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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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Pilots Flock to Stick & Rudder Safety Clinic
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It’s been awhile since I’ve attended an FAA safety seminar. With good intentions I read all e-mail invitations FAASafety.gov sends, but other weekend responsibilities too often take precedence. A tailwheel clinic, on the other hand, is more important than cutting the grass, especially when it’s held in a place where airplanes are born.
Located on the Rochester, Wisconsin, airport, the American Champion Aircraft (ACA) factory wasn’t hard to find. In the main assembly hangar several dozen people, many wearing their best aviation T-shirts, milled around the tables where the Rochester Library Association sold coffee Grande and high-octane pastries for $1 each. Based on the safety clinics I’d attended in the past, the crowd seemed average.
Nearby, a High Country Explorer guarded a sea of 200 empty chairs that faced a large screen standing before a yellow Scout on tall Tundra Tires. Rather optimistic attendance hopes, I thought, given that taildragger pilots are a minority among aviators.
Then an amplified voice echoed through the hangar. “Let’s get started,” said Jeff Taylor of the Wisconsin Bureau of Aeronautics. Those with coffee and donuts got the best seats. Right behind them were the pilots who had been exploring the CNC mills and towering racks of aluminum and steel airplane parts. At 9 a.m., it was hard to find an empty chair.
What’s going on here?
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United and Continental Airlines: Dumb and Dumber
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As a marketing-communications guy, JD Power and Associates recent labeling of Continental Airlines as one of the best in the nation for overall customer satisfaction, as well as the Best U.S. Airline award CAL also grabbed from the Official Airline Guide crowd was pretty darned impressive. It’s the kind of brand recognition marketing people live for. And Continental has surely slugged its way through enough bankruptcies to feel good about reaching this point in the aviation industry.
And it is precisely because of Continental’s strong brand that I think that airline’s CEO Larry Kellner and the board of directors at the Houston-based airline must have lost their minds when they decided to hook up with a bottom-feeder airline like United, an airline JD Power ranks at the bottom of the heap too.
If you missed this piece of recent high-level airline strategy, Continental plans to “cooperate extensively, [with United] linking their networks and services to create revenue opportunities, cost savings and other efficiencies.” Continental also withdrew from the Sky Team alliance ( KLM, Northwest, Delta, Aeroflot and a few more) to join the larger Star alliance with United and 19 other carriers (see reply below). A merger between the two carriers was ruled out a few months ago when Continental said, “No thanks,” to a United offer to marry up.
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Icon Aircraft Preaches to the Congregation (Finally!)
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Stand with me brothers and sisters of the air and remember June 11, 2008. On this day upstart Icon Aircraft left the cloistered alcove where the choir of aviators sings. It took the public pulpit, inhaled deeply, and sang in pure notes to the congregation of nonflyers–flying for fun is for you!
Yeah, I know. You’ve heard this hymn before. But never like this. In the cathedral of aviation this is different. So different that the glitzy LA debut of the A5, described as the “ultimate recreational vehicle,” caught the attention of publications like Forbes and Business Week.
And the Wall Street Journal summarized the difference succinctly in its article, “Start-Up Wants a New Audience to Take to the Air,” calling Icon’s marketing plans “a novel concept: a small, sleek propeller plane aimed at the same mass market that includes motorbikes, personal watercraft, and powerboats…affluent thrill-seekers — a group that already spends billions of dollars each year on trekking, white-water rafting, hang gliding, parasailing and similar adventure sports.”
The Icon A5 is an amphibious light-sport aircraft made of carbon fiber. But that is not what makes it special. Nor is it the A5’s folding wings and optional trailer, allowing owners to keep it at home like a boat. What makes it unique is that the sleek, sexy machine was designed for the consumer–not a pilot.