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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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At Midway Airport, 15 Seconds Seems Like Eternity
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It was snowing the other night when I arrived back at Chicago Midway from Washington DC on AirTran. The cabin was about as noisy as you might expect for a 9 PM arrival, people talking, a few reading lights blazing through the darkness.
I knew something however, that I doubted most of the other people realized. Tonight was just a day short of the two-year anniversary of the night a Southwest Airlines Boeing slid off the end of 31 Center at MDW on landing.
What I had always found simply mind boggling during the the various testimonies and even while reading the NTSB report of the accident later was the time delay in getting the thrust reversers – the buckets we call them – deployed to slow the Boeing.
The report said it took about 15 seconds from touchdown until the reversers opened. Anyone reading the report will figure out pretty quickly that all was not well in the cockpit that night. Whether is was the autobraking system or the reversers that did not work properly is tough to know for certain.
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Senator Durbin & Air Traffic Controllers to FAA … Hello!
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Now that Senator Dick Durbin (D)IL has demanded action from the U.S. Department of Transportation’s Inspector General we can only hope acting FAA administrator Bobby Sturgell is listening.
The problem at hand is not really a tough one and is something I talked about with then NATCA VP Ruth Marlin for a magazine story two years ago.
(U.S. Senator Dick Durbin)
FAA plans for having enough trained bodies in the right ATC facilities at the right time simply didn’t then and still doesn’t have much to do with the reality of the air traffic situation at hand. (more…)
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Shooting Cessna in the Foot
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It’s been quite a busy few weeks for the webmaster at the Cessna Skycatcher blog since the Textron subsidiary announced its plan to assemble the C-162 in China. The blog has been the landing site for a number of heated comments poking hard at Cessna for doing business with the Chinese. One fellow called the company a bunch of Communists while another simply said they’d never buy another Cessna product (Cessna is a sponsor of Jetwhine BTW).
Cessna’s VP of Marketing Tom Aniello
went online to explain the company perspective and a few more positive comments have appeared – I wrote one myself – but what I find truly unbelievable is that no one seems to be talking about the impact of the Cessna decision on the sagging flight training industry. But then I have often found that when it comes time to marketing their services, the flight training industry is often its own worst enemy.