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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.
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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Flying for Fun: Light Sport Aircraft
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OK, so maybe I am too curmudgeonly at times. I’ve decided it’s time to remember that flying is still fun, so right after New Years I’m headed to Sebring Regional Airport in Florida for the U.S. Sport Aviation Expo, the new annual trek for the Light Sport Aircraft set. The action begins on January 11th.
After I was invited, I realized I knew very little about LSAs other than oggling Cessna’s prototype from behind the ropes at this year’s AirVenture in Oshkosh. Essentially, the rules say an LSA can weigh no more than 1,320 lbs, must use only a single engine with fixed landing gear and fly no faster flat out than 138 mph or roughly 120 knots.
The show focuses not simply on traditional LSAs, but on ultralights and powered parachutes as well … whatever they are!
If you’ve flown any of these machines, tell me what to expect.
Are these more than simply snow-blower motors attached to small airplanes or what? I must admit that once I heard I could wave my arms in the wind while airborne the entire trip began to sound pretty awesome to me.
I’ll report from the Expo when I arrive.
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Comair Pilots: Will The Union Strike … Should They?
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The Comair Master Executive Council drew a line in the sand this week over a bankruptcy court’s approval to toss the pilot’s working agreement in the trash. If Comair management does throw out the contract, the pilots have promised a strike.
No threats, just a simple guarantee. No contract, no work.
If Comair management isn’t burning the midnight oil to avoid a work stoppage this holiday weekend, they should be. That Comair pilots voted 10 to 1 in favor of a strike should come as no surprise to anyone since these are many of the same pilots who shut the company down for three months in 2001.
Not surprisingly too, Comair management has threatened to pursue an injunction against the pilots for what it claims would be an illegal strike.
What seems to have gone unnoticed by aviation pundits, however, is just how often the strike word has been used in written and spoken rhetoric over the past year. (more…)
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UAL Pilots are Embarassing
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Some of you have been reading this blog for awhile and I thank you for that. Let me tell you right now that I’m about to contradict myself. It’s probably not the first nor last time for that, but it’s not the end of the world either.
A few weeks ago I lambasted management at United Airlines for missing an opportunity to engage UAL pilots and win at least a kernel of employee support before they awarded huge bonuses to senior managers.
Now in retaliation the pilots have formed a strike committee to warn United management they’re serious about wanting their share of the pie.
And you have to admit, United management almost seemed to be asking for it. (more…)