – volunteers and donations of all kinds will cheerfully be accepted.
See you there.
Technorati tags: AirVenture 2008, EAA, pilots, blogging, bloggers, Aviation Blog Fest 2008, marketing communications, Jetwhine, Wittman Regional Airport, Oshkosh Wisconsin