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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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Alaskan Bush Pilot’s Life and Death Decisions Saves Four Crash Victims
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A Piper Navajo Chieftain crashed just after takeoff Saturday into the icy waters off Kodiak Island Airport about 250 miles southwest of Anchorage.
Initial reports indicate the left nose baggage door on the aircraft opened up right after liftoff. Six people, including the pilot, were killed in the crash.
Miraculously however, four passengers survived the frigid 35 degree waters after being rescued by the pilot of a nearby floatplane, a de Havilland Beaver. Dean Andrew, owner of Andrew Airways based in the nearby town of Kodiak was just preparing for takeoff from the company’s maintenance base at Kodiak Airport at the time of the crash.
I don’t know Dean and have only spoken to him once briefly by phone on Monday night when I called to say thanks to a guy who was doing what all of us aviators would have done in a similar situation … turn a crisis into a chance for some to live. I have many hours in the left seat of a Navajo so this crash made a profound impact on me.
Andrew told me, “I haven’t slept much since Saturday although I did get a little more sleep last night. I keep going over this whole thing again and again in my mind wondering what else I should have done to help get those other people out.” Early reports say the Coast Guard needed almost two hours on site after the crash to extricate the victims from the wreckage.
I asked Dean Andrew what he remembered about the scene. “I heard the distress call on the tower frequency because I was just getting ready to takeoff myself,” he said. “After the crash, I flew just a few feet off the water to where the tower controller told me he’d seen the aircraft hit. I had to land downwind. The swells were pretty high since the wind must have been about 30 miles an hour. That’s when I saw two people standing waist deep in the water on a piece of wreckage.”
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Rudder, Rudder, Rudder!
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I was having a luncheon chat a few weeks ago with a lady pilot from Wichita when she mentioned she owned a Cessna 170 –
that’s an airplane with the extra wheel on the wrong end of the airplane to some. When I realized she was a serious taildragger pilot, I also told her that to a lot of us old instructors, a pilot who knows how to kick the rudders these days is a rare and valued individual.
To me, I’d have to say that some of my best days as an instructor came when I was working with students in Cessna 120s, 140s and 170s, as well as the Citabrias and Decathalons. In the DC-3 though, I was definitely the student, although the ability to handle a crosswind in that bird just required more leg muscles.
(Thanks to Terry Shepard for this excellent Cessna 170 photo)
Pilots any good at kicking rudders in a taildragger will find their skills quickly transfer to almost any kind other kind of airplane when the wind is howling.
So, with a 100 percent confidence level of knowing that taildragger pilots are better dealing with crosswinds than most pilots trained in traditional nosewheel airplanes, I offer you this great YouTube video about pilots trying to cope with crosswinds the easy way – in airplanes with nosewheels. It comes to us through a new aviation blog – Kicking Tin – with a little excellent French rock and roll from a group that should have called themselves the Crosswinds, but actually answer to the name Lambe an dro.
Technorati tags: pilots, flight training, Cessna, Bellanca, taildragger, crosswinds, airports, air travel, Kicking Tin, Lambe an dro -
Northwest to Become the Official Airline of the GOP … This is Some Sort of Joke, Right?
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You have to love the fact that the GOP supports business, even if it is mostly the Fortune 100s.
The Minneapolis Star Tribune today reported that the Grand Old Party announced Northwest Airlines as their choice to be the official airline for this summer’s GOP convention in the Twin Cities.
There was a fact the Star Tribune missed though.
There is NO other airline with enough service in and out of the Twin Cities to act as the official airline this summer except Northwest. At last count, Northwest controls about 80 percent percent of the traffic at MSP.
Of course, maybe United might try out to become a sort of GOP runner-up airline … if they can find enough crews to staff their airplanes that is.
Technorati tags: Northwest Airlines, GOP, Republican National Convention, United Airlines, Minneapolis Star Tribune, airline, pilots